Abstract
We study a scenario for baryogenesis in modular cosmology and discuss its implications for the moduli stabilization mechanism and the supersymmetry (SUSY) breaking scale. If moduli fields dominate the Universe and decay into the standard model particles through diatonic couplings, the right amount of baryon asymmetry can be generated through CP violating decay of gluino into quark and squark followed by baryon-number violating squark decay. We find that, in the KKLT-type moduli stabilization, at least two non-perturbative terms are required to obtain a sizable CP phase, and that the successful baryogenesis is possible for the soft SUSY breaking mass heavier than $ \mathcal{O} $ (1) TeV. A part of the parameter space for successful baryogenesis can be probed at the collider experiments, dinucleon decay search experiment, and the measurements of electric dipole moments of neutron and electron. It is also shown that similar baryogenesis works in the case of the gravitino- or the saxion-dominated Universe.
Highlights
Asymmetry can be generated through thermal leptogenesis if the reheating temperature is sufficiently high [8]
We study a scenario for baryogenesis in modular cosmology and discuss its implications for the moduli stabilization mechanism and the supersymmetry (SUSY) breaking scale
If moduli fields dominate the Universe and decay into the standard model particles through diatonic couplings, the right amount of baryon asymmetry can be generated through CP violating decay of gluino into quark and squark followed by baryon-number violating squark decay
Summary
We consider the possibility that late-decaying moduli account for the observed baryon asymmetry of the Universe. The flavor conservation is a result of flavor-universal rational numbers called the modular weight, which determines the coupling between moduli and the matter fields in visible sector [41, 42], CP conserving soft terms are the consequence of axionic shift symmetries associated with the moduli [43]. This is true only for a simple KKLT-type moduli stabilization. It will be shown that such a sizable CP violation for baryogenesis could have interesting experimental consequences
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