Bump of sound velocity in dense 2-color QCD
November 09, 2022
We obtain the equation of state (EoS) and the sound velocity for 2-color QCD at low temperature and high density and find that in the superfluid phase, c_s^2/c^2 >1/3, where 1/31/3 is the value at the relativistic limit. Several independent Monte Carlo studies on 2-color QCD have been conducted intensively in recent years. These works have shown a clear evidence of phase transition between hadronic and superfluid phases. In our paper, we have investigated the EoS and sound velocity in both phases. Our result is consistent with chiral perturbation theory in a low \muμ regime of the superfluid phase including the Bose-Einstein condensed phase, and shows a peak of sound velocity in the high-density BCS phase. We also give detailed simulation results and a comment on the holography bound in this proceedings.
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