Composite self-interacting dark matter and Higgs

TL;DR

This paper introduces a new composite model where both dark matter and the Higgs are composite particles, addressing naturalness and small-scale structure issues through strong self-interactions and a novel mechanism based on top-quark partial compositeness.

Contribution

It presents a minimal four-dimensional gauge theory model that simultaneously explains composite dark matter and the Higgs, with a new mechanism for strong self-interactions.

Findings

Dark matter candidates are stable due to global U(1) symmetries.

Self-interactions are generated by top-quark partial compositeness.

Relic density achieved through thermal freeze-out.

Abstract

We propose a novel mechanism in composite models that provides self-interacting dark matter along with the Higgs itself as composite particles, alleviating the Standard Model naturalness problem and explaining small-scale discrepancies such as the core-cusp and "too big to fail" problems. These dark matter candidates are stable due to global U(1) symmetries of the composite dynamics and their strong self-interactions are created by the novel mechanism based on top-quark partial compositeness. The relic density of the dark matter candidates is particle anti-particle symmetric and due to thermal freeze-out. We implement this mechanism in a four-dimensional gauge theory with a minimal number of fermions charged under a new confining gauge group $G_{\text{HC}} $.