Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spontaneous Breaking of Lorentz Symmetry by Ghost Condensation in
  Perturbative Quantum Gravity   In this paper we will study the spontaneous breakdown of the Lorentz symmetry
by ghost condensation in perturbative quantum gravity. Our analysis will be
done in the Curci-Ferrari gauge. We will also analyse modification of the BRST
and the anti-BRST transformations by the formation of this ghost condensate. It
will be shown that even though the modified BRST and the modified anti-BRST
transformations are not nilpotent, their nilpotency is restored on-shell.

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The categories of this paper are: hep-ph
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
2
The categories of this paper are: math
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
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The categories of this paper are: hep-lat
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The categories of this paper are: cs
6
The categories of this paper are: astro-ph