Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Three-dimensional hydrodynamic simulations of the combustion of a
  neutron star into a quark star   We present three-dimensional numerical simulations of turbulent combustion
converting a neutron star into a quark star. Hadronic matter, described by a
micro-physical finite-temperature equation of state, is converted into strange
quark matter. We assume this phase, represented by a bag-model equation of
state, to be absolutely stable. Following the example of thermonuclear burning
in white dwarfs leading to Type Ia supernovae, we treat the conversion process
as a potentially turbulent deflagration. Solving the non-relativistic Euler
equations using established numerical methods we conduct large eddy simulations
including an elaborate subgrid scale model, while the propagation of the
conversion front is modeled with a level-set method. Our results show that for
large parts of the parameter space the conversion becomes turbulent and
therefore significantly faster than in the laminar case. Despite assuming
absolutely stable strange quark matter, in our hydrodynamic approximation an
outer layer remains in the hadronic phase, because the conversion front stops
when it reaches conditions under which the combustion is no longer exothermic.

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The categories of this paper are: alg-geom
18
The categories of this paper are: econ
2
The categories of this paper are: math
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
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The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
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The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
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The categories of this paper are: eess
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The categories of this paper are: plasm-ph
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The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph