Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Testing the effective scale of Quantum Gravity with the next generation
  of Gamma Ray Telescopes   The actual potential of the next generation of Gamma Ray Telescopes in
improving the existing tests of an effective Quantum Gravity scale from the
study of the propagation delay for gamma rays of different energies coming from
a distant astrophysical source is discussed. It is shown that the existence of
a cosmological Gamma Ray Horizon, will impose very demanding conditions on the
observations of the telescopes to try to test a Quantum Gravity scale close to
the Planck mass.

10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin