Gravitational waves of a first-order QCD phase transition at finite coupling from holography

Abstract

We consider a holographic study of coupling dependent gravitational waves produced by the cosmic first-order QCD phase transition at finite baryochemical potential. In the dual description, the first-order QCD phase transition corresponds to the first-order Hawking–Page phase transition in Gauss–Bonnet gravity. At intermediate coupling, we obtain key quantities characterizing the gravitational wave energy density spectrum. We then find that the gravitational waves might be detected for sufficiently large Gauss–Bonnet coupling. We also consider a supercooling scenario during the QCD phase transition and show that the gravitational waves generated during this period can be detected by various future gravitational wave experiments.