Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Shadows of Charged and Rotating Black Holes with a Cosmological Constant   Motivated by recent astrophysical observations, we investigate the shadow
behaviors of four dimensional charged rotating black holes with a cosmological
constant. This study is made in terms of a reduced moduli space parameterized
by the charge and the rotation parameters. For a negative cosmological
constant, we analyse in some details two models dealing with Kerr-Newman and
Kerr-Sen black holes. In certain parameter regions, we find cardioid-like
(heart-shaped) shadows. For Anti de Sitter backgrounds, a comparative
discussion is provided by computing the geometrical observables and the energy
emission rate. Inspecting the effect of the cosmological constant, we obtain
conditions favoring cardioid-like shadows for (Anti) de Sitter spaces.

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The categories of this paper are: physics
34
The categories of this paper are: chem-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
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The categories of this paper are: adap-org
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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: hep-lat
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The categories of this paper are: plasm-ph
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The categories of this paper are: math
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The categories of this paper are: cmp-lg
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The categories of this paper are: acc-phys
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The categories of this paper are: nlin
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The categories of this paper are: econ