Supermassive gravitinos, dark matter, leptogenesis and flat direction baryogenesis

Details Supermassive gravitinos, dark matter, leptogenesis and flat direction baryogenesis Supermassive gravitinos, dark matter, leptogenesis and flat direction baryogenesis

2005-04-13

arxiv.org/abs/hep-ph/0504102v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

47 pages, 6 figures, JHEP style

Scientific paper

In general the gravitino mass and/or the soft supersymmetry breaking masses in the observable sector can be much larger than the TeV scale. Depending on the relation between the masses, new important channels for gravitino production in the early Universe can arise. Gravitinos with a mass above 50 TeV decay before big bang nucleosynthesis, which leads to relaxation of the well known bound on the reheating temperature $T_{\rm R} \leq 10^{10}$ GeV. However, if the heavy gravitinos are produced abundantly in the early Universe, their decay can alter the abundance of the lightest supersymmetric particle. Moreover, they may dominate the energy density of the Universe. Their decay will in this case increase entropy and dilute already created baryon asymmetry and dark matter. Such considerations put new constraints on gravitino and sfermion masses, and the reheating temperature. In this paper we examine various cosmological consequences of supermassive gravitinos. We discuss advnatges and disadvantages of a large reheating temperature in connection with thermal leptogenesis, and find that large parts of the parameter space are opened up for the lightest right-handed (s)neutrino mass. We also discuss the viability of Affleck-Dine baryogenesis under the constraints from gravitino decay, and gravitino production from the decay of Q-balls.

Affiliated with

Also associated with

No associations

Rating

Supermassive gravitinos, dark matter, leptogenesis and flat direction baryogenesis 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 Supermassive gravitinos, dark matter, leptogenesis and flat direction baryogenesis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Supermassive gravitinos, dark matter, leptogenesis and flat direction baryogenesis will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-249592