Gravitational Waves from Composite Dark Sectors

Understand

We study under which conditions a first-order phase transition in a composite dark sector can yield an observable stochastic gravitational-wave signal.

• To this end, we employ the Linear-Sigma model featuring $N_f=3,4,5$ flavours and perform a Cornwall-Jackiw-Tomboulis computation also accounting for the effects of the Polyakov loop.
• The model allows us to investigate the chiral phase transition in regimes that can mimic QCD-like theories incorporating in addition composite dynamics associated with the effects of confinement-deconfinement phase transition.
• A further benefit of this approach is that it allows to study the limit in which the effective interactions are weak.