Big Bang Nucleosynthesis in the New Cosmology

Journal Article · Thu Jan 24 04:00:00 EST 2008 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2870312· OSTI ID:21052866

Fields, Brian D ^[1]

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1. Center for Theoretical Astrophysics, Depts. of Astronomy and Physics, Univ. of Illinois, Urbana IL 61801 (United States)

Big bang nucleosynthesis (BBN) describes the production of the lightest elements in the first minutes of cosmic time. We review the physics of cosmological element production, and the observations of the primordial element abundances. The comparison between theory and observation has heretofore provided our earliest probe of the universe, and given the best measure of the cosmic baryon content. However, BBN has now taken a new role in cosmology, in light of new precision measurements of the cosmic microwave background (CMB). Recent CMB anisotropy data yield a wealth of cosmological parameters; in particular, the baryon-to-photon ratio {eta} = n{sub B}/n{sub {gamma}} is measured to high precision. The confrontation between the BBN and CMB ''baryometers'' poses a new and stringent test of the standard cosmology; the status of this test are discussed. Moreover, it is now possible to recast the role of BBN by using the CMB to fix the baryon density and even some light element abundances. This strategy sharpens BBN into a more powerful probe of early universe physics, and of galactic nucleosynthesis processes. The impact of the CMB results on particle physics beyond the Standard Model, and on non-standard cosmology, are illustrated. Prospects for improvement of these bounds via additional astronomical observations and nuclear experiments are discussed, as is the lingering ''lithium problem.''.

• OSTI ID: 21052866
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 972; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCURACY
ANISOTROPY
BARYONS
COMPARATIVE EVALUATIONS
COSMOLOGY
DENSITY
ELEMENT ABUNDANCE
LITHIUM
NUCLEOSYNTHESIS
PHOTONS
RELICT RADIATION
STANDARD MODEL
UNIVERSE