Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamical bar instability in a relativistic rotational core collapse   We investigate the rotational core collapse of a rapidly rotating
relativistic star by means of a 3+1 hydrodynamical simulations in conformally
flat spacetime of general relativity. We concentrate our investigation to the
bounce of the rotational core collapse, since potentially most of the
gravitational waves from it are radiated around the core bounce. The dynamics
of the star is started from a differentially rotating equilibrium star of T/W ~
0.16 (T is the rotational kinetic energy and W is the gravitational binding
energy of the equilibrium star), depleting the pressure to initiate the
collapse and to exceed the threshold of dynamical bar instability. Our finding
is that the collapsing star potentially forms a bar when the star has a
toroidal structure due to the redistribution of the angular momentum at the
core bounce. On the other hand, the collapsing star weakly forms a bar when the
star has a spheroidal structure. We also find that the bar structure of the
star is destroyed when the torus is destroyed in the rotational core collapse.
Since the collapse of a toroidal star potentially forms a bar, it can be a
promising source of gravitational waves which will be detected in advanced
LIGO.

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The categories of this paper are: q-bio
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-th
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The categories of this paper are: dg-ga
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The categories of this paper are: solv-int
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The categories of this paper are: cond-mat
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The categories of this paper are: funct-an
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The categories of this paper are: hep-lat
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The categories of this paper are: atom-ph
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The categories of this paper are: math-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: eess
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The categories of this paper are: physics
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The categories of this paper are: cmp-lg