Quasiequilibrium statistical mechanics of two-dimensional superfluids and the two-dimensional Coulomb gas

摘要: The virtually rigorous renormalization-group technique of Kosterlitz is applied to the vortex nucleation theory superfluidity. rate decay superfluid velocity and density for moving helium films are obtained. results applicable all temperatures on below critical point. Velocity exponents directly related a film at rest. Finite-velocity effects shown account pronounced changes in dissipation near This paper also confirms prediction that, rest, point value $\frac{{\ensuremath{\rho}}_{s}}{T}$ universal constant. At any nonzero velocity, however, finite-velocity will mask this result. subcritical static polarizability two-dimensional Coulomb gas with hard-core interactions obtained, direct analogy ${\ensuremath{\rho}}_{s}$ calculation.