QCD Critical Point and Hydrodynamic Evolution

cumulant expansion of thermodynamic potential in heavy-quark QCD

Jun 3, 2026, 4:30 PM

30m

Masukawa Hall (Yukawa Institute for Theoretical Physics)

Contributed

Speaker

Takahiro Doi (Kyoto University)

Description

We investigated the thermodynamic potential of heavy-quark QCD. We perform the heavy-quark expansion (hopping parameter expansion) for the QCD action and the cumulant expansion for the thermodynamic potential. We examined the convergence of the cumulant expansion for the thermodynamic potential using two independent methods. First, we estimated the convergence radius directly from the coefficients of the cumulant expansion. Second, we determined the radius of convergence using the method of Lee–Yang zeros. The two results are consistent with each other and indicate that heavy-quark QCD exhibits three distinct regimes: a pure quark regime, a pure baryon regime, and a mixed regime.