07-185 Kiro Miyazaki

Liquid-gas phase transition in canonical and micro-canonical ensembles of strange hadronic matter (343K, PDF) Jul 26, 07

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Abstract. New calculus of the liquid-gas phase transition is developed for the strange hadronic matter in the relativistic mean-field model. Against the familiar geometrical construction of phase equilibrium we investigate canonical and micro-canonical ensembles. For the former the pressure and the chemical potentials are determined from definite values of baryon density, strangeness and temperature. We recover the convex minimized Helmholtz energy. Due to the field-dependent meson-nucleon coupling constants, the section of binodal surface has no critical point. The appearance of the retrograde condensation is also proved. For micro-canonical ensemble the temperature and the chemical potentials are determined from definite values of baryon density, strangeness and pressure. We recover the concave maximized entropy and the minimized Gibbs energy. The resultant caloric and boiling curves are analyzed. Because the derivatives of chemical potentials have discontinuities at transition points, we conclude against the preceding works that the phase transition is the first order.

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