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Paper IPM / P / 16163  


Abstract:  
We consider a holographic study of coupling dependent gravitational waves produced by the cosmic firstorder QCD phase transition at finite baryochemical potential. In the dual description, the firstorder QCD phase transition corresponds to the firstorder HawkingPage phase transition in GaussBonnet 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 GaussBonnet coupling, while sound waves play an important role in the spectrum. 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 pulsar timing array experiments.
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