Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-10-02
Physics
High Energy Physics
High Energy Physics - Phenomenology
Expanded version of the contribution in NEUTRINO2002, May 25-30,2002, Munich, Germany. The work presented here was made and pu
Scientific paper
We review the calculation of the LSP relic density in alternative cosmological scenarios where contributions from direct decay production are important. We study supersymmetric models with intermediate unification scale. We find concrete scenarios where the reheating temperature is of order one GeV ($M_I\sim 10^{12}$) and below. If the case that this reheating temperature is associated to the decay of oscillating moduli fields appearing in string theories, we show that the LSP relic density considerably increases with respect to the standard radiation-dominated case by the effect of the direct non-thermal production by the modulus field. The LSP can become a good dark matter candidate ($0.01-0.1 \gsim \Omega h^2 \lsim 0.3-1$) for $M_I\sim 10^{12}-10^{14}$ Gev and $m_\phi\sim 1-10$ TeV.
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