Relic Neutralino Density in Scenarios with Intermediate Unification Scale

Details Relic Neutralino Density in Scenarios with Intermediate Unification Scale Relic Neutralino Density in Scenarios with Intermediate Unification Scale

2002-02-15

arxiv.org/abs/hep-ph/0202139v1

NewJ.Phys.4:27,2002

Physics

High Energy Physics

High Energy Physics - Phenomenology

Latex, 11 pages, 2 figures

Scientific paper

10.1088/1367-2630/4/1/327

We analyse the relic neutralino density in supersymmetric models with an intermediate unification scale. In particular, we present concrete cosmological scenarios where the reheating temperature is as small as $\cal{O}$ $1 - 1000$ MeV). When this temperature is associated to the decay of moduli fields producing neutralinos, we show that the relic abundance increases considerably with respect to the standard thermal production. Thus the neutralino becomes a good dark matter candidate with $0.1\lsim \Omega h^2 \lsim 0.3$, even for regions of the parameter space where large neutralino-nucleon cross sections, compatible with current dark matter experiments, are present. This is obtained for intermediate scales $M_I\sim 10^{11}-10^{14}$ GeV, and moduli masses $m_\phi\sim 100-1000$ GeV. On the other hand, when the above temperature is associated to the decay of an inflaton field, the relic abundance is too small.

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