Increasing the effective number of neutrinos with decaying particles

Details Increasing the effective number of neutrinos with decaying particles Increasing the effective number of neutrinos with decaying particles

2007-03-04

arxiv.org/abs/hep-ph/0703034v2

JCAP 0705:008,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

24 pages, 2 figures

Scientific paper

10.1088/1475-7516/2007/05/008

We present models of decaying particles for increasing the effective number of neutrinos N_nu after big bang nucleosynthesis but before the structure formation begins. We point out that our scenario not only solves the discrepancy between the constraints on N_nu from these two epochs, but also provides a possible answer to deeper inconsistency in the estimation of the matter power spectrum amplitude at small scales, represented by sigma_8, between the WMAP and some small scale matter power measurements such as the Lyman-alpha forest and weak lensing. We consider (a) saxion decay into two axions; (b) gravitino decay into axino and axion; (c) Dirac right-handed sneutrino decay into gravitino and right-handed neutrino.

Affiliated with

Also associated with

No associations

Rating

Increasing the effective number of neutrinos with decaying particles 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 Increasing the effective number of neutrinos with decaying particles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Increasing the effective number of neutrinos with decaying particles will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-478432