Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Geometry and Matter Reduction in a 5D Kaluza-Klein Framework   In this paper we consider the Kaluza-Klein fields equations in presence of a
generic 5D matter tensor which is governed by a conservation equation due to 5D
Bianchi identities. Following a previous work, we provide a consistent approach
to matter where the problem of huge massive modes is removed, without relaxing
the compactification hypotheses; therefore we perform the dimensional reduction
either for metric fields and for matter, thus identifying a pure 4D tensor
term, a 4D vector term and a scalar one. Hence we are able to write down a
consistent set of equations for the complete dynamics of matter and fields ;
with respect to the pure Einstein-Maxwell system we now have two additional
scalar field: the usual dilaton one plus a scalar source term. Some significant
scenarios involving these terms are discussed and perspectives for cosmological
applications are suggested.

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The categories of this paper are: hep-ex
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The categories of this paper are: stat
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The categories of this paper are: econ
34
The categories of this paper are: chem-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
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The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
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The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
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The categories of this paper are: quant-ph
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The categories of this paper are: patt-sol