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arXiv · 2309.16755

Gravitational Waves from Composite Dark Sectors

Roman Pasechnik·Manuel Reichert·Francesco Sannino·Zhi-Wei Wang
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Abstract

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. We show that strong first-order phase transitions occur for weak effective couplings of the composite sector leading to gravitational-wave signals potentially detectable at future experimental facilities.

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Roman Pasechnik, Manuel Reichert, Francesco Sannino, Zhi-Wei Wang. 2023-09-28. Gravitational Waves from Composite Dark Sectors. https://arxiv.org/abs/2309.16755

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