Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gravity with a generalized conformal scalar field: Theory and solutions   We naturally extend the theory of gravity with a conformally coupled scalar
field by only requiring conformal invariance of the scalar field equation of
motion and not of the action. The classically extended theory incorporates a
scalar-Gauss-Bonnet sector and has second-order equations of motion, belonging
to the Horndeski class. Remarkably, the theory features a purely geometrical
field equation that allows for closed-form black hole solutions and cosmologies
to be easily found. These solutions permit investigations of in-vogue
scalar-Gauss-Bonnet corrections to the gravitational action without the need of
resorting to approximations or numerical methods. We discuss on the connection
to the recently formulated 4D Einstein-Gauss-Bonnet theory of gravity.

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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
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The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: math
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The categories of this paper are: patt-sol
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The categories of this paper are: q-fin
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The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph