Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-04-28
Phys.Rev. D56 (1997) 3866-3873
Physics
High Energy Physics
High Energy Physics - Phenomenology
17 pages (RevTeX), 5 figures
Scientific paper
10.1103/PhysRevD.56.3866
Chiral lagrangians as effective field theories of QCD are most suitable for the study of nucleons in a hot pion gas because they contain pions and also baryons as solitons of the same action. The semiclassical treatment of the soliton solutions must be augmented by pionic fluctuations which requires renormalisation to 1-loop, and finite temperatures do not introduce new ultraviolet divergencies and may easily be considered. Alternatively, a renormalisation scheme based on the renormalisation group equation at finite temperature comprises and extends the rigorous results of chiral perturbation theory and renders the low energy constants temperature-dependent which allows the construction of temperature-dependent solitons below the critical temperature. The temperature-dependence of the baryon energy and the pion-nucleon coupling is studied. There is no simple scaling law for the temperature-dependence of these quantities.
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