Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Diffusion of Neutrinos in Proto-Neutron Star Matter with Quarks   Neutrino opacities important in the evolution of a proto-neutron star
containing quark matter are studied. The results for pure quark matter are
compared with limiting expressions previously derived, and are generalized to
the temperatures, neutrino degeneracies and lepton contents encountered in a
proto-neutron star's evolution. We find that the appearance of quarks in
baryonic matter drastically reduces the neutrino opacity for a given entropy,
the reduction being sensitive to the thermodynamic conditions in the mixed
quark-hadron phase.

2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex