Analytical study of fermion determinant and chiral condensate behavior at finite temperatures in toy model approximation

Abstract

Fermion determinant is computed analytically on extremely large lattices $% N_τ\to \infty $ in the toy model approximation in which action is truncated so that in the Hamiltonian limit of $a_τ\to 0$ all terms of order $a_τ/a_σ$ are discarded$.$ Chiral condensate is studied in the area of small ($m<<T$) quark masses.