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We consider a holographic study of coupling dependent gravitational wavesproduced by the cosmic first order QCD phase transition at finite baryochemicalpotential. In the dual description, the first-order QCD phase transitioncorresponds to the first-order Hawking-Page phase transition in Gauss-Bonnetgravity. At intermediate coupling, we obtain key quantities characterizing thegravitational wave energy density spectrum. We then find that the gravitationalwaves might be detected for sufficiently large Gauss-Bonnet coupling, whilesound waves play an important role in the spectrum. We also consider asupercooling scenario during the QCD phase transition and show that thegravitational waves generated during this period can be detected by pulsartiming array experiments.

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