Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Critical and Tricritical Points for the Massless 2d Gross-Neveu Model
  Beyond Large N   Using optimized perturbation theory, we evaluate the effective potential for
the massless two dimensional Gross-Neveu model at finite temperature and
density containing corrections beyond the leading large-N contribution. For
large-N, our results exactly reproduce the well known 1/N leading order results
for the critical temperature, chemical potential and tricritical points. For
finite N, our critical values are smaller than the ones predicted by the
large-N approximation and seem to observe Landau's theorem for phase
transitions in one space dimension. New analytical results are presented for
the tricritical points that include 1/N corrections. The easiness with which
the calculations and renormalization are carried out allied to the seemingly
convergent optimized results displayed, in this particular application, show
the robustness of this method and allows us to obtain neat analytical
expressions for the critical as well as tricritical values beyond the results
currently known.

27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin