Equation of state of an interacting pion gas with realistic {pi}-{pi} interactions
- Institut fuer Kernphysik (Theorie), Forschungszentrum Juelich, D-52425 Juelich (Germany)
Within the finite-temperature Green{close_quote}s-function formalism we study the equation of state of a hot interacting pion gas at zero chemical potential. Employing realistic {pi}{pi} meson-exchange interactions, we self-consistently calculate the in-medium single-pion self-energy and the {pi}{pi} scattering amplitude in the quasiparticle approximation. These quantities are then used to evaluate the thermodynamic potential {Omega}{sub {pi}}({ital T}) from which the state variables of pressure, entropy, and energy density can be derived. In contrast to earlier calculations based on the low-energy Weinberg Lagrangian we find an overall increase as compared to the free-gas results. We also consider the possibility of a dropping {rho}-meson mass as suggested by the {open_quote}{open_quote}Brown-Rho scaling{close_quote}{close_quote} law. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 284791
- Journal Information:
- Physical Review, C, Journal Name: Physical Review, C Journal Issue: 6 Vol. 53; ISSN PRVCAN; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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