Graduate Open House: Astrophysics
March 27, 2020Session 1: 2-3pmSession 2: 3-4pm
Cosmology & Astrophysics @ Yale
Reina MaruyamaLaura Newburgh
Cosmology & Astrophysics @ Yale
Laura Newburgh
TelescopesKeck Telescopes Palomar 200-inch
SDSS
ChimeACT/Simons/CMB-S4
Mayall 4m
Hubble Space Telescope Chandra X-ray Observatory
Spitzer Space Telescope
Keck Telescopes
Telescopes
Yale Center for Research Computing
Big Data in Life ScienceGenomic Data
• HPC & Data Storage: Omega/Grace HPC clusters, GPU nodes
• Education & Training: Bootcamps on HPC, Python, Mathematica, Matlab, Parallel Computing
• Workshops: Day of Data, Hackathons
• External resources: XSEDE, BlueWaters, INCITE
Website: http://research.computing.yale.edu Email: [email protected]
Daisuke NagaiAssociate Professor in Physics & Astronomy
Research Interests – Computational Cosmology & Astrophysics: Galaxy Clusters, Galaxy Formation & Evolution, Dark Energy, Dark Matter, Cosmological Simulations, Data Science
Computational Cosmology @ Yale
Exploring the Dark Side of the Universe
Yale Particle Physics GroupMarch 27, 2020
Charlie BaltayDavid Rabinowitz
Students
Research Program1. WFIRST Space Mission2. LaSilla-QUEST Supernova Survey3. DESI Large Scale Structure4. Chronopixel Pixel Detectors
Cosmology-the large Scale Structure of the Universe
Evolution of the Universe
• Big Bang Model-the universe is expanding a la Hubble’s Law
• Contrary to all laws of physics we know about, expansion is accelerating !!
• Hypothetical reason-Dark Energy with repulsive gravity
• What is this Dark Energy ?? about 75% of our Universe
Contents of the Universe
All we know in all of our Physics Books is a lousy few % of the Universe
How do we measure the Expansion Rate of the Universe as it was billions of years ago?
Measure Expansion Velocity using very distant Supernovas
The light reaching us now was emitted 3 billion years ago!!
The nature of that light, especially its redshift, tells us about the universe, i.e. its expansion velocity, as it was 3 billion years ago!!
lightEarth
Supernova
Takes light 3 Billionyears to get to Earth
3 x 1022 Kilometers
Space Based-Far away Supernova
Ground Based-Nearby Supernova
The Supernova Survey
The SDT report presented a notional SN program, as an existence proof.
It was intentionally not optimized, since there are many ways that one could use the SN capabilities of WFIRST for this dark energy measurement.
Space Mission designed to go far back in redshift to measure expansion history of the Universe and the parameters of Dark Energy using Supernova, BAO and Weak Lensing
The WFIRST Space Mission
D. Spergel1, N. Gehrels2C. Baltay3, D. Bennett4, J. Breckinridge5, M. Donahue6, A. Dressler7, B. S. Gaudi8, T. Greene9, O. Guyon10 C. Hirata8, J. Kalirai11 N. J. Kasdin1, B. Macintosh12, W. Moos13 S. Perlmutter14, M. Postman11, B. Rauscher2 J. Rhodes15, Y. Wang16, D. Weinberg8,
The La Silla/QUEST Supernova Survey
Full time use of the Schmidt Telescope at the Cerro La Silla Observatory in Chile
Uses the large area QUEST Camera designed and built at Yale
Chronopixels
Monolithic CMOS Pixel Detectorsfor ILC Vertex Detection
C. Baltay, W. Emmet, D. Rabinowitz,K. Baker, C. Weber
Yale University
Jim Brau, N. Sinev, D. StromUniversity of Oregon
3/19/05 14
Chronopixel Vertex Detectors
• High Precision Vertex detectors• for the High Energy e+e- • and Hadron Colliders
• CMOS Pixellated detectors that • record the time of each hit-• Backgrd due to multiple beam • crossings dissappear
• Developed design with SARNOFF• in collab w/Jim Brau’s group
• Tested three rounds of prototyping,• good performance
A single 25x25 micron pixel
Cosmology with Galaxy SurveysNaim and Xinyi at recent DESI observing runs
Luna colliding fuzzy dark matter halos
A simulation of how well DESI will measure the Ly-alpha P(k) (real data to follow soon)
Reconstructing the BAO feature
Cosmic Microwave Background Measurements 21cm Measurements of Dark EnergySimons Observatory: 4 new telescopes in Chile starting 2021
CMB-S4: 19 telescopes starting 2027CHIME telescope : DRAO, British Columbia,
Canada - On sky and taking data
(Sanah working with low
temperature thermometry)
(Drone test flight at Owens Valley Radio Observatory)
(Holographic measurements at
CHIME)
(Emily working on a testbed for noise characterization in
lab)
in flight!
I work on calibration — instrumentation and analysis
I lead ‘DAQ’ : all acquisition and control software, timing, live monitoring
(Drone test flight at Brookhaven National Lab)
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