Dark matter in classically conformal theories: WIMP and supercooling

TL;DR

This paper investigates conformal theories' natural dark matter candidates, exploring WIMP and supercooled scenarios influenced by unique phase transition histories, with implications for gravitational wave detection.

Contribution

It introduces two dark matter scenarios within conformal SU(2)_X gauge theories and analyzes their production, constraints, and gravitational wave signatures.

Findings

Viable parameter space identified for WIMP and supercooled DM.

Gravitational wave signals can detect both DM regimes.

Distinct phase transition histories influence production mechanisms.

Abstract

Beyond solving the hierarchy problem, classically conformal (CC) theories naturally accommodate dark matter (DM). In this work, we explore the CC $SU(2)_X$ gauge theory with a triplet dark scalar, uncovering two distinct DM scenarios: weakly interacting massive particle (WIMP) and supercooled DM. The production mechanisms are strongly influenced by the CC model's unique first-order phase transition evolution history, which differs significantly from those in non-conformal models. We obtain the viable parameter space for each scenario and investigate the current constraints and future sensitivities at experiments, demonstrating that gravitational wave signals from the phase transition provide a common detection channel for both the WIMP and supercooled DM regimes.