Nonperturbative Yukawa theory at finite density and temperature

Details Nonperturbative Yukawa theory at finite density and temperature Nonperturbative Yukawa theory at finite density and temperature

2009-02-09

arxiv.org/abs/0902.1498v2

Phys.Rev.D79:065026,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, 15 figures; v2: references added, improved discussion in the Conclusions, matches published version

Scientific paper

10.1103/PhysRevD.79.065026

In-medium Yukawa theory is part of the thermodynamics of the Standard Model of particle physics and is one of the main building blocks of most effective field theories of fermionic systems. By computing its pressure we investigate the nonperturbative thermodynamics at finite temperature and density using the optimized perturbation theory (OPT) framework. Our calculations are valid for arbitrary fermion and scalar masses, temperature, chemical potential, and not restricted to weak coupling. The model is considered in the presence as well as in the absence of condensates. Comparison with nonperturbative results shows that second order perturbation theory (PT) fails in the first case but performs rather well when condensates are absent, even at high-temperature regimes.

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