Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ward identity for loop level soft photon theorem for massless QED
  coupled to gravity   Strominger and his collaborators pioneered the study of equivalence between
soft theorems and asymptotic conservation laws. We study this equivalence in
the context of loop level subleading soft photon theorem for massless scalar
QED in presence of dynamical gravity. Motivated by Campiglia and Laddha
\cite{1903.09133}, we show that the Sahoo-Sen soft photon theorem
\cite{1808.03288} for loop amplitudes is equivalent to an asymptotic
conservation law. This asymptotic charge is directly related to the dressing of
fields due to long range forces exclusively present in four spacetime
dimensions. In presence of gravity, the new feature is that soft photons also
acquire a dressing due to long range gravitational force and this dressing
contributes to the asymptotic charge.

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The categories of this paper are: hep-lat
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-th
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The categories of this paper are: astro-ph
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The categories of this paper are: supr-con
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The categories of this paper are: nlin
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-alg
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The categories of this paper are: funct-an
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The categories of this paper are: atom-ph
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The categories of this paper are: q-fin
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The categories of this paper are: alg-geom
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The categories of this paper are: ao-sci
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The categories of this paper are: nucl-ex
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The categories of this paper are: quant-ph
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The categories of this paper are: solv-int