Asymmetric Dark Matter from Spontaneous Cogenesis in the Supersymmetric Standard Model

TL;DR

This paper proposes a model within the supersymmetric standard model that explains the observed ratio of dark matter to baryon density through spontaneous cogenesis, involving symmetry-breaking interactions and asymmetric dark matter.

Contribution

It introduces a novel scenario combining asymmetric dark matter and spontaneous baryogenesis with specific symmetry-breaking interactions in the supersymmetric standard model.

Findings

The model can produce comparable baryon and dark matter densities.

Symmetric dark matter annihilation is sufficient to match observed densities.

The framework accommodates TeV scale asymmetric dark matter.

Abstract

The observational relation between the density of baryon and dark matter in the Universe, $\Omega_{\rm DM}/\Omega_B\simeq 5$, is one of the most difficult problems to solve in modern cosmology. We discuss a scenario that explains this relation by combining the asymmetric dark matter scenario and the spontaneous baryogenesis associated with the flat direction in the supersymmetric standard model. A part of baryon asymmetry is transferred to charge asymmetry $D$ that dark matter carries, if a symmetry violating interaction that works at high temperature breaks not only $B-L$ but also $D$ symmetries simultaneously. In this case, the present number density of baryon and dark matter can be same order if the symmetric part of dark matter annihilates sufficiently. Moreover, the baryon number density can be enhanced as compared to that of dark matter if another $B-L$ violating interaction is still in thermal equilibrium after the spontaneous genesis of dark matter, which accommodates a TeV scale asymmetric dark matter model.