Transregional Collaborative Research Centre TRR 33 The Dark ... - Heidelberg...

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Centre TRR 33Centre TRR 33 The Dark UniverseThe Dark Universe

 

 

Outline of Scientif ic ReportsOutl ine of Scientif ic Reports    

                                                                          © Keith Vanderlinde , South Pole Telescope    

FebruarFebruary 2009y 2009

Report December 2008Projects A1, C4

Node: Bonn

1. Joint Publications with other nodes

[1] S. G. Nibbelink, M. Trapletti and M. Walter, JHEP 0703 (2007) 035[arXiv:hep-th/0701227].Joint publication BonnC4/HeidelbergA4

[2] S. Groot Nibbelink, H. P. Nilles and M. Trapletti, Phys. Lett. B 652(2007) 124 [arXiv:hep-th/0703211].Joint publication BonnC4/HeidelbergA4

[3] S. G. Nibbelink, D. Klevers, F. Ploger, M. Trapletti and P. K. S. Vau-drevange, JHEP 0804 (2008) 060 [arXiv:0802.2809 [hep-th]].Joint publication BonnC4/HeidelbergA4

[4] A. P. Braun, A. Hebecker, C. Ludeling and R. Valandro, arXiv:0811.2416[hep-th].Joint publication BonnA1/HeidelbergA4

2. Joint conferences

DESY Theory workshop 2006

• H. P. Nilles (A1/C4) was chairman of the organizing committee

• participation by various people of many of the projects

Meeting in Heidelberg, November 2006

• participation of H. P. Nilles (A1,C4) and H. Dreiner (C4) and variousmembers of the groups

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Junior researchers meeting, Munich, Feb. 2007

• co-organization for the Bonn nodes by B. Poletanovic (C4) togetherwith J. Pielorz (B5)

TR meeting Bad Honnef, October 2007

• co-organizers F. Bertoldi (B7) and H. P. Nilles (A1/C4)

• participation of many people by (probably) all nodes

Bonn, TR33 theory meeting (with SFB Hamburg), Oct. 2007

• organized by H. P. Nilles (A1/C4)

• around 20 participants from (A1,A2,A3,A4,B2,C4)

Junior researchers meeting, Bonn, Oct. 2007

• co-organization for the Bonn nodes by B. Poletanovic (C4) togetherwith J. Pielorz (B5)

Passo del Tonale workshop, Dec. 2007

• participation by members of A1/C4

Spring meeting Bad Honnef, March 2008

• organized by Ivo Sachs (B2)

• lecture by H. P. Nilles, participation of all members of A1 and C4

TR meeting Leopoldina, Munich, October 2008

• talk by H. P. Nilles (A1/C4)

• participation of some members of A1/C4

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3. Networking with other nodes

• There have been strong interactions both with Heidelberg and Munichand there have been some joint publications with the Heidelberg nodeA4 (see above).

• C. Lüdeling from Heidelberg (A4) has now taken up a position in Bonn(C4) and this will strengthen the interaction between the groups.

• P. Vaudrevange from (C4) has taken up a position in Munich (A3)strengthening future interaction between the groups.

• Visitors from Munich at Bonn include among others Lüst, Stieberger,Haack, Krause (A3) and Mukhanov, Sachs (A2,B2).

• Vistors from Heidelberg include among others Hebecker, Groot Nibbe-link, Trapletti, Lüdeling, Valandro and Schwindt.

• Various members of the Bonn nodes have been invited to talks in Mu-nich and Heidelberg.

• There have been strong interactions (and joint publications) with otherpeople in Munich (TU, MPI) not yet involved directly in our TR33.

• Interactions with nodes in Heidelberg (A1,A4) and Munich (A2,A3,B2)have been instrumental for our work.

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Transregio33 “The Dark Universe”

Report December 2008Project A1, Hd-Bonn

Node: Heidelberg


add paper here if any with munich or bonn


add you name if you participated and say if organiser


• participation from Heidelberg of S. Stern, T. Dent (A1)


• participation from Heidelberg of S. Stern, T. Dent (A1).

TRR33 meeting Bad Honnef, October 2007

• participatio from Heidelberg if T. Dent (A1).• Talk: “Probing Fundamental ‘Constants’ with Big Bang Nucleosynthe-

sis” from T. Dent (A1).

Young researchers meeting, Bonn, Oct. 2007

• participation from Heidelberg of T Dent (A1).


• participation of C. Byrnes, T. Dent (A1).

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Young researchers meeting Heidelberg, Mar. 2008

• participation of C. Byrnes (A1).

TRR33 meeting Leopoldina, Munich, October 2008

• participation of C. Byrnes (A1).


• co-organization by C. Byrnes (A1).• participation of C. Byrnes (A1), N. Nunes (A1).

3. Networking with other nodes: visits and

exchanges

• ... T. Dent visited Munich LMU in May 2008 to give a seminar

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Report for the Projects A2 and B2 of the Transregional Collaborative ResearchCentre TRR 33 "The Dark Universe"

There has been intense collaboration between the projects A1, A2, and B2. Common publication appeared betweenA2 and B2. Below we describe the activities of A2 and B2 separately although these activities had substantial overlap.

I. A2: DARK ENERGY AND INFLATION

A. Anisotropic models

To describe the early time (inflation) or late time (dark energy) acceleration one often employs the use of scalarfields, which were never seen in the high energy experiments. To cure the problem Golovnev, Mukhanov and Vanchurinproposed a new model of inflation where the quasi de Sitter expansion is driven by vector fields [2], which, in contraryto scalar fields, have been excessively observed. Approximate isotropy of the expansion can be achieved by a triadof mutually orthogonal vector fields or by a large number of randomly oriented fields. The well-known problem ofslow-roll was resolved by non-minimal coupling of the vector fields to gravity.

From the point of view of the background evolution, the proposed model is very similar to the standard scalar fieldmodels (inflation or quintessence). However, in contrast to the scalar fields, the expansion with vector fields must notbe isotropic, which could lead to very distinct observational predictions. In fact, the current observational bounds onisotropy of inflation or dark energy are very weak and one can easily allow ∼ 10% of anisotropy. For example, thevector fields driven quasi de Sitter expansion with N ∼ 100 randomly oriented vector fields can give rise to anisotropyof the order of 1√

N∼ 10%. A somewhat closer look at the proposed scenarios had shown that some large fields models

are unstable due to tachyonic instabilities of gravitational waves [3], nevertheless the evolution at small values of thefields is generically stable to tensor perturbations of the metric.

B. Braneworld models

Minamitsuji and collaborators have investigated the Casimir effect in a particular class of six dimensional models,in which the underlying theory has scale invariance and the size of the internal space is not fixed classically [15, 16].The degree of freedom of the bulk volume appears in the effective theory on the brane. They showed that this volumeis stabilized by Casimir effect and at the same time the induced vacuum energy on the brane could explain the currentacceleration of our Universe.

