Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dissipative systems in metric theories of gravity. Foundations and
  applications of the energy formalism   In this paper we introduce a new procedure, termed by us \emph{energy
formalism}, to deal with dissipative systems in metric theories of gravity.
This approach aims at determining the analytic expression of Rayleigh
dissipation function in the context of the inverse problem in the calculus of
variations. We describe our method in detail, presenting a simple example.
After, we consider as first extensive application the general relativistic
Poynting-Robertson effect. The obtained results and future implications are
discussed.

13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
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The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin