Lee-Yang edge singularity in the three-dimensional Gross-Neveu model at   finite temperature
  We discuss the relevance of the Lee-Yang edge singularity to the finite-temperature Z_2-symmetry restoration transition of the Gross-Neveu model in three dimensions. We present an explicit result for its large-N free energy density in terms of Zeta(3) and the absolute maximum of Clausen's function. 
A. C. Petkou and G. Siopsis