Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multi--dimensional Cosmological Radiative Transfer with a Variable
  Eddington Tensor Formalism   We present a new approach to numerically model continuum radiative transfer
based on the Optically Thin Variable Eddington Tensor (OTVET) approximation.
Our method insures the exact conservation of the photon number and flux (in the
explicit formulation) and automatically switches from the optically thick to
the optically thin regime. It scales as N logN with the number of hydrodynamic
resolution elements and is independent of the number of sources of ionizing
radiation (i.e. works equally fast for an arbitrary source function).
  We also describe an implementation of the algorithm in a Soften Lagrangian
Hydrodynamic code (SLH) and a multi--frequency approach appropriate for
hydrogen and helium continuum opacities. We present extensive tests of our
method for single and multiple sources in homogeneous and inhomogeneous density
distributions, as well as a realistic simulation of cosmological reionization.

28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg