Asymmetric capture of Dirac dark matter by the Sun

TL;DR

This paper explores how Dirac dark matter and anti-dark matter can be asymmetrically captured by the Sun, potentially affecting solar physics and offering new solutions to the solar composition problem.

Contribution

It introduces a model where Dirac dark matter and anti-dark matter have different capture cross sections, leading to asymmetry in solar capture even with typical annihilation rates.

Findings

Asymmetry in captured dark matter and anti-dark matter is possible.

Capture rates can significantly influence solar physics.

Potential to address the solar composition problem.

Abstract

Current problems with the solar model may be alleviated if a significant amount of dark matter from the galactic halo is captured in the Sun. We discuss the capture process in the case where the dark matter is a Dirac fermion and the background halo consists of equal amounts of dark matter and anti-dark matter. By considering the case where dark matter and anti-dark matter have different cross sections on solar nuclei as well as the case where the capture process is considered to be a Poisson process, we find that a significant asymmetry between the captured dark particles and anti-particles is possible even for an annihilation cross section in the range expected for thermal relic dark matter. Since the captured number of particles are competitive with asymmetric dark matter models in a large range of parameter space, one may expect solar physics to be altered by the capture of Dirac dark matter. It is thus possible that solutions to the solar composition problem may be searched for in these type of models.