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

Understand

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, while sound waves play an important role in the spectrum.