Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photospheric Emission from Collapsar Jets in 3D Relativistic
  Hydrodynamics   We explore the photospheric emission from a relativistic jet breaking out
from a massive stellar envelope based on relativistic hydrodynamical
simulations and post-process radiation transfer calculations in three
dimensions. To investigate the impact of three-dimensional (3D) dynamics on the
emission, two models of injection conditions are considered for the jet at the
center of the progenitor star: one with periodic precession and another without
precession. We show that structures developed within the jet due to the
interaction with the stellar envelope, as well as due to the precession, have a
significant imprint on the resulting emission. Particularly, we find that the
signature of precession activity by the central engine is not smeared out and
can be directly observed in the light curve as a periodic signal. We also show
non-thermal features, which can account for observations of gamma-ray bursts,
are produced in the resulting spectra, even though only thermal photons are
injected initially and the effect of non-thermal particles is not considered.

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The categories of this paper are: hep-th
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The categories of this paper are: bayes-an
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The categories of this paper are: ao-sci
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The categories of this paper are: nlin
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The categories of this paper are: math
16
The categories of this paper are: stat
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The categories of this paper are: solv-int
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The categories of this paper are: q-fin
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The categories of this paper are: q-alg
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The categories of this paper are: nucl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: adap-org
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The categories of this paper are: q-bio
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The categories of this paper are: hep-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-ex