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Neutralino relic density in supersymmetric GUTs with no-scale boundary conditions above the unification scale

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arxiv hep-ph/0306119 v2 pith:AQ4O7LBW submitted 2003-06-13 hep-ph astro-phhep-th

Neutralino relic density in supersymmetric GUTs with no-scale boundary conditions above the unification scale

classification hep-ph astro-phhep-th
keywords scaleunificationdensitygutsneutralinoparameterrelicscalar
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We investigate SU(5) and SO(10) GUTs with vanishing scalar masses and trilinear scalar couplings at a scale higher than the unification scale. The parameter space of the models, further constrained by b-\tau Yukawa coupling unification, consists of a common gaugino mass and of \tan\beta. We analyze the low energy phenomenology, finding that A-pole annihilations of neutralinos and/or coannihilations with the lightest stau drive the relic density within the cosmologically preferred range in a significant region of the allowed parameter space. Implications for neutralino direct detection and for CERN LHC experiments are also discussed.

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