Cosmological Constraints in SUSY with Yukawa Unification

Details Cosmological Constraints in SUSY with Yukawa Unification Cosmological Constraints in SUSY with Yukawa Unification

2001-02-05

arxiv.org/abs/hep-ph/0102049v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 3 figures Talk given in Cosmology 2000, July 2000, Lisbon, Portugal

Scientific paper

The cosmological relic density of the lightest supersymmetric particle of the minimal supersymmetric standard model is calculated under the assumption of gauge and Yukawa coupling unification. We employ radiative electroweak breaking with universal boundary conditions from gravity-mediated supersymmetry breaking. Further constraints are imposed by the experimental bounds on the b-quark mass and the BR(b -> s gamma). We find that coannihilation of the lightest supersymmetric particle, which turns out to be an almost pure bino, with the next-to-lightest supersymmetric particle (the lightest stau) is crucial for reducing its relic density to an acceptable level.

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