Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Charge Screening at First Order Phase Transitions and Hadron - Quark
  Mixed Phase   Possibility of structured mixed phases at first order phase transitions in
neutron stars is re-examined by taking into account charge screening and
surface effects. Transition from the hadron $npe$ phase to the quark phase is
studied. Two possibilities, the mixed phase and two separate phases given by
the double-tangent (Maxwell) construction are considered. Inhomogeneous
profiles of the electric potential and their contribution to the energy are
analytically calculated. The electric field configurations determine the
droplet size and the geometry of structures.

33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
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The categories of this paper are: chem-ph
1
The categories of this paper are: cs