Following a baryogenesis scenario proposed by Lazarides, Panagiotakopoulos and Shafi, we show how the observed baryon asymmetry can be explained via resonant leptogenesis in a class of supersymmetric models with an intermediate mass scale M I 10 9 GeV. It involves the out of equilibrium decay of heavy ( M I ) right handed neutrinos at a temperature close to the TeV supersymmetry breaking scale. Such models can also resolve the MSSM µ problem.
We consider two classes of t-b-τ quasi-Yukawa unification scenarios which can arise from realistic supersymmetric SO(10) andWe show that these scenarios can be successfully implemented in the CMSSM and NUHM1 frameworks, and yields a variety of sparticle spectra with WMAP compatible neutralino dark matter. In NUHM1 we find bino-higgsino dark matter as well as the stau coannihilation and A-funnel solutions. The CMSSM case yields the stau coannihilation and A-funnel solutions. The gluino and squark masses are found to lie in the TeV range.
We discuss how in supersymmetric models with D and F -flat directions, a primordial monopole flux of order 10 −16 − 10 −18 cm −2 sec −1 sr −1 can coexist with the observed baryon asymmetry. A modified Affleck-Dine scenario yields the desired asymmetry if the monopoles are superheavy (∼ 10 13 − 10 18 GeV). For lighter monopoles with masses ∼ 10 9 − 10 12 GeV, the baryon asymmetry can arise via TeV scale leptogenesis.
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