C. Measure of eternal inflation

The existing measure prescriptions differ in their methods of introducing the cutoff and can be grouped into twoclasses. One class of measures completely ignores the growth of the volume and counts only the volume visible toa single randomly chosen world line. Measures of this class are called the worldline-based measures, in distinctionfrom the class of volume-based measures that attempt to sample the entire volume in the inflationary spacetime. Thedifferent methods of regularizing the infinite volume of an eternally inflating universe often give different results. Inthe absence of a mathematically unique cutoff on an infinite set of observers, one evaluates the competing prescriptionson their own merits. A measure prescription is discarded if it gives pathological results that are clearly in conflictwith observation.

One of the most promising volume-based measure was recently developed for the string theory motivated landscapemodels of eternal inflation. The basic idea of the stationary measure is to extract a gauge dependent factor for theoverall probability distribution by adjusting the “clocks” for different vacua. Vanchurin and collaborators (Linde andWinitzki) showed that the stationary measure leads to simple and gauge-invariant results [4] and suffers neither fromthe “Boltzmann brain” problem nor from the “youngness” paradox that makes some other measures predict a highCMB temperature at present. A satisfactory performance of the stationary measure in predicting the results of localexperiments, such as proton decay, was also demonstrated.

In another project Vanchurin had studied the worldline-based class of measures, which generically depend on theinitial conditions [5]. He constructed a fine-grained classification of the worldline-based measure proposals and showed

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that all of the measures suffer from the problem of choosing the right ensemble, which is directly related to the decisionproblems with imperfect recall in probability theory.

II. B2: K-ESSENCE AND ITS OBSERVATIONAL IMPRINTS

A. K-essence and causality

The cosmological scenarios with non-linear kinetic term (k-essence) can be used to explain the observed late-time acceleration of the universe. These scenarios avoid the need for fine-tuned initial conditions (the "coincidenceproblem") because of the attractor-like dynamics of the k-essence field φ. It was recently argued that the models ofk-essence with Lagrangian p = L(X)/φ2 lead to violations of causality. Vanchurin in collaboration with Kang andWinitzki carried out a comprehensive study of attractor-like cosmological solutions involving a k-essence scalar fieldφ and another matter component [1]. The result of this study is a complete classification of k-essence Lagrangiansthat admit asymptotically stable tracking solutions, among all Lagrangians of the form p = K(φ)L(X) . Using thisclassification, the class of models that describe the late-time acceleration and avoid the coincidence problem throughthe tracking mechanism was selected. It was proved that for the models which could address the coincidence problema superluminal epoch, where perturbations of φ propagate faster than light, must exist during the matter dominationepoch. In addition, it was shown that in the context of the k-essence cosmology, the superluminal epoch does notlead to causality violations, but could lead to unique observational predictions.

B. String field theory

String field theory is a second-quantized theory of strings. It naturally encodes higher derivatives in a consistentway, which makes it a particularly rich framework for studying string cosmology, and in particular k-essence scenarios.Closed string field theory is especially interesting in that respect because the graviton and dilaton are excitations of aclosed string. In [6], Moeller explored the nature of a non-perturbative vacuum of the closed bosonic string that wasfound from Moeller’s numerical evaluation of the closed string field theory action. While time-dependent solutions ofthe tachyon and dilaton rolling towards their non-perturbative vacuum suffer from wild oscillations (a problem alsopresent in rolling open string field theory solutions), a codimension one soliton was found. Very far from this soliton,the tachyon and dilaton fields are in their non-perturbative vacuum while they reach one of their perturbative vacuain the core of the soliton. It came first as a surprise, but was then understood on general grounds, that the dilatonvacuum expectation value is essentially constant in the direction transverse to the soliton. One consequence is thatthis soliton “selects” one particular dilaton vev (i.e. the string coupling constant) in the perturbative vacuum. Theflat profile of the dilaton also raises a puzzle because, from a study of a low-energy effective action, it has been arguedthat such a soliton should describe a spacetime with one less dimension. If this is the case, one would then expect tofind a linear dilaton profile.

Sachs and collaborators have proposed a way to implement non-tivial bulk (or gravitational) backgrounds in bound-ary string field theory [7] his provides a way to understand open string tachyon condensation in curved space-timewithin boundary string field theory as a particular realization of k-essence [8]. Concrete cosmological scenarios basedon open string tachyon condensation are presently under investigation by Kang, Moeller, Loewenfeld and Sachs.

III. ADDITIONAL RESEARCH ACTIVITIES

A. Cosmic strings

To study the statistical properties and dynamics of cosmic strings Vanchurin developed an exact cosmic stringsnetwork simulation. He showed that the small perturbations obey a scaling law described by universal power spectrum[9]. After a long transient regime, characterized by production of tiny loops at the scale of the initial conditions thetrue scaling regime takes over. In this final regime the characteristic length of loops scales linearly with time - insharp contrast to earlier simulations which found very small loops at the scales of the gravitational backreaction. Thenew scenario with large loop has very important cosmological implications. In particular, the nucleosynthesis boundbecomes Gµ . 10−7, much tighter than before.

To better understand the production of the loops of various sizes directly from infinite strings, Vanchurin developeda probabilistic analytical model [10], which allows one to estimate the spectrum of loops at arbitrary scale. For an

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exponential form of the spectrum of wiggles, there are two different scales corresponding to large (one order belowhorizon) and small (few orders below horizon) loops. The small loops are produced by large bursts of similar loopsmoving with very high velocities in the same direction and the large loops usually consist of few kinks and few cuspsper oscillation cycle.

B. Braneworld models

Minamitsuji and collaborators proposed a way of regularization of a codimension two brane by taking a finite branethickness into consideration [11, 12]. In his approach, a codimension two brane is replaced with a codimension onebrane wrapping around the axis of symmetry of the bulk. They showed that four-dimensional general relativity isrecovered in the large distance scales, solved the equation of motion of the brane into the static bulk and derivedthe effective Friedmann equation on the brane. Minamitsuji and Kobayashi also derived time-dependent braneworldsolutions in six-dimensional Einstein-Maxwell-dilation theory which describe the power-law inflationary Universe[13]. They also investigated the tensor perturbations and showed that the lowest Kaluza-Klein mode could surviveduring inflation. In addition, Minamitsuji analyzed the stability of these cosmological solutions against the scalarperturbations [14].

The final goal is to construct realistic brane cosmological models in higher dimensional space-time. In order to do so,one would consider regularization of branes with higher codimensions as in the six-dimensional models. But, in fact,it seems to be difficult to do so since these branes have stronger self-gravity and develop severe singularities. Recently,Minamitsuji has focused on the hybrid construction of the Kaluza-Klein (KK) and braneworld compactification, i.e.,to consider KK compactifications on the brane (called the Kaluza-Klein braneworld) [17].

IV. PRESENTATIONS AND OUTREACH

A. Outreach

Sachs has organised the XX workshop on Physics beyond the standard Model in 2008, a joint venture betweenTr-33, the Excellence cluster "Origin and Structure of the Universe", the SFB 676 "Particles, Strings and the EarlyUniverse" and the Virtual Institute for Particle Cosmology.

Sachs was co-organizer of 14th Saalburg Summer School in 2007 and 2008 and in particular organized the TR-33participation (Speakers Tr-33, Students, funding)

Sachs and Luest have co-organised a seminar on strings and fields since 2007 in Munich.

Moeller and Vanchurin have been organizing the weekly cosmology journal club. Each time, two or three recentpapers were discussed; their subjects were chosen so as to cover the broad and diverse interests of the group.

Moeller and Sachs, together with Mayr and Shatashvili, have organized a workshop on “String Field Theory andRelated Aspects” which took place at the Arnold-Sommerfeld-Center for Theoretical Physics of the LMU München,March 24-28, 2008.

Moeller has given a course on string field theory at the ASC, April 16 - July 17, 2008, starting from basics andgoing up to current research frontiers in the field, with applications to cosmology.

B. Presentations

Minamitsuji, Moeller and Vanchurin have attended and presented seminars at the following workshops:

1. Vitaly Vanchurin, “Exact cosmic string network simulations”,COSLAB 2006, Leiden, Netherlands, September 2006

2. Masato Minamitsuji, “Cosmological perturbations in Gauss-Bonnet braneworld cosmology””,Non-PI meeting of Transregio 33, Munich, Germany, February 2007

3. Masato Minamitsuji, “Casimir effects in rugby-ball type flux compactifications”,Recent developments in branes and cosmology workshop, Paris, France, March 2007.QFEXT 07, Leipzig, Germany, September 2007

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4. Vitaly Vanchurin, “Random observers in the landscape,”Thursday Cosmology Seminar, Tufts, USA, April 2007SITP Seminar, Stanford, USA, April 2007String Seminar, Berkeley, USA, May 2007Origins of Dark Energy workshop, Perimeter, Canada, May 2007

5. Masato Minamitsuji, “Cosmological evolutions of regularized branes in 6D warped flux compactifications”,Planck 07, Warsaw, Poland, June 2007.Cosmo 07, Brington, UK, August 2007.KIAS-YITP Joint Workshop on String Phenomenology and Cosmology, Kyoto, Japan, September 2007

6. Vitaly Vanchurin, “Numerical search for fundamental theory”,2007 Inaugural FQXi Conference, Reykjavik, Iceland, July 2007

7. Vitaly Vanchurin, “The problem of measure in Cosmology”,Initial Conditions in Cosmology workshop, Würzburg, Germany, September, 2007

8. Masato Minamitsuji, “Cosmology in six-dimensional warped flux compactifications”,Transregio 33 Annual Meeting, Bad-Honnef, Germany, October 2007

9. Masato Minamitsuji “6D cosmological solutions”,New Ideas in Modern Cosmology workshop, Paris, France, February 2008.Beyond the Standard Model workshop, Bad-Honnef, Germany, March 2008.Seminar at the Multidisciplinary Centre for Astrophysics (CENTRA), Lisbon, Portugal, June 2008.Seminar at the Institut d’Estudis Espacials de Catalunya (IEEC/CSIC), Bellaterra (Barcelona), Spain, July2008

10. Nicolas Moeller, “Closed tachyon condensation and the string coupling constant”,Beyond the Standard Model workshop, Bad-Honnef, Germany, March 2008

11. Nicolas Moeller “Closed tachyon vacua and background selection”,String Field Theory and Related Aspects workshop, Munich, Germany, March 2008

12. Vitaly Vanchurin, “Cosmic string loops: large or small?”,University of Barcelona, Barcelona, Spain, March 2008

13. Vitaly Vanchurin, “Vector Inflation and cosmological perturbations”,COSMO 08, Madison, WI, USA, September 2008Thursday Cosmology Seminar, Tufts, USA, August 2008University of Würzburg, Würzburg, Germany, July 2008

14. Vitaly Vanchurin, “Superluminal signals in k-essence cosmology”,Causality, Analyticity and Superluminal Propagation workshop, Ann Arbor, USA, October 2008.

And Moeller has attended the Strings 2008 Conference, CERN, Geneva, Switzerland, August 2008.

[1] Jin Kang, Vitaly Vanchurin, Sergei Winitzki, “Attractor scenarios and superluminal signals in k-essence cosmology,”Phys.Rev.D76:083511,2007

[2] Alexey Golovnev, Viatcheslav Mukhanov, Vitaly Vanchurin, “Vector Inflation,” JCAP 0806:009,2008[3] Alexey Golovnev, Viatcheslav Mukhanov, Vitaly Vanchurin, “Gravitational waves in vector inflation,” JCAP 0811:018,2008[4] Andrei Linde, Vitaly Vanchurin, Sergei Winitzki, “Stationary Measure in the Multiverse,” arXiv:0812.0005[5] Vitaly Vanchurin, “Geodesic measures of the landscape,” Phys.Rev.D75:023524,2007[6] Nicolas Moeller, “A tachyon lump in closed string field theory,” JHEP 0809:056,2008[7] M. Baumgartl, I. Sachs and S. L. Shatashvili, “Factorization conjecture and the open / closed string correspondence,”

JHEP 0505 (2005) 040[8] M. Baumgartl and I. Sachs, “Open-closed string correspondence: D-brane decay in curved space,” JHEP 0703 (2007) 024[9] Ken Olum, Vitaly Vanchurin, “Cosmic string loops in the expanding Universe,” Phys.Rev.D75:063521,2007

[10] Vitaly Vanchurin, “Cosmic string loops: Large and small, but not tiny,” Phys.Rev.D77:063532,2008[11] Tsutomu Kobayashi, Masato Minamitsuji, “Gravity on an extended brane in six-dimensional warped flux compactification

models,” Phys.Rev. D75:104013,2007

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[12] Masato Minamitsuji, David Langlois, “Cosmological evolutions of regularized branes in 6D warped flux compactifications,”Phy. Rev. D 76:084031,2007

[13] Tsutomu Kobayashi, Masato Minamitsuji, “Brane cosmological solutions in six-dimensional warped flux compactifications,”JCAP 0707:016

[14] Masato Minamitsuji, “Instability of brane cosmological solutions with flux compactifications,” Classical and QuantumGravity 25, 075019,2008

[15] Emilio Elizalde, Masato Minamitsuji, Wade Naylor, “Casimir effect in rugby-ball type flux compactifications,” Phy. Rev.D 75:064032,2007

[16] Masato Minamitsuji, “Casimir effect in rugby-ball-type flux compactifications,” Journal of Physics A 41, 164060,2008[17] Masato Minamitsuji, “Cosmological Kaluza-Klein branes in black-brane spacetime,” arXiv: 0805.3818, to be published in

Physics Letters B, 2008[18] Vitaly Vanchurin, “Numerical search for fundamental theory,” Phys.Rev.D77:043503,2008.

A3: D. Lüst

A: TR33 Relevante Publikationen——————————-

1. A. Ashoorioon and A. Krause,Power Spectrum and Signatures for Cascade Inflation,hep-th/0607001

2. D. Lüst, S. Reffert, E. Scheidegger, W. Schulgin and S. Stieberger,Moduli Stabilization in Type II Orientifolds (II),Nucl. Phys. B 766 (2007) 178, hep-th/060903

3. M. Haack, D. Krefl, D. Lüst, A. Van Proyen and M. Zagermann,Gaugino Condensates and D-terms from D7-branes,JHEP 0701:078, 2007, hep-th/0609211

4. A. Krause,Supersymmetry Breaking with Zero Vacuum Energy inM-theory Flux Compactifications,Phys. Rev. Lett. 98 (2007) 241601, hep-th/0701009

5. A. Krause and E. Pajer,Chasing Brane Inflation in String-Theory,JCAP 0807:023, 2008, 0705.4682 [hep-th]

6. A. Krause,Large Gravitational Waves and Lyth Bound in Multi Brane Inflation,JCAP 0807:001, 2008, 0708.4414 [hep-th]

7. A. Krause,Towards Dark Energy from String-Theory,in Proceedings of 6th International Heidelberg Conference on DarkMatter inAstro and Particle Physics, Sydney, Australia, 24-28 Sep 2007,0801.0223 [hep-th]

8. M. Haack, R. Kallosh, A. Krause, A. Linde, D. Lüst and M. Za-germann,Update of D3/D7-Brane Inflation on K3× T 2/Z2,Nucl. Phys. B 806 (2009) 103, 0804.3961 [hep-th]

9. A. Krause,Heterotic M-Theory and Cosmology,invited chapter written for book “String Cosmology”,published by Wiley-VCH, 2008

10. A. Ashoorioon, A. Krause and K. Turzynski,Energy Transfer in Multi Field Inflation and Cosmological Perturba-tions,0810.4660 [hep-th]

11. C. Caviezel, P. Koeber, S. Koers, D. Lüst, D. Tsimpis andM. Zagermann,The Effective theory of type IIA AdS(4) compactifications on nilman-ifolds and cosets,

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0806.3458 [hep-th]

B: Teilnahme an TR33 Veranstaltungen ————————————

1. Kickoff-Meeting, 3 Aug. 2006, Heidelberg2. First Meeting, 7/8 Nov. 2006, Heidelberg3. Munich Junior Researchers Meeting, 21-23 Feb. 2007, MPA

Munich4. Bonn Meeting, 30 Sep.-3 Oct. 2007, Physikzentrum Bad Honnef5. Munich, Biennial Meeting Leopoldina Conference on ”Dark

Energy”, 7.-11.Oct 2008, LMU-München

C - Besuche und Austausch an jeweils anderen Standorten: —————————————————

D. Lüst: 25. und 26. September, Besuch in HeidelbergBesuche von A. Hebecker und S. Groot Nibbelink in München

(bitte die beiden nach exakten Datum fragen)Verschiedene Besuche von H. Nilles in München

D - Direkter wissenschaftlicher Input von Wissenschaftlern des TRin ein anderes Projekt des TR: ———————————————————-

Diskussionen mit A. Hebecker ueber F-Theorie und Stringkom-paktizierungen (Bitte auch mal bei Hebecker nachragen.)

Diskussionen mit H. Nilles über Dark Matter und Dark Energy inStringkompaktifizierungen und Supergravitation

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Report December 2008Projects: A4 HDNode: Heidelberg

1. Joint publications with other nodes

[1] S. G. Nibbelink, J. Held, F. Ruehle, M. Trapletti and P. K. S. Vau-drevange, “Heterotic Z6-II MSSM Orbifolds in Blowup,”arXiv:0901.3059 [hep-th].Joint publication Heidelberg-Munich

[2] A. P. Braun, A. Hebecker, C. Ludeling and R. Valandro, “Fixing D7Brane Positions by F-Theory Fluxes,” arXiv:0811.2416 [hep-th].Joint publication Heidelberg-Bonn

[3] S. G. Nibbelink, D. Klevers, F. Ploger, M. Trapletti and P. K. S. Vau-drevange, “Compact heterotic orbifolds in blow-up,” JHEP 0804 (2008)060 [arXiv:0802.2809 [hep-th]].Joint publication Heidelberg-Bonn

[4] S. Groot Nibbelink, H. P. Nilles and M. Trapletti, “Multiple anomalousU(1)s in heterotic blow-ups,” Phys. Lett. B 652 (2007) 124 [arXiv:hep-th/0703211].Joint publication Heidelberg-Bonn

[5] S. G. Nibbelink, M. Trapletti and M. Walter, “Resolutions of Cn/ZnOrbifolds, their U(1) Bundles, and Applications to String Model Build-ing,” JHEP 0703 (2007) 035 [arXiv:hep-th/0701227].Joint publication Heidelberg-Bonn



• participation of A. Hebecker (A4) and many members of the group

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3. Networking with other nodes: visits andexchanges

• There have been strong interactions both with Bonn and Munich.

• C. Lüdeling from Heidelberg moved to Bonn as a post-doc.

• T.-W. Ha from Heidelberg moved to Bonn as a Ph.D. student.

• S. Winitzki from Munich came to Heidelberg for one semester as aninterim professor.

• S. Körs from Munich accepted a postdoc position in Heidelberg.

• Exchange of visits between Bonn and Heidelberg includes Kang-SinChoi, A. Klemm, A. Micu (Bonn) and S. Groot Nibbelink, C. Lüdeling,R. Valandro (Heidelberg).

• Exchange of visits between Heidelberg and Munich includes M. Haack,D. Lüst, A. O’Bannon, K. Schmidt-Hoberg , P. Vaudrevange (Munich)and F. Brümmer, A. Hebecker, S. Groot Nibbelink (Heidelberg).

4. Direct scientific input of Transregio-scientistsinto another Transregio project / with publi-cations

• Tae-Won Ha / Christoph Lüdeling, who received his Diploma degreein Heidelberg / worked here as a postdoc, continue to contribute toclosely related research in Bonn.

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Publication: T. W. Grimm, T. W. Ha, A. Klemm and D. Klevers,“The D5-brane effective action and superpotential in N=1 compactifi-cations,” arXiv:0811.2996 [hep-th].)

• Significant input into the research in Heidelberg (toric geometry meth-ods) came from the Munich and Bonn groups (P. K. S. Vaudrevange- formerly Munich, now Bonn; M. Walter - Bonn). Publications arelisted as ‘joint publications’ above.

• The research of B. v. Harling and A. Hebecker on Dark Matter instring-theoretic models profited, via several visits in both directions,from the experience of scientists in Bonn and Munich (Kang-Sin Choi,A. Klemm, A. Micu (Bonn), M. Haack, D. Lüst, A. O’Bannon, K.Schmidt-Hoberg , P. Vaudrevange (Munich)).Publications: B. v. Harling and A. Hebecker, “Sequestered Dark Mat-ter,” JHEP 0805 (2008) 031 [arXiv:0801.4015 [hep-ph]] and B. v. Har-ling, A. Hebecker and T. Noguchi, “Energy Transfer between Throatsfrom a 10d Perspective,” JHEP 0711 (2007) 042 [arXiv:0705.3648 [hep-th]].

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Report December 2008Projects B1

Node: Heidelberg


[1] L. Amendola, M. Baldi and C. Wetterich, Phys. Rev. D 78, 023015(2008) [arXiv:0706.3064 [astro-ph]].Joint publication Heidelberg-Munich

[2] M. Baldi, V. Pettorino, G. Robbers and V. Springel, arXiv:0812.3901[astro-ph], submitted to MNRAS.Joint publication Heidelberg-Munich


Kickoff-Meeting in Heidelberg, November 2006

• participation from Heidelberg of C. Wetterich

• talk by M. Doran “Time evolution of dark energy”


• participation from Heidelberg of C. Wetterich, M. Doran, G. Robbers


• participation by G. Robbers


• participation from Heidelberg of C. Wetterich, G. Robbers, M. Afroz

• Talks: “Growing neutrinos as a solution of the ‘why now’ problem ofdark energy” (C. Wetterich),“Constraining early dark energy” (G. Robbers)

1


• participation from Heidelberg: G. Robbers


• co-organization/participations by G. Robbers


• co-organization by G. Robbers


• participation by C. Wetterich, G. Robbers, M. Afroz

• talk by C. Wetterich: “ Dark Energy, a cosmic mystery”


• co-organization/participation by G. Robbers


exchanges

• There have been strong interactions with Munich, particularly in con-nection with project C3

• Exchange of visits between Heidelberg and Munich: M. Baldi visitedHeidelberg for collaboration with V.Pettorino (C3), G.Robbers (C3,B1).

4. Direct scientific input of Transregio-scientists

into another Transregio project / with publi-

cations

• Selection of input models and power spectra for work done in projectB4, publication: “Impact of Early Dark Energy on the Planck

2

SZ cluster sample” ,J. C. Waizmann and M. Bartelmann, A&A ac-cepted, arXiv:0804.2815 [astro-ph]

3


Report January 2009Projects: B3 MPA-ESO

Node: Munich (Garching)


No joint publication yet.


DPG - Physics School 2006: Dark Matter and Energy, July 2006;organized by Heidelberb node

• talk by W. Hillebrandt (B3)


• participation of W. Hillebrandt, B. Leibundgut (B3) and several mem-bers of the group


• participation of W. Hillebrandt, D. Sauer (B3)


• talk by W. Hillebrandt, B. Leibundgut (B3)

• participation of many members of the group


exchanges

• There have been interactions with Heidelberg (M. Bartelmann).

1

• Sandra Benitez visited C. Mignone and M. Bartelmann in December2008 to discuss collaborative work on supernova luminosity distancesand model-independent ways to reconstruct the expansion history ofthe Universe.

4. Direct scientific input of Transregio-

scientists into another Transregio project

/ with publications

– Reconstruction of cosmic expansion history from supernova dataand BAO; direct interaction with B4/B6 (Bartelmann); no publi-cations yet.

2

Report über die Aktivitäten der Gruppe von Torsten Enßlin im Transregio 33 - Stand Dezember 2008 - Gruppenmitglieder: Torsten Enßlin, Mona Frommert, Francisco Kitaura, Jens Jasche, Andre Waelkens A - Gemeinsame Veröffentlichungen mit Beteiligung mehrerer Projekte oder mehrerer Standorte. `A simulation pipeline for the Planck mission' Martin Reinecke, Klaus Dolag, Reinhard Hell, Matthias Bartelmann, Torsten A. Enßlin, Astronomy &Astrophysics 445, 373 (2006) `The actual Rees--Sciama effect from the Local Universe' Matteo Maturi, Klaus Dolag, Andre Waelkens, Volker Springel, Torsten A. Enßlin, Astronomy & Astrophysics 476, 83-88 (2007) `A linear-filter approach to extracting the Rees-Sciama effect in merging clusters of galaxies' Matteo Maturi, Torsten Enßlin, Carlos Hernandez-Monteagudo, Jose Alberto Rubino-Martin, Astronomy & Astrophysics, 467, 411-419 (2007) `Camouflaged galactic CMB foregrounds: total and polarized contributions of the kinetic Sunyaev Zeldovich effect' Andre Waelkens, Matteo Maturi, Torsten A. Enßlin, Monthly Notices of the Royal Astronomical Society 383, 1425 (2008) B - Teilnahme an gemeinsamen Veranstaltungen, Organisation gemeinsamer Veranstaltungen - TR-Treffen Aug 2006 in Heidelberg: Torsten Enßlin - Meeting Nov 2006 in Heidelberg: Mona Frommert, Francisco Kitaura, Jens Jasche - Transregio 33 Annual Meeting, Bad Honnef 2007: Torsten Enßlin, Mona Frommert, Jens Jasche, Francisco Kitaura - Munich Junior Researchers Meeting, Feb. 2007 in Garching: Mona Frommert, Jens Jasche, Francisco Kitaura (LOC) - TRR33 Winter school 2007: Jens Jasche - 3rd Biennial Leopoldina Conference on Dark Energy, Oct 2008 in Munich: Torsten Enßlin, Mona Frommert, Jens Jasche, Francisco Kitaura C - Besuche und Austausch an jeweils anderen Standorten. - keine

D - Direkter wissenschaftlicher Input von Wissenschaftlern des TR in ein anderes Projekt des TR. Input zu B8 (Galaxy power spectrum and dark energy) sowie zu C1 (Simulating the dark Universe) Francisco Kitaura, Jens Jasche, Mona Frommert und Torsten Enßlin haben optimale Methoden zur kosmographischen Rekonstruktion der Materieverteilung im Universum entwickelt, die eine akkurate Bestimmung des Spektrums der groß-skaligen kosmischen Strukturen erlauben, sowie eine Reihe von messbaren physikalischen Effekten vorhersagen. Von diesen können dann kosmologische Parameter wie der Anteil und die Evolution der Dunklen Energie abgelesen werden. Hierdurch bestimmbare Effekte, die sensitiv auf Dunkle Energie und ihre Zustandsgleichung sind, sind die Baryon-Akkusischen-Oszilationen (BAO) sowie der Integrierte Sachs-Wolfe (ISW) Effekt. Weiterhin wird die kosmische Karthographie in Zukunft Simulationen der Dunklen Materieverteilung in Dunkler Energie-Szenarien erlauben, bei denen die Anfangsbedingungen durch eine solche Rekonstruktion vorgegeben sind und somit die simulierten Strukturen denen des echten Universums teilweise eins-zu-eins zugeordnet werden können. Relevante Publikationen hierzu: `Bayesian reconstruction of the cosmological large-scale structure: methodology, inverse algorithms and numerical optimization' Francisco S. Kitaura, Torsten A. Enßlin (2008), MNRAS 389, 497 Ìnformation field theory for cosmological perturbation reconstruction and non-linear signal analysis' Torsten A. Enßlin, Mona Frommert, Francisco S. Kitaura, submitted, arXiv:0806.3474 `Kosmographie' Franciso S. Kitaura, Jens Jasche, Cheng Li, Torsten A. Enßlin Research-Highlight http://www.mpa-garching.mpg.de/mpa/research/current_research/hl2008-10/hl2008-10-de.html Òptimal ISW detection and joint likelihood for cosmological parameter estimation' Mona Frommert, Torsten A. Enßlin, Francisco S. Kitaura, accepted by MNRAS, arXiv:0807.0464 Ìroning out primordial temperature fluctuations with polarisation: optimal detection of cosmic structure imprints' Mona Frommert, Torsten A. Enßlin submitted to MNRAS, arXiv:0811.4433


Report December 2008Projects: B4 HD-M; B6 BN-HD

Node: Bonn


[1] C. Carbone, C. Baccigalupi, M. Bartelmann, S. Matarrese, V. Springel,MNRAS (2008) submitted [arXiv:astro-ph/0810.4145].Joint publication Heidelberg-Munich

[2] C. Carbone, V. Springel, C. Baccigalupi, M. Bartelmann, S. Matarrese,MNRAS 388 (2008) 1618 [arXiv:astro-ph/0711.2655].Joint publication Heidelberg-Munich

[3] J. P. Dietrich, T. Erben, G. Lamer, P. Schneider, A. Schwope, J. Hartlap,M. Maturi, A&A 470 (2007) 821 [arXiv:astro-ph/0705.3455].Joint publication Bonn-Heidelberg

[4] M. Maturi, M. Schirmer, M. Meneghetti, M. Bartelmann, L. Moscardini,A&A 462 (2007) 473 [arXiv:astro-ph/0607254].Joint publication Bonn-Heidelberg

[5] M. Maturi, T. Enßlin, C. Hernández-Monteagudo, J. A. Rubiño-Mart́ın,A&A 467 (2007) 411.Joint publication Heidelberg-Munich

[6] M. Maturi, L. Moscardini, P. Mazzotta, K. Dolag, G. Tormen, A&A475 (2007) 71 [arXiv:astro-ph/0706.0830].Joint publication Heidelberg-Munich

[7] M. Maturi, K. Dolag, A. Waelkens, V. Springel, T. Enßlin, A&A 476(2007) 83 [arXiv:astro-ph/0708.1881].Joint publication Heidelberg-Munich

1

[8] A. Waelkens, M. Maturi, T. Enßlin, MNRAS 383 (2008) 1425[arXiv:astro-ph/0707.2601].Joint publication Heidelberg-Munich

[9] M. Meneghetti, P. Melchior, A. Grazian, G. De Lucia, K. Dolag,M. Bartelmann, C. Heymans, L. Moscardini, M. Radovich, A&A 482(2008) 403 [arXiv:astro-ph/0711.3418].Joint publication Heidelberg-Munich

[10] F. Pace, M. Maturi, M. Meneghetti, M. Bartelmann, L. Moscardini,K. Dolag, A&A 471 (2007) 731 [arXiv:astro-ph/0702031].Joint publication Heidelberg-Munich

[11] F. Pace, M. Maturi, M. Bartelmann, N. Cappelluti, K. Dolag,M. Meneghetti, L. Moscardini, A&A 483 (2008) 389 [arXiv:astro-ph/0802.1200].Joint publication Heidelberg-Munich



• participation of M. Bartelmann (B4, B6) and many members of thegroup


• co-organization for the Heidelberg node by M. Maturi (B6)





2


• organization by M. Maturi (B6)


• talk by M. Bartelmann (B4, B6)



• co-organization by M. Maturi (B6)


exchanges


• E. Puchwein from Heidelberg moved to MPA Garching as a post-doc.

• Exchange of visits between Bonn and Heidelberg includes J. Pielorz(Bonn) and P. Melchior (Heidelberg).

• Exchange of visits between Heidelberg and Munich includes M. Maturi,P. Melchior, F. Pace (Heidelberg) and B. Ciardi (Munich)



cations

• Shape measurements with shapelets, direct interaction with B5 (Schnei-der, Seitz); no publication yet.

• Reconstruction of cosmic expansion history, direct interaction with B3(Hillebrandt, Leibundgut); no publications yet.

3


Report December 2008Projects: B4 HD-M; B6 BN-HD

Node: Heidelberg


[1] C. Carbone, C. Baccigalupi, M. Bartelmann, S. Matarrese, V. Springel,MNRAS (2008) submitted [arXiv:astro-ph/0810.4145].Joint publication Heidelberg-Munich

[2] C. Carbone, V. Springel, C. Baccigalupi, M. Bartelmann, S. Matarrese,MNRAS 388 (2008) 1618 [arXiv:astro-ph/0711.2655].Joint publication Heidelberg-Munich

[3] J. P. Dietrich, T. Erben, G. Lamer, P. Schneider, A. Schwope, J. Hartlap,M. Maturi, A&A 470 (2007) 821 [arXiv:astro-ph/0705.3455].Joint publication Bonn-Heidelberg

[4] M. Maturi, M. Schirmer, M. Meneghetti, M. Bartelmann, L. Moscardini,A&A 462 (2007) 473 [arXiv:astro-ph/0607254].Joint publication Bonn-Heidelberg

[5] M. Maturi, T. Enßlin, C. Hernández-Monteagudo, J. A. Rubiño-Mart́ın,A&A 467 (2007) 411.Joint publication Heidelberg-Munich

[6] M. Maturi, L. Moscardini, P. Mazzotta, K. Dolag, G. Tormen, A&A475 (2007) 71 [arXiv:astro-ph/0706.0830].Joint publication Heidelberg-Munich

[7] M. Maturi, K. Dolag, A. Waelkens, V. Springel, T. Enßlin, A&A 476(2007) 83 [arXiv:astro-ph/0708.1881].Joint publication Heidelberg-Munich

1

[8] A. Waelkens, M. Maturi, T. Enßlin, MNRAS 383 (2008) 1425[arXiv:astro-ph/0707.2601].Joint publication Heidelberg-Munich

[9] M. Meneghetti, P. Melchior, A. Grazian, G. De Lucia, K. Dolag,M. Bartelmann, C. Heymans, L. Moscardini, M. Radovich, A&A 482(2008) 403 [arXiv:astro-ph/0711.3418].Joint publication Heidelberg-Munich

[10] F. Pace, M. Maturi, M. Meneghetti, M. Bartelmann, L. Moscardini,K. Dolag, A&A 471 (2007) 731 [arXiv:astro-ph/0702031].Joint publication Heidelberg-Munich

[11] F. Pace, M. Maturi, M. Bartelmann, N. Cappelluti, K. Dolag,M. Meneghetti, L. Moscardini, A&A 483 (2008) 389 [arXiv:astro-ph/0802.1200].Joint publication Heidelberg-Munich










2


• organization by M. Maturi (B6)


• talk by M. Bartelmann (B4, B6)



• co-organization by M. Maturi (B6)


exchanges


• E. Puchwein from Heidelberg moved to MPA Garching as a post-doc.


• Exchange of visits between Heidelberg and Munich includes M. Maturi,P. Melchior, F. Pace (Heidelberg) and B. Ciardi (Munich)



cations

• Shape measurements with shapelets, direct interaction with B5 (Schnei-der, Seitz); no publication yet.

• Reconstruction of cosmic expansion history, direct interaction with B3(Hillebrandt, Leibundgut); no publications yet.

3


Report December 2008Projects: B5 BN-M

Node: Bonn


[1] Hilbert, S., Hartlap, J., White, S.D.M. & Schneider, P., MNRAS (2008)submitted [arXiv:astro-ph/0809.5035].Joint publication Munich–Bonn

[2] Erben, T., Hildebrandt, H., Lerchster, M., Hudelot, P., Benjamin, J.,van Waerbeke, L., Schrabback, T., Brimioulle, F., Cordes, O., Dietrich,J.P., Holhjem, K., Schirmer, M. & Schneider, P., A&A (2008) in press[arXiv:0811.2239].Joint publication Bonn–Munich

[3] Simon, P., Hetterscheidt, M., Wolf, C., Meisenheimer, K., Hildebrandt,H., Schneider, P., Schirmer, M. & Erben, T., MNRAS (2008) submitted[arXiv:0805.3459].Joint publication Bonn–Heidelberg

[4] Refregier, A., Douspis, M., Mellier, Y., Milliard, B., Schneider, P.,Rix, H.-W., Bender, R. et al. Experimental Astronomy (2008) in press[arXiv:0802.2522].Joint publication Bonn–Heidelberg–Munich

[5] Bradac, M., Schrabback, T., Erben, T., McCourt, M., Million, E.,Mantz, A., Allen, S., Blandford, R., Halkola, A., Hildebrandt, H., Lom-bardi, M., Marshall, P., Schneider, P., Treu, T. & Kneib, J.-P., ApJ 681(2008) 187.Joint publication Bonn–Munich

[6] Hilbert, S., White, S.D.M., Hartlap, J. & Schneider, P., MNRAS 386(2008) 1845.Joint publication Bonn–Munich

1

[7] Halkola, A., Hildebrandt, H., Schrabback, T., Lombardi, M., Bradac,M., Erben, T., Schneider, P. & Wuttke, D., A&A 481 (2008) 65.Joint publication Bonn–Munich

[8] Hilbert, S., White, S.D.M., Hartlap, J. & Schneider, P., MNRAS 382(2007) 121.Joint publication Bonn–Munich

[9] Dietrich, J.P., Erben, T., Lamer, G., Schneider, P., Schwope, A., Hart-lap, J. & Maturi, M., A&A 470 (2007) 821.Joint publication Bonn–Heidelberg–Munich

[10] Schrabback, T., Erben, T., Simon, P., Miralles, J.-M., Schneider, P.,Heymans, C., Eifler, T., Fosbury, R.A.E., Freudling, W., Hetterscheidt,M., Hildebrandt, H. & Pirzkal, N., A&A 468 (2007) 823.Joint publication Bonn–Munich

[11] Simon, P., Hetterscheidt, M., Schirmer, M., Erben, T., Schneider, P.,Wolf, C. & Meisenheimer, K., A&A 461 (2007) 861.Joint publication Bonn–Heidelberg

[12] M. Maturi, M. Schirmer, M. Meneghetti, M. Bartelmann, L. Moscardini,A&A 462 (2007) 473.Joint publication Bonn-Heidelberg



• participation of P. Schneider (B5) and many members of the group


• co-organization for the Bonn node by J. Pielorz (B5)


• participation of P. Schneider (B5) and many members of the group

2


• co-organization for the Bonn node by J. Pielorz (B5)


• participation by several members of the Bonn group


• P. Schneider as member of the SOC

• invited review by P. Schneider (B5)



exchanges

• There have been strong interactions both with Heidelberg and Munich.


• Exchange of visits between Bonn and Munich includes J. Hartlap (Bonn),S. Hilbert (Munich), M. Lombardi (Munich), S. Seitz, (Munich), Brim-ioulle (Munich), Lerchster (Munich), Schneider (Bonn), Böhnert (Bonn).



cations

• Shape measurements with shapelets, direct interaction with B6 (Bartel-mann); no publication yet.

• Joint activities in weak lensing measurements of cluster; co-supervisionof PhD student between Reiprich (B6) and Erben (B5).

3

• Data sharing of GaBoDS survey (B5) for strong lensing measurements(Bartelmann, B6).

• Joint concept development, and proposal submission for the DUNEmission, in the framework of ESA’s Cosmic Vision (Bender B8, Schnei-der B5), later merged with the SPACE proposal (including Bertoldi,B7) to Euclid.

4

Transregio33 The Dark Universe

Report December 2008Projects: B5-Munich, B8

Node: Munich


[1] R.P. Saglia, 2008 Proc. of the Conference “Classification and Discoveryin Large Astronomical Surverys”, Ringberg Castle, 14-17 October 2008,Ed. C.A.L. Bailer-Jones, AIP Conference Proceedings vol. 1082, AIP(Melville, New York), p. 366-372Joint publication GarchingB8/Heidelberg

[2] CARS: the CFHTLS-Archive-Research Survey; I. Five-band multi-colour data from 37 sq. deg. CFHTLS-Wide observations Authors: T.Erben, H. Hildebrandt, M. Lerchster, P. Hudelot, J. Benjamin, L. vanWaerbeke, T. Schrabback, F. Brimioulle, O. Cordes, J. P. Dietrich, K.Holhjem, M. Schirmer, P. Schneider A&A, in press (joint publicationMunich-Bonn B5)

[3] Brimioulle et al., submitted to A&A (joint publication Munich B5-B8)


3rd Biennial Leopoldina Conference on Dark Energy (and TR33meeting), Munich, October 2008

• R. Bender (B8/B5) was co-chair of the scientific organising committee,M. Lerchster (B5) and S. Phleps (B8) were part of the local organisingcommittee

• participation by various people of many of the projects (all membersof B5 and B8)

1

Conference “Classification and Discovery in Large AstronomicalSurverys”, Ringberg Castle, 14-17 October 2008

• participation of R. Saglia

Pan-STARRS1 Meeting, Heidelberg, April 2008

• participation by various people of B5 and B8

TR33 Meetings

• Spring meeting Bad Honnef, March 2008all members of B5 and B8

• Transregio 33 - Annual Meeting in Bad Honeff 30.09.07-03.10.07(Bender, Brimioulle, Lerchster, Seitz, Phleps, Saglia, Meneux (B5,B8)

• Meeting in Heidelberg, November 2006participation of Seitz, Bender, Phleps, Schücker (all B8/B5)

TR33, Junior researchers meeting

• Bonn, Oct. 2007,participation of B. Meneux (B8), Lerchster, Brimioulle (both B5)

• Munich, Feb. 2007R. Saglia (B8/B5), M. Lerchster (B5), F. Brimioulle (B5)

• Passo del Tonale workshop, Dec. 2007participation by members of B8 (F. Montesano, A. Balaguera-Antoĺınez)

MPE LoCuSS galaxy cluster workshop, organised by Böhringer(B7)

• 30./31. July 2008, Garching ( F. Brimioulle, M. Lerchster, A. Bauer,P. Fig= ueiro-Spinelli, T. Eichner, S. Seitz, all (B5))

2

Workshops organized by B5, and B6 together in the frameworkof the DUEL Network, this is a joint collaboration between HD,Bonn and Munich, together with further international partners

• DUEL ”Dark Universe through Extragalactic Lensing” meeting, 35.bis 27. Juni 2008, Victoria (Kanada) (A. Bauer, T. Eichner)

• DUEL ”Dark Universe through Extragalactic Lensing” meeting, Lei-den, 04. - 06. Februar 2008 (Holland) (Bender, Seitz, Lerchster,Brimioulle,Spinelli, Eichner)

• DUEL ”Dark Universe through Extragalactic Lensing” Kick-off meet-ing, Edinburgh, 08. - 11. Oktober 2007 (Schottland) (Seitz, Lerchster)

• DUEL (the Dark Universe with Extragalactic Lensing, european RTN-Network) Hiring Meeting, 26.1.2007

•

ASTROWISE Workshop am Argelander-Institut für Astronomie

• Bonn 15. - 19. Januar 2007 (Brimioulle, Lerchster)


exchanges

• Collaboration with Heidelberg (R. Saglia with C. Bailer-Jones, MPiA)to set up the Photometric Classification server for PanStarrs1 (B8)

• Collaboration with Heidelberg (A. Balaguera-Antoĺınez with D. Mota)(B8)

• Collaboration within the Munich-Bonn B5 node: Visits in Munich (B5)from collaborators from Heidelberg or Bonn:2008: Seidel (HD), Erben (BN)2007: Bartelmann (HD), Erben, Halkola, Schneider (all BN)2006: Erben (BN), Schneider (BN)Visits of Munich (B5) collaborators in Bonn:2008: Brimioulle, Lerchster (in Bonn, visiting B5-node partners)

3

2007: Brimioulle, Lerchster, Seitz (in Bonn, visiting B5-node partners)2006: Brimioulle, Lerchster, Seitz (in Bonn, visiting B5-node partners)



cations

•

4


Report December 2008Project: B6 BN-HD

Node: BonnPI: T.H. Reiprich

PhD student funded by the TRR33: H. IsraelPostdoc associated with the TRR33: Y.-Y. Zhang

1. Joint Publications with other nodes/projects

[1] Chen, Y.; Reiprich, T.H.; Böhringer, H.; Ikebe, Y.; and Zhang, Y.-Y.;A&A, 466, 805 (2007).Joint publication Bonn B6/Garching B7

[2] Böhringer, H. et al. (including Reiprich, T.H.); A&A, 469, 363 (2007).Joint publication Bonn B6/Garching B7

[3] Zhang, Y.-Y.; Finoguenov, A.; Böhringer, H.; Kneib, J.-P.; Smith, G.P.; Kneissl, R.; Okabe, N.; Dahle, H.; A&A, 482, 451 (2008).Joint publication Bonn B6/Garching B7

[4] Pierini, D.; Zibetti, S.; Braglia, F.; Böhringer, H.; Finoguenov, A.; Ly-nam, P. D.; Zhang, Y.-Y.; A&A, 483, 727 (2008).Joint publication Bonn B6/Garching B7

[5] Jia, S. M.; Böhringer, H.; Pointecouteau, E.; Chen, Y.; Zhang, Y. Y.;A&A, 489, 1 (2008).Joint publication Bonn B6/Garching B7


Meeting in Heidelberg, August 2006

• Talk given by T.H. Reiprich.

1


• Participation of T.H. Reiprich,

• participation of H. Israel.

Junior researchers meeting, Munich, February 2007

• Participation of H. Israel.


• SOC membership of T.H. Reiprich,

• talk given by T.H. Reiprich (replacement for the invited talk by S.Allen, who had to cancel attendance on short notice),

• participation of several people from the group (including H. Israel andY.-Y. Zhang).

Junior researchers meeting, Bonn, October 2007

• LOC membership of H. Israel,

• participation of H. Israel.


• Poster by T.H. Reiprich,

• poster by H. Israel.

Inter-project activities at Bonn node

• Continuous exchange in common group meetings and seminars withseveral members of projects B5, B6, B7.

2

3. Networking with other nodes: visits

• There have been strong interactions both with Heidelberg and Munichand there have been some joint publications with the Garching nodeB7 (see above).

• Visitors from Garching to Bonn include among others N. Ota, A.Finoguenov, Y.Y Zhang (exchange on X-ray properties of galaxy clus-ters), M. Lerchster, and F. Brimouille (exchange on gravitational lens-ing of galaxy clusters and related topics).

• Planned visit of H. Israel to Heidelberg (group of M. Bartelmann, B6)for early 2009 to apply methods devised in Heidelberg to data reducedand analysed in Bonn.

4. Direct scientific input of Transregio scien-

tists into another Transregio project

• Project for combined X-ray/Sunyaev-Zeldovich (SZ)/Lensing analysisof galaxy clusters involving three projects in Bonn (B5, B6, B7). Ac-tivities include a Suzaku X-ray satellite observing proposal for clustersdetected with the APEX-SZ camera (December 2008), weak lensingobservations with the ESO/MPG 2.2m telescope of APEX-SZ clusters,as well as a PhD student working on this collaborative project (startingFebruary 2009).

• In order to enhance existing collaborations, Dr. Y.-Y. Zhang movedfrom Garching (B7) to Bonn (B6) in 2007.

• Observational data products (coadded images and catalogues of weakgravitational lensing by galaxy clusters) derived in Bonn (B6) wererecently sent to the Heidelberg group of project B6 for testing of clusterdetection and shape measurement software designed by the Heidelberggroup.

• Collaborative investment of TRR33 funds into optical observing timeat ESO/MPG 2.2m telescope involving projects B6 (Bonn) and B7(Garching and Bonn).

3


Report December 2008Project C3, Hd-M

Node: Heidelberg


[1] M. Baldi, V. Pettorino, G. Robbers and V. Springel, arXiv:0812.3901[astro-ph], submitted to MNRAS. Joined Heidelberg-Munich publica-tion.

[2] L. Amendola, M. Baldi and C. Wetterich, Phys. Rev. D 78 (2008) 023015[arXiv:0706.3064 [astro-ph]]. Joined Heidelberg-Munich publication.



• participation from Heidelberg of D. F. Mota, V.Pettorino (C3)


• participation from Heidelberg of D. F. Mota, V.Pettorino (C3).


• participation from Heidelberg of T.Koivisto (C3), D. F. Mota (C3),V.Pettorino (C3).

• Talks: “Modified gravity as an alternative to the dark sector” fromD.Mota, “Imprint of anisotropic dark energy in the CMB” from T.Koivisto,“Interacting dark energy” from V.Pettorino (C3).


• participation from Heidelberg of T.Koivisto, D. F. Mota, V.Pettorino(C3).

1


• co-organization by D. F. Mota, V. Pettorino (C3).

• participation of T.Koivisto, V. Pettorino (C3).


• participation of T.Koivisto, V.Pettorino (C3).


• participation of many members of the group;

• talk by C.Wetterich, V. Pettorino (C3), poster by N.Wintergerst (C3).


• co-organization by T.Koivisto, D. F. Mota, V.Pettorino (C3).

• participation of T.Koivisto, V. Pettorino (C3).


exchanges

• There have been strong interactions with Munich.

• Exchange of visits between Heidelberg and Munich: V. Pettorino (C3)visited Munich for collaboration with K.Dolag and M.Baldi (MPA,Garching); M. Baldi visited Heidelberg for collaboration with V.Pettorino(C3), G.Robbers (C3, B1).



cations

• ...

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tr33_rep09_coverA1_Nillestr33_A1report_7_12_08tr33_a3_08_luestA4_trr33-2tr33_B1B3_networkingb4_ensslintr33_B4B6_08tr33_B4B6_bartel08b5_tr33Bonn-Schneider08B5B8_reportDec2008tr33_b6_08_reiprichB7_reportDec2008tr33_C3

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