Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hedin equations in resonant micro-cavities   With the improvement of the experimental techniques, many new phenomena where
the photon degrees of freedom are involved have been discovered. Typical
examples are the exciton-polariton quasi-particles, excitons strongly coupled
to photons. A correct description of these systems requires a full account of
the photon's dynamics, including the vector gauge degrees of freedom. In order
to include this contribution in \emph{ab initio} many-body perturbation
theories, here we present a generalization of the Hedin equations, originally
derived for a many electron system with Coulomb interaction. These equations
are now derived in order to take into account the strong coupling physics of
the electrons and the \textit{transverse} photon's degrees of freedom.

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The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
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The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: eess
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
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The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
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The categories of this paper are: q-fin
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The categories of this paper are: acc-phys