Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Helicity and spin conservation in Maxwell theory and Linearized Gravity   A duality symmetric formulation of linearized gravity has been introduced by
Barnett and used to show the conservation of helicity. However, the relation
between helicity and spin as well as the separate conservation of the spin and
orbital parts of angular momentum, which is known to hold in Maxwell theory,
was not considered. These conservation laws are known to follow from the
conservation of the so-called helicity array, an analog of the zilch tensor,
which includes helicity, spin, and spin-flux or infra-zilch. In the present
paper we prove the conservation of spin and orbital angular momentum for
linearized gravity on Minkowski space, and construct the analog of the helicity
array for linearized gravity.

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The categories of this paper are: math-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
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The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
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The categories of this paper are: stat
37
The categories of this paper are: supr-con
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The categories of this paper are: cond-mat
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The categories of this paper are: atom-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: eess
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The categories of this paper are: q-fin
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The categories of this paper are: patt-sol
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The categories of this paper are: chem-ph