Neutralino dark matter, b tau Yukawa unification and nonuniversal sfermion masses

We study the implications of minimal non-Universal Boundary Conditions in the sfermion Soft SUSY Breaking (SSB) masses of mSUGRA. We impose asymptotic b-tau Yukawa coupling Unification and we resort to a parameterization of the deviation from Universality in the SSB motivated by the multiplet structure of SU(5) GUT. A set of cosmo-phenomenological constraints, including the recent results from WMAP, determines the allowed parameter space of the models under consideration. We highlight a new coannihilation corridor where neutralino-sbottom and neutralino-tau sneutrino-stau coannihilations significantly contribute to the reduction of the neutralino relic density.

12.60.Jv
14.80.Ly
12.10.Kt
95.35.+d
grand unified theory: SU(5)
supersymmetry: symmetry breaking
supergravity: minimal
sfermion: mass
boundary condition
coupling: Yukawa

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