Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Vacuum Cherenkov Radiation In Quantum Electrodynamics With High-Energy
  Lorentz Violation   We study phenomena predicted by a renormalizable, CPT invariant extension of
the Standard Model that contains higher-dimensional operators and violates
Lorentz symmetry explicitly at energies greater than some scale Lambda_{L}. In
particular, we consider the Cherenkov radiation in vacuo. In a rather general
class of dispersion relations, there exists an energy threshold above which
radiation is emitted. The threshold is enhanced in composite particles by a
sort of kinematic screening mechanism. We study the energy loss and compare the
predictions of our model with known experimental bounds on Lorentz violating
parameters and observations of ultrahigh-energy cosmic rays. We argue that the
scale of Lorentz violation Lambda_{L} (with preserved CPT invariance) can be
smaller than the Planck scale, actually as small as 10^{14}-10^{15} GeV. Our
model also predicts the Cherenkov radiation of neutral particles.

19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat