Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The electrogravity transformation and global monopoles in scalar-tensor
  gravity   The electrogravity transformation is defined by an interchange of the
``active'' and ``passive'' electric parts of the Riemann tensor. Such a
transformation has been used to find new solutions that are ``dual'' to the
Kerr family of black hole spacetimes in general relativity. In such a case, the
dual solution is a similar black hole spacetime endowed with a global monopole
charge. Here, we extend this formalism to obtain solutions dual to the static,
spherically symmetric solutions of two different scalar-tensor gravity
theories. In particular, we first study the duals of the charged black hole
solutions of a four-dimensional low-energy effective action of heterotic string
theory. Next, we study dual of the Xanthopoulos-Zannias solution in Brans-Dicke
theory, which contains a naked singularity. We show that, analogous to general
relativity, in these scalar-tensor gravity theories the dual solutions are
similar to the original spacetimes, but with a global monopole charge.

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The categories of this paper are: cond-mat
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The categories of this paper are: econ
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The categories of this paper are: bayes-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: supr-con
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The categories of this paper are: q-fin
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The categories of this paper are: hep-lat
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The categories of this paper are: acc-phys
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The categories of this paper are: cs
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The categories of this paper are: eess
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ph
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The categories of this paper are: funct-an
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The categories of this paper are: q-bio