Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Decay properties of the one-particle Green function in real space and
  imaginary time   The decay properties of the one-particle Green function in real space and
imaginary time are systematically studied for solids. I present an analytic
solution for the homogeneous electron gas at finite and at zero temperature as
well as asymptotic formulas for real metals and insulators that allow an
analytic treatment in electronic-structure calculations based on a space-time
representation. The generic dependence of the decay constants on known system
parameters is used to compare the scaling of reciprocal-space algorithms for
the GW approximation and the space-time method.

20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg