Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Scalar Field Models: From the Pioneer Anomaly to Astrophysical
  Constraints   In this work we study how scalar fields may affect solar observables, and use
the constraint on the Sun's central temperature to extract bounds on the
parameters of relevant models. Also, a scalar field driven by a suitable
potential is shown to produce an anomalous acceleration similar to the one
found in the Pioneer anomaly.

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The categories of this paper are: hep-th
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The categories of this paper are: nlin
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The categories of this paper are: q-bio
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The categories of this paper are: gr-qc
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The categories of this paper are: stat
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
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The categories of this paper are: nucl-ex
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The categories of this paper are: physics
12
The categories of this paper are: nucl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
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The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph