Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Isospin dependence of entrainment in superfluid neutron stars in a
  relativistic model   We study the entrainment effect between superfluid neutrons and charge
neutral fluid (called the proton fluid) which is made of protons and electrons
in neutron star interior within the two fluid formalism and using a
relativistic model where baryon-baryon interaction is mediated by the exchange
of $\sigma$, $\omega$ and $\rho$ mesons. This model of strong interaction also
includes scalar self interactions. The entrainment matrix and entrainment
parameter are calculated using the parameter sets of Glendenning (GL) and
another non-linear (NL3) interaction. The inclusion of $\rho$ mesons strongly
influences the entrainment parameter ($\epsilon_{mom}$) in a superfluid neutron
star. The entrainment parameter is constant at the core and drops rapidly at
the surface. It takes values within the physical range.

16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg