Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Renormalization group study of the 1d polaron problem   We investigate the one-dimensional polaron problem and calculate the ground
state energy and the effective mass. We use a real-time renormalization group
method and compare our results with first and second order perturbation theory,
with Feynman's variational principle and with the method of Lee, Low and Pines.

27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph