Gravitational wave signatures of first-order phase transition in two-component dark matter model

TL;DR

This paper explores a scale-invariant two-component dark matter model, demonstrating that certain parameters can produce detectable gravitational waves from a first-order electroweak phase transition, compatible with dark matter constraints.

Contribution

It introduces a novel two-component dark matter model with gravitational wave predictions from a first-order phase transition, constrained by relic density and detection bounds.

Findings

Detectable gravitational wave spectrum from the phase transition.

Model consistent with relic density and direct detection constraints.

Potential observation by future space-based GW detectors.

Abstract

Here, we consider a classically scale-invariant extension of the Standard Model (SM) with two-component dark matter (DM) candidates, including a Dirac spinor and a scalar DM. We probe the parameter space of the model, constrained by relic density and direct detection, and investigate the generation of gravitational waves (GWs) produced by an electroweak first-order phase transition. The analysis demonstrates that there are points in the parameter space, leading to a detectable GW spectrum arising from the first-order phase transition, which is also consistent with the DM relic abundance and direct detection bounds. These GWs could be observed by forthcoming space-based interferometers such as the Big Bang Observer, Decihertz Interferometer Gravitational-wave Observatory, and Ultimate-Decihertz Interferometer Gravitational-wave Observatory.