Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Time Delay of Radiation from Gamma-Ray Burst Sources as a Test for a
  Model of the Universe   The estimation of light velocity dispertion caused by quantum fluctuations
influence on electromagnetic wave propogation in four-dimensional space-time is
presented. Analytical cosmological solutions for the flat and open Universe for
the case of cosmic vacuum model are obtained. The time delay of cosmic
gamma-ray burst radiation is calculated. The delay is explained by propogation
of dispersive electromagnetic wave in the expanding Universe. It is shown that
the delay value depends on a model of the Universe. We conclude that to discern
a model of the Universe measurement accuracy of parameter \Delta t / \Delta
E_{\gamma} should be better than 10^{-5} s / MeV.

29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
1
The categories of this paper are: cs
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom