Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Light speed variation from gamma ray burst GRB 160509A   It is postulated in Einstein's relativity that the speed of light in vacuum
is a constant for all observers. However, the effect of quantum gravity could
bring an energy dependence of light speed. Even a tiny speed variation, when
amplified by the cosmological distance, may be revealed by the observed time
lags between photons with different energies from astrophysical sources. From
the newly detected long gamma ray burst GRB~160509A, we find evidence to
support the prediction for a linear form modification of light speed in
cosmological space.

33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess