New BBN limits on Physics Beyond the Standard Model from He4

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dc.creatorCyburt, Richard H.
dc.creatorFields, Brian D.
dc.creatorOlive, Keith A.
dc.creatorSkillman, Evan
dc.date2004-08-02
dc.date.accessioned2026-07-07T10:27:16Z
dc.date.available2026-07-07T10:27:16Z
dc.descriptionA recent analysis of the He4 abundance determined from observations of extragalactic HII regions indicates a significantly greater uncertainty for the He4 mass fraction. The derived value is now in line with predictions from big bang nucleosynthesis when the baryon density determined by WMAP is assumed. Based on this new analysis of He4, we derive constraints on a host of particle properties which include: limits on the number of relativistic species at the time of BBN (commonly taken to be the limit on neutrino flavors), limits on the variations of fundamental couplings such as alpha_{em} and G_N, and limits on decaying particles.
dc.description17 pages, 5 ps figures
dc.identifierhttps://arxiv.org/abs/astro-ph/0408033
dc.identifierhttp://arxiv.org/abs/astro-ph/0408033
dc.identifierAstropart.Phys.23:313-323,2005
dc.identifierdoi:10.1016/j.astropartphys.2005.01.005
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/177104
dc.subjectAstrophysics
dc.titleNew BBN limits on Physics Beyond the Standard Model from He4
dc.typetext

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