Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spherical symmetry as a test case for unconstrained hyperboloidal
  evolution II: gauge conditions   We present numerical solutions of the hyperboloidal initial value problem for
a self-gravitating scalar field in spherical symmetry, using a variety of
standard hyperbolic slicing and shift conditions that we adapt to our
hyperboloidal setup. We work in the framework of conformal compactification,
and study both evolutions that employ the preferred conformal gauge, which
simplifies the formal singularities of our equations at null infinity, and
evolutions without this simplification. In previous work we have used a
staggered grid, which excludes null infinity, while now we include the option
of placing a gridpoint directly at null infinity. We use both the generalized
BSSN and conformal Z4 formulations of the Einstein equations, study the effect
of different gauge conditions, and show that robust evolutions are possible for
a range of choices.

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The categories of this paper are: bayes-an
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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: plasm-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: chem-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: econ
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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: math
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The categories of this paper are: acc-phys
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The categories of this paper are: q-bio
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The categories of this paper are: q-alg