Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Models of Anisotropic Self-Gravitating Source in Einstein-Gauss-Bonnet
  Gravity   In this paper, we have studied gravitational collapse and expansion of
non-static anisotropic fluid in $5D$ Einstein Gauss-Bonnet gravity. For this
purpose, the field equations have been modeled and evaluated for the given
source and geometry. The two metric functions have been expressed in terms of
parametric form of third metric function. We have examined the range of
parameter $\beta$ (appearing in the form of metric functions) for which
$\Theta$ the expansion scalar becomes positive/negative leads to
expansion/collapse of the source. The trapped surface condition has been
explored by using definition of Misner-Sharp mass and auxiliary solutions. The
auxiliary solutions of the field equations involve a single function which
generates two types of anisotropic solutions. Each solution can be represented
in term of arbitrary function of time, this function has been chosen
arbitrarily to fit the different astrophysical time profiles. The existing
solutions forecast gravitational expansion and collapse depending on the choice
of initial data. In this case, it has been investigated wall to wall collapse
of spherical source. The dynamics of the spherical source has been observed
graphically with the effects of Gauss-Bonnet coupling term $\alpha$ in the case
of collapse and expansion. The energy conditions are satisfied for the specific
values of parameters in the both solutions, this implies that the solutions are
physically acceptable.

18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
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The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
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The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
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The categories of this paper are: q-bio
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The categories of this paper are: nlin
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-th
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The categories of this paper are: solv-int
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The categories of this paper are: funct-an