Low Temperature Dominance of Pion-like Excitations in the Massive Gross-Neveu Model at Order 1/N

Details Low Temperature Dominance of Pion-like Excitations in the Massive Gross-Neveu Model at Order 1/N Low Temperature Dominance of Pion-like Excitations in the Massive Gross-Neveu Model at Order 1/N

1996-07-29

arxiv.org/abs/hep-ph/9607457v1

Phys.Rev. D55 (1997) 2247-2256

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTex, 19 pages + 3 figure.ps

Scientific paper

10.1103/PhysRevD.55.2247

We perform a 1/N-expansion of the partition function of the massive Gross-Neveu model in 1+1 dimensions. The procedure allows for the inclusion of the contribution of scalar and pseudoscalar composites (of order 1/N) to the equation of state. The naive expectation that the bosonic fluctuations correct significantly the mean field approximation at low temperatures is confirmed by our calculations. Actually the relevant degrees of freedom of hadronic matter at low temperatures are found to be pion-like excitations, rather than the fundamental constituents.

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