Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-12-12
Phys.Lett. B476 (2000) 356-362
Physics
High Energy Physics
High Energy Physics - Phenomenology
9 pages. As it will appear in PLB. Small typos corrected, a sign discrepancy cleared up, nothing significant
Scientific paper
10.1016/S0370-2693(00)00156-8
Starting with the vacuum fluctuation, it is known that gravitinos will be created just after inflation, with number density $\sim 10^{-2}M^3$ where $M$ is the mass of the inflaton. Here, we argue that creation may be expected to continue, maintaining about the same number density, until a usually much later epoch. This epoch is either the `intermediate epoch' when Hubble parameter falls below the gravitino mass, or the reheat epoch if that is earlier. We verify that such late-time creation indeed occurs if only a single chiral superfield is relevant, using the description of the helicity 1/2 gravitino provided recently by Kallosh et. al. (hep-th/9907124) and Giudice et. al. (hep-ph/9907510). Arguments are presented in favor of late-time creation in the general case. For the usual inflation models, $M$ is rather large and gravitinos from late-time creation are so abundant that a subsequent era of thermal inflation is needed to dilute them.
No associations
LandOfFree
Late-time creation of gravitinos from the vacuum 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 Late-time creation of gravitinos from the vacuum, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Late-time creation of gravitinos from the vacuum will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-107176