Abstract
We study a cogenesis mechanism in which the observed baryon asymmetry of the universe and the dark matter abundance can be produced simultaneously at low reheating temperature without violating baryon number in the fundamental vertex. In particular, we consider a model which could be realized in the context of type IIB large volume string compactifications. The matter superfields in this model include additional pairs of color triplet and singlet superfields in addition to the Minimal Supersymmetric Standard Model (MSSM) superfields. Assuming that the mass of the additional singlet fermions is O(GeV) and color triplet fermions is O(TeV), we show that the modulus dominantly decays into the additional color triplet superfields. After soft supersymmetry (SUSY) breaking, the lightest eigenstate of scalar component of color triplet superfield further decays into fermionic component of singlet superfield and quarks without violating baryon number. Assuming R-parity conservation, it follows that the singlet superfield will not further decay into the SM particles and therefore it can be considered as a stable asymmetric dark matter (ADM) component. We find that the decay of the lightest eigenstate of scalar component of color triplet superfield gives the observed baryon asymmetry in the visible sector, an asymmetric dark matter component with the right abundance and naturally explains cosmic coincidence.
Highlights
In cosmology some of the important puzzles are related to the origin of baryon asymmetry of the universe and the nature of dark matter
We demonstrate that in the context of N = 1 supergravity, the interaction coupling of the modulus to the pair of singlet superfields as well as the colored superfields can be constrained depending upon the masses of the same
We find that the branching ratio of the modulus decaying into the pair of additional singlets is suppressed by a factor of 10−6 as compared to the decay of the modulus into the pair of color triplets
Summary
In cosmology some of the important puzzles are related to the origin of baryon asymmetry of the universe and the nature of dark matter. We propose a model for moduli induced cogenesis which simultaneously generates the baryon asymmetry of the universe and an asymmetric dark matter (ADM) component with a dark matter mass around 5 GeV. In this model, the particle content include two additional iso-singlet color triplet superfields χ and χwith hypercharges −4/3 and 4/3 respectively and two singlet superfields N and N 1.
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