Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effect of a cosmological constant on propagation of vacuum polarized
  photons in stationary spacetimes   Consideration of vacuum polarization in quantum electrodynamics may affect
the momentum dispersion relation for photons for a non-trivial background, due
to appearance of curvature dependent terms in the effective action. We
investigate the effect of a positive cosmological constant $\Lambda$ on this at
one loop order for stationary $\Lambda$-vacuum spacetimes. To the best of our
knowledge, so far it has been shown that $\Lambda$ affects the propagation in a
time dependent black hole spacetime. Here we consider the static de Sitter
cosmic string and the Kerr-de Sitter spacetime to show that there can be some
non-vanishing effect due to $\Lambda$ for physical polarizations. Consistency
of these results with the polarization sum rule is discussed.

17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph