A Supersymmetric Model for Dark Matter and Baryogenesis Motivated by the Recent CDMS Result

TL;DR

This paper proposes a supersymmetric model where dark matter and baryogenesis are generated non-thermally after reheating, with dark matter being a light scalar particle consistent with recent direct detection results, and predicts testable TeV-scale colored particles.

Contribution

The model introduces a novel non-thermal production mechanism for light scalar dark matter and baryogenesis via moduli decay, differing from conventional thermal WIMP scenarios.

Findings

Dark matter mass in 8-10 GeV range consistent with CDMS results

Baryogenesis occurs at low temperatures from moduli decay

Predicts TeV-scale colored particles accessible at the LHC

Abstract

We discuss a supersymmetric model for cogenesis of dark and baryonic matter where the dark matter (DM) has mass in the 8-10 GeV range as indicated by several direct detection searches including most recently the CDMS experiment with the desired cross section. The DM candidate is a real scalar filed. Two key distinguishing features of the model are the following: (i) in contrast with the conventional WIMP dark matter scenarios where thermal freeze-out is responsible for the observed relic density, our model uses non-thermal production of dark matter after reheating of the universe caused by moduli decay at temperatures below the QCD phase transition, a feature which alleviates the relic over-abundance problem caused by small annihilation cross section of light DM particles; (ii) baryogenesis occurs also at similar low temperatures from the decay of TeV scale mediator particles arising from moduli decay. A possible test of this model is the existence of colored particles with TeV masses accessible at the LHC.