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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-1674
DTSTART:20100917T210000Z
DURATION:PT1H0M0S
DTSTAMP:20260422T144235Z
LAST-MODIFIED:20100913T143347Z
LOCATION:2241 Chamberlin Hall (coffee at 3:30 pm)
SUMMARY:Big Bang Nucleosynthesis as a Probe of Cosmology and Particle 
 Physics\, Physics Department Colloquium\, Gary Steigman\, Ohio State
DESCRIPTION:Briefly\, during its early evolution\, the Universe was a 
 cosmic nuclear reactor.  The expansion and cooling of the Universe lim
 ited this epoch to the first few minutes\, allowing time for the synth
 esis in astrophysically interesting abundances of only the lightest nu
 clides: D\, 3He\, 4He\, 7Li.  For big bang nucleosynthesis (BBN) in th
 e standard models of cosmology and particle physics (SBBN)\, the SBBN-
 predicted abundances only depend on the baryon density parameter\, the
  ratio (by number) of baryons (nucleons) to photons. The predicted and
  observed abundances of the relic light elements are reviewed\, testin
 g the internal consistency of SBBN.  The consistency of BBN is further
  explored by comparing the values of the cosmological parameters infer
 red from primordial nucleosynthesis for models with non-standard early
  Universe expansion rates with those derived from studies of the cosmi
 c background radiation\, which provides a snapshot of the Universe som
 e 400 thousand years after BBN has ended.
URL:https://www.physics.wisc.edu/events/?id=1674
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