Opening the window to the cogenesis with Affleck-Dine mechanism in gravity mediation

TL;DR

This paper revisits the Affleck-Dine mechanism for baryogenesis and dark matter cogenesis via Q-balls in gravity mediation, emphasizing updated decay rates and identifying wino dark matter as consistent with observed densities.

Contribution

It provides an improved analysis of Q-ball decay rates and demonstrates that successful baryon and dark matter cogenesis occurs with wino dark matter in a specific mass range.

Findings

Q-ball decay rates are significantly affected by squark annihilation into quarks.

Successful cogenesis is achieved with a wino dark matter candidate of 0.3-1 TeV.

The revised decay rates support the Affleck-Dine mechanism as a viable explanation for baryon-dark matter coincidence.

Abstract

The observed baryon and dark matter densities are equal up to a factor of 5. This observation indicates that the baryon asymmetry and dark matter have the same origin. The Affleck-Dine baryogenesis is one of the most promising mechanisms in this context. Q balls, which are often formed in the early Universe associated with the Affleck-Dine baryogenesis, decay both into supersymmetric particles and into quarks. Recently, it was pointed out that annihilation of squarks into quarks gives a dominant contribution to the Q-ball decay rate and the branching ratio of Q-ball decay into supersymmetric particles changes from the previous estimate. In this paper, the scenario of baryon and dark matter cogenesis from Q ball in gravity mediation is revisited in respect of the improved Q-ball decay rates. It is found that the successful cogenesis takes place when a wino with mass 0.3-1 TeV is dark matter.