Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Renormalized Thermal Mass with Non-Zero Charge Density   The linear $\delta$ expansion is used to obtain corrections up to
O$(\delta^2)$ to the self-energy for a complex scalar field theory with a
$\lambda (\phi^{\star}\phi)^2$ interaction at high temperature and non-zero
charge density. The calculation is done in the imaginary-time formalism via the
Hamiltonian form of the path integral. Nonperturbative results are generated by
a systematic order by order variational procedure and the dependence of the
critical temperature on the chemical potential $\mu$ is obtained.

19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio