Chiral Composite Asymmetric Dark Matter

TL;DR

This paper presents a chiral composite asymmetric dark matter model where strong dynamics naturally generate sub-GeV dark photon and dark pion masses, facilitating the transfer of entropy from dark to visible sectors.

Contribution

It introduces a novel chiral composite ADM model with dynamical symmetry breaking that naturally produces sub-GeV dark photon and dark pion masses.

Findings

Dark photon and dark pions acquire sub-GeV masses through dynamical symmetry breaking.

The model effectively transfers entropy from dark to visible sectors via the dark photon.

The approach provides a natural explanation for the dark matter mass scale.

Abstract

The asymmetric dark matter (ADM) scenario solves the baryon-dark matter coincidence problem when the dark matter (DM) mass is of $\mathcal{O}(1)$GeV. Composite ADM models based on QCD-like strong dynamics are particularly motivated since the strong dynamics naturally provides the DM mass of $\mathcal{O}(1)$GeV and the large annihilation cross-section simultaneously. In those models, the sub-GeV dark photon often plays an essential role in transferring the excessive entropy in the dark sector into the visible sector, i.e., the Standard Model sector. This paper constructs a chiral composite ADM model where the $U(1)_D$ gauge symmetry is embedded into the chiral flavor symmetry. Due to the dynamical breaking of the chiral flavor symmetry, the model naturally provides the masses of the dark photon and the dark pions in the sub-GeV range, both of which play crucial roles for a successful ADM model.