Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Field Theory in a Multi-Metric Background   By means of simple models in a flat spacetime manifold we examine some of the
issues that arise when quantizing interacting quantum fields in multi-metric
backgrounds. In particular we investigate the maintenance of a causal structure
in the models. In this context we introduce and explain the relevance of an
interpolating metric that is a superposition of the individual metrics in the
models. We study the renormalisation of a model with quartic interactions and
elucidate the structure of the renormalisation group and its implications for
Lorentz symmetry breakdown.

20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an