Baryon contrast ratio in an isentropic cosmological quark-hadron phase transition

Assuming that the quark-hadron phase transition in the early Universe satisfies the Gibbsʹ construction for a first-order equilibrium phase transition with a further constraint of a continuous entropy per baryon-number ratio across the phase boundary, we show that the baryon contrast ratio R defined as a measure of the baryon-number density inhomogeneity across the phase interface, is independent of the critical temperature Tc for the phase transition. It does not depend on the QCD parameters as well. Our finding contradicts the earlier results.