Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: QUARK MATTER STRUCTURE IN NEUTRON STARS   For physically reasonable bulk and surface properties, quark matter has
recently been found to coexist with nuclear matter inside neutron stars in a
uniform background of electrons. The microstructure of this mixed phase starts
out with a few quark matter droplets embedded in the nuclear matter but as the
density of droplets increase towards the center of the neutron star they merge
into rods, plates and other structures. The topology, size as well as Coulomb
and surface energies of these structures depend sensitively on the
quark/nuclear matter interface tension. A major fraction of the interior of
neutron stars could consist of matter in this new phase, which would provide
new mechanisms for glitches, cooling and supernovae.

29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex