Malbouisson, A.P.C.; Portugal, R.; Svaiter, N.F. - In: Physica A: Statistical Mechanics and its Applications 292 (2001) 1, pp. 485-493
We exhibit the partition function of the zero-dimensional λϕ4 model as a simple exact expression in terms of the … plane λ, for |argλ|<π. Consequently, the partition function understood as an analytic continuation is defined for all values …-vanishing imaginary part. We also evaluate the partition function on perturbative grounds, using the Borel summation technique and we …