Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the ground state energy of the translation invariant Pauli-Fierz
  model   In this note, we determine the ground state energy of the translation
invariant Pauli-Fierz model to subleading order $O(\alpha^3)$ with respect to
powers of the finestructure constant $\alpha$, and prove rigorous error bounds
of order $O(\alpha^{4})$. A main objective of our argument is its brevity.

3
The categories of this paper are: physics
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn