A Big Bang Nucleosynthesis Likelihood Analysis of the Baryon-to-Photon Ratio and the Number of Light Particle Degrees of Freedom

Simple item page
dc.creatorOlive, Keith A.
dc.creatorThomas, David
dc.date1996-10-10
dc.date.accessioned2026-07-07T10:33:24Z
dc.date.available2026-07-07T10:33:24Z
dc.descriptionWe extend the model-independent likelihood analysis of big bang nucleosynthesis (BBN) based on He4 and Li7 to allow for numbers of degrees of freedom which differ from the standard model value characterized by $N_ν= 3$. We use the two-dimensional likelihood functions to simultaneously constrain the baryon-to-photon ratio and the number of light neutrinos. The upper limit thus obtained is $N_ν< 4.0$ (at 95% C.L.). We also consider the consequences if recent observations of deuterium in high-redshift QSO absorption-line systems (QSOALS) are confirmed.
dc.description12 pages, latex, 4 ps figures, requires epsf
dc.identifierhttps://arxiv.org/abs/hep-ph/9610319
dc.identifierhttp://arxiv.org/abs/hep-ph/9610319
dc.identifierAstropart.Phys.7:27-34,1997
dc.identifierdoi:10.1016/S0927-6505(97)00008-X
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/179097
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectAstrophysics
dc.titleA Big Bang Nucleosynthesis Likelihood Analysis of the Baryon-to-Photon Ratio and the Number of Light Particle Degrees of Freedom
dc.typetext

Files

Collections

arXiv