The Gross-Neveu model at finite temperature at next to leading order in the 1/N expansion

Details The Gross-Neveu model at finite temperature at next to leading order in the 1/N expansion The Gross-Neveu model at finite temperature at next to leading order in the 1/N expansion

2002-12-05

arxiv.org/abs/hep-ph/0212084v1

Annals Phys. 307 (2003) 209-271

Physics

High Energy Physics

High Energy Physics - Phenomenology

77 pages, 19 figures (some of them bitmaped, for original figures contact authors)

Scientific paper

10.1016/S0003-4916(03)00072-1

We present new results on the Gross-Neveu model at finite temperature and at next-to-leading order in the 1/N expansion. In particular, a new expression is obtained for the effective potential which is explicitly invariant under renormalization group transformations. The model is used as a playground to investigate various features of field theory at finite temperature. For example we verify that, as expected from general arguments, the cancellation of ultraviolet divergences takes place at finite temperature without the need for introducing counterterms beyond those of zero-temperature. As well known, the discrete chiral symmetry of the 1+1 dimensional model is spontaneously broken at zero temperature and restored, in leading order, at some temperature T_c; we find that the 1/N approximation breaks down for temperatures below T_c: As the temperature increases, the fluctuations become eventually too large to be treated as corrections, and a Landau pole invalidates the calculation of the effective potential in the vicinity of its minimum. Beyond T_c, the 1/N expansion becomes again regular: it predicts that in leading order the system behaves as a free gas of massless fermions and that, at the next-to-leading order, it remains weakly interacting. In the limit of large temperature, the pressure coincides with that given by perturbation theory with a coupling constant defined at a scale of the order of the temperature, as expected from asymptotic freedom.

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