Effective number of neutrinos and baryon asymmetry from BBN and WMAP

Details Effective number of neutrinos and baryon asymmetry from BBN and WMAP Effective number of neutrinos and baryon asymmetry from BBN and WMAP

2003-05-08

arxiv.org/abs/hep-ph/0305075v1

Phys.Lett.B566:8-18,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 10 figures, 2 tables

Scientific paper

10.1016/S0370-2693(03)00800-1

We place constraints on the number of relativistic degrees of freedom and on the baryon asymmetry at the epoch of Big Bang Nucleosynthesis (BBN) and at recombination, using cosmic background radiation (CBR) data from the Wilkinson Microwave Anisotropy Probe (WMAP), complemented by the Hubble Space Telescope (HST) Key Project measurement of the Hubble constant, along with the latest compilation of deuterium abundances and measurements of the primordial helium abundance. The agreement between the derived values of these key cosmological and particle physics parameters at these widely separated (in time or redshift) epochs is remarkable. From the combination of CBR and BBN data, we find the 2\sigma ranges for the effective number of neutrinos and for the baryon asymmetry (baryon to photon number ratio \eta) to be 1.7-3.0 and 5.53-6.76 \times 10^{-10}, respectively.

Affiliated with

Also associated with

No associations

Rating

Effective number of neutrinos and baryon asymmetry from BBN and WMAP does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Effective number of neutrinos and baryon asymmetry from BBN and WMAP, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Effective number of neutrinos and baryon asymmetry from BBN and WMAP will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-23328