CODATA recommended values of the fundamental physical constants
Fundamental Constants
description
Transcript of Fundamental Constants
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particle physicsparticle physics nuclear …nuclear … atomic …atomic … laser …laser … solid state …solid state … astro …astro … cosmologycosmology
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Schwinger
Feynman
Pauli
Heisenberg
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SU(2) x U(1)
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Newtons constant G 1 Newtons constant G 1 fine structure constant 1fine structure constant 1coupling constant of strong interaction 1coupling constant of strong interaction 1coupling constant of weak interaction 1coupling constant of weak interaction 1mass of W boson 1mass of W boson 1mass of Higgs boson 1mass of Higgs boson 1masses of 6 quarks and 6 leptons 12 masses of 6 quarks and 6 leptons 12 flavor mixing of quarks 4flavor mixing of quarks 4flavor mixing of leptons 6flavor mixing of leptons 6
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hce /22
Arnold Arnold Sommerfeld, Sommerfeld, 19161916
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fine-structure constant hce /22
=0.00729735253
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Pauli (1958): Pauli (1958): Nr 137, Nr 137, Zürich............Zürich..............
137/1
/22
hce
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About 1.8 billion years ago, in Gabon, Westafrika. About 1.8 billion years ago, in Gabon, Westafrika.
Natural Reactor, which operated about 100 million years.Natural Reactor, which operated about 100 million years.
High concentration of uraniumHigh concentration of uranium3.7% U 235 at that time (today 0.72 %)3.7% U 235 at that time (today 0.72 %)
Moderator: water from river OkloModerator: water from river Oklo
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710)()(
nowOklo
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Change of alpha per yearChange of alpha per year
must be less thanmust be less than
per yearper year
(if no other parameters change)(if no other parameters change)
==>==>constraint questionableconstraint questionable
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year/10/ 15
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yearmm dudu /10/ 15,,
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DiracDirac (~1930) (~1930)
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Observation offine structure of atomic levels
Quasars5-7 billion years back
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Quasar absorption spectraQuasar absorption spectra
Light
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Fine structure of Fe, Ni, Mg, Sn, A - Fine structure of Fe, Ni, Mg, Sn, A -
Quasars, back to 11 bn years in timeQuasars, back to 11 bn years in time
5
15
/ ( 0.54 0.12)10
_ .: / : 1.2 10 _ _Linear App d dt per year
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Electroweak theory:Electroweak theory:
SU(2) x SU(2) x U(1)SU(2) x SU(2) x U(1)
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?
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2 28 1/ : : ( .) _ / :
3 2s s Gut Gutd dt d const d dt
2 28/ : / :
3 s sd dt d dt
Calmet, Fritzsch - Langacker, Segre (2002)
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Magnetic moments of atomic nuclei Magnetic moments of atomic nuclei would change accordingly, per yearwould change accordingly, per year
/ : 38,8 _ / :d dt d dt
143,9 10
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If only the scale of unification changes, If only the scale of unification changes,
the sign changes:the sign changes:
/ : 31_ / :d dt d dt
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yearofchange
yearofchange
/10:~
/10:~
14
15
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Time: Time:
measured by Cesium clocksmeasured by Cesium clocks
Hyperfine transition Hyperfine transition magnetic magnetic moment of the cesium nucleus.moment of the cesium nucleus.
Would be affected by time change Would be affected by time change of QCD scaleof QCD scale
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Difference: 3 CS oscillations per day
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Difference: 3 CS oscillations per day
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MPQ-ExperimentMPQ-Experiment
486 nm dye laser in hydrogen486 nm dye laser in hydrogen
spectrometerspectrometer
Reference: cesium clock Pharao LPTF Reference: cesium clock Pharao LPTF ParisParis
Hydrogen: 1s-2s transitionHydrogen: 1s-2s transition
2 466 061 413 187 127 (18) Hz2 466 061 413 187 127 (18) Hz
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15 1/ : (2.4 6.8) 10d dt yr
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Expected in simple model:Expected in simple model:about 10 times moreabout 10 times more
15 1/ : (2.4 6.8) 10d dt yr
14/ : 2 10d dt
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Simultaneous changeSimultaneous change
of the unified coupling of the unified coupling constant and the constant and the unification scale?unification scale?
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Simultaneous change of unif. coupling andSimultaneous change of unif. coupling andunif. scaleunif. scale
Partial Cancellation of effect? Partial Cancellation of effect? (expected in superstring models)(expected in superstring models)
2 28 1/ : / : ( .) _ / :
3 2s s Gut Gutd dt d dt const d dt
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Indication for effect in the Indication for effect in the new experiment at the MPQ:new experiment at the MPQ:
15/ : (3 1) 10 /d dt year
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Reinhold et al. PRL 96 (2006)Reinhold et al. PRL 96 (2006)2 quasars, 12 bn. years away2 quasars, 12 bn. years away
time variation of ratio time variation of ratio proton mass / electron massproton mass / electron mass
One finds:One finds:
5/ (2 0.6) 10
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15/ 3 10 / year
15/ 3 10 / year
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15/ 3 10 / year
15/ 3 10 / year
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The masses of atomic nuclei The masses of atomic nuclei will depend on time!will depend on time!
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28 constants of nature28 constants of nature
24 constants 24 constants mass parameters mass parameters
Grand unification relates the elm., Grand unification relates the elm., strong and weak interactions.strong and weak interactions.
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The time variation of alpha leads The time variation of alpha leads to a time variation of the QCD to a time variation of the QCD scale.scale.
The MPQ Experiment rules out The MPQ Experiment rules out the simplest model. the simplest model.
An effect seems to be present, An effect seems to be present, about a factor 10 less than about a factor 10 less than naively expected, consistent with naively expected, consistent with the observed variation of the the observed variation of the electron-proton mass ratio.electron-proton mass ratio.
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Necessary:Necessary:
Both unification scale Both unification scale and theand the unified coupling constantunified coupling constant must change in time.must change in time. (expected in superstring (expected in superstring models)models)
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All fundamental constants All fundamental constants are not constant, but are not constant, but functions of time?functions of time?
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nG
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