Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thermal momentum distribution from path integrals with shifted boundary
  conditions   For a thermal field theory formulated in the grand canonical ensemble, the
distribution of the total momentum is an observable characterizing the thermal
state. We show that its cumulants are related to thermodynamic potentials. In a
relativistic system for instance, the thermal variance of the total momentum is
a direct measure of the enthalpy. We relate the generating function of the
cumulants to the ratio of (a) a partition function expressed as a Matsubara
path integral with shifted boundary conditions in the compact direction, and
(b) the ordinary partition function. In this form the generating function is
well suited for Monte-Carlo evaluation, and the cumulants can be extracted
straightforwardly. We test the method in the SU(3) Yang-Mills theory and obtain
the entropy density at three different temperatures.

36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph