Asymmetric Matters from a Dark First-Order Phase Transition

TL;DR

This paper proposes a dark sector model where matter asymmetries originate from a first-order phase transition, predicting specific dark matter candidates and suggesting experimental avenues for detection and verification.

Contribution

It introduces a novel dark sector model linking matter asymmetries to a dark phase transition with testable predictions for dark matter and gravitational waves.

Findings

Dark matter could be a dark antineutron with ~1.4-1.6 GeV mass.

Model predicts strong dark matter self-interactions.

Future experiments could detect dark matter and gravitational waves from the phase transition.

Abstract

We introduce a model for matters-genesis in which both the baryonic and dark matter asymmetries originate from a first-order phase transition in a dark sector with an $SU(3)\times SU(2)\times U(1)$ gauge group and minimal matter content. In the simplest scenario, we predict that dark matter is a dark antineutron with mass either $m_{\bar{n}} = 1.36$ GeV or $m_{\bar{n}} = 1.63$ GeV. Alternatively, dark matter may be comprised of equal numbers of dark antiprotons and pions. This model, in either scenario, is highly discoverable through both dark matter direct detection and dark photon search experiments. The strong dark matter self interactions may ameliorate small-scale structure problems, while the strongly first-order phase transition may be confirmed at future gravitational wave observatories.