Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Superfluid liquid crystals: pasta phases in neutron star crusts   The pