Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Low Regularity local well-posedness for the 1+3 dimensional
  Dirac-Klein-Gordon system   We prove that the Cauchy problem for the Dirac-Klein-Gordon system of
equations in 1+3 dimensions is locally well-posed in a range of Sobolev spaces
for the Dirac spinor and the meson field. The result contains and extends the
earlier known results for the same problem. Our proof relies on the null
structure in the system, and bilinear spacetime estimates of
Klainerman-Machedon type.

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The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
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The categories of this paper are: cs
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The categories of this paper are: nucl-ex
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The categories of this paper are: eess
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The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph