Constraints on a system of two neutral fermions from cosmology

Details Constraints on a system of two neutral fermions from cosmology Constraints on a system of two neutral fermions from cosmology

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nuphb.237..285b&link_type=abstract

Nuclear Physics B, Volume 237, Issue 2, p. 285-306.

Physics

Nuclear Physics

47

Scientific paper

Using the standard model of cosmology we study the evolution of the population of a coupled system of two neutral fermions in which the lighter one is stable. During the expansion their population can be frozen at a certain level which makes them contribute to the mass density of the universe. The details of the freezing depend crucially on the couplings and on the masses of these two fermions, so that, comparison with the measured mass density in the universe gives constraints on the parameters of the physical system we examine. We discuss in detail different configurations for the couplings among these fermions; in particular in the case of large mixing we obtain restrictive bounds on both masses. Our study is relevant to supersymmetric grand unified models which predict the occurance of light interacting neutral fermions, particularly higgsinos.

Affiliated with

Also associated with

No associations

Rating

Constraints on a system of two neutral fermions from cosmology 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 Constraints on a system of two neutral fermions from cosmology, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Constraints on a system of two neutral fermions from cosmology will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1369652