Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Disformal Transition of a Black Hole to a Wormhole in Scalar-Tensor
  Horndeski Theory   We consider disformal transformations in a subclass of Horndeski theory in
which a scalar field is kinetically coupled to the Einstein tensor. We apply a
disformal transformation on a seed hairy black hole solution of this theory and
we show that there is a transition of a black hole to a wormhole. We also show
that the null energy condition is violated in the wormhole configuration and we
study the stability of the wormhole solution by calculating the time evolution
of scalar perturbations in this geometry.

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The categories of this paper are: cmp-lg
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The categories of this paper are: alg-geom
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The categories of this paper are: math-ph
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The categories of this paper are: stat
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The categories of this paper are: cond-mat
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The categories of this paper are: q-fin
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The categories of this paper are: ao-sci
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The categories of this paper are: solv-int
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The categories of this paper are: adap-org
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The categories of this paper are: dg-ga
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The categories of this paper are: mtrl-th
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The categories of this paper are: chem-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: eess