Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-07-27
JHEP 9908 (1999) 009
Physics
High Energy Physics
High Energy Physics - Phenomenology
21 pages, 4 Postscript figures
Scientific paper
10.1088/1126-6708/1999/08/009
Many models of supersymmetry breaking, in the context of either supergravity or superstring theories, predict the presence of particles with weak scale masses and Planck-suppressed couplings. Typical examples are the scalar moduli and the gravitino. Excessive production of such particles in the early Universe destroys the successful predictions of nucleosynthesis. In particular, the thermal production of these relics after inflation leads to a bound on the reheating temperature, T_{RH} < 10^9 GeV. In this paper we show that the non-thermal generation of these dangerous relics may be much more efficient than the thermal production after inflation. Scalar moduli fields may be copiously created by the classical gravitational effects on the vacuum state. Consequently, the new upper bound on the reheating temperature is shown to be, in some cases, as low as 100 GeV. We also study the non-thermal production of gravitinos in the early Universe, which can be extremely efficient and overcome the thermal production by several orders of magnitude, in realistic supersymmetric inflationary models.
Giudice Gian F.
Riotto Antonio
Tkachev Igor I.
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