Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lorentz symmetry violation due to interactions of photons with the
  graviton background   The average time delay of photons due to multiple interactions with gravitons
of the background is computed in a frame of the model of low-energy quantum
gravity by the author. The two variants of evaluation of the lifetime of a
virtual photon are considered: 1$)$ on a basis of the uncertainties relation
(it is a common place in physics of particles) and 2$)$ using a conjecture
about constancy of the proper lifetime of a virtual photon. It is shown that in
the first case Lorentz violation is negligible: the ratio of the average time
delay of photons to their propagation time is equal approximately to
$10^{-28}$; in the second one (with a new free parameter of the model), the
time-lag is proportional to the difference $\sqrt{E_{01}}-\sqrt{E_{02}}$, where
$E_{01}, E_{02}$ are initial energies of photons, and more energetic photons
should arrive later, also as in the first case. The effect of graviton pairing
is taken into account, too.

24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat