# Gravitational wave from dark sector with dark pion

## TL;DR

This paper explores gravitational wave signals from dark sector chiral symmetry breaking, analyzing WIMP and SIMP dark matter scenarios, and predicts potential observability with future space-based detectors.

## Contribution

It introduces a model connecting dark pions to gravitational wave production, distinguishing between WIMP and SIMP cases, and assesses their detectability.

## Key findings

- WIMP scenario produces detectable gravitational wave background.
- SIMP scenario results in crossover transition with no gravitational wave production.
- Future space gravitational wave detectors can observe signals from the WIMP case.

## Abstract

In this work, we investigate the spectra of gravitational waves produced by chiral symmetry breaking in dark quantum chromodynamics (dQCD) sector. The dark pion ($\pi$) can be a dark matter candidate as weakly interacting massive particle (WIMP) or strongly interacting massive particle (SIMP). For a WIMP scenario, we introduce the dQCD sector coupled to the standard model (SM) sector with classical scale invariance and investigate the annihilation process of the dark pion via the $2\pi \to 2\,\text{SM}$ process. For a SIMP scenario, we investigate the $3\pi \to 2\pi$ annihilation process of the dark pion as a SIMP using chiral perturbation theory. We find that in the WIMP scenario the gravitational wave background spectra can be observed by future space gravitational wave antennas. On the other hand, when the dark pion is the SIMP dark matter with the constraints for the chiral perturbative limit and pion-pion scattering cross section, the chiral phase transition becomes crossover and then the gravitational waves are not produced.