Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: SternheimerGW: a program for calculating GW quasiparticle band
  structures and spectral functions without unoccupied states   The SternheimerGW software uses time-dependent density-functional
perturbation theory to evaluate GW quasiparticle band structures and spectral
functions for solids. Both the Green's function G and the screened Coulomb
interaction W are obtained by solving linear Sternheimer equations, thus
overcoming the need for a summation over unoccupied states. The code targets
the calculation of accurate spectral properties by convoluting G and W using a
full frequency integration. The linear response approach allows users to
evaluate the spectral function at arbitrary electron wavevectors, which is
particularly useful for indirect band gap semiconductors and for simulations of
angle-resolved photoelectron spectra. The software is parallelized efficiently,
integrates with version 6.3 of Quantum Espresso, and is continuously monitored
for stability using a test farm.

11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an