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Interface Tension in QCD Matter

We have initiated the study of an entirely new class of phenomena in lattice Quantum Chromodynamics: interfaces. After almost ten years of computations on bulk thermodynamics of QCD matter one knows that it can exist in two phases: a low temperature hadron phase and a high temperature quark plasma phase. At critical temperature Tc these two phases can coexist with a stable interface in between. We show how the structure of this interface and its tension α can be determined with lattice Monte Carlo techniques. We have carried out numerical computations on the level of approx 500 h of CPU time in a single processor Cray X-MP. On an Nt = 2 lattice with an 8 × 8 × 40 spatial size the result is α/Tc3 = 0.24 ± 0.06, and the interface extends over more than 2 fm. For the case of Nt = 4 our results are still indecisive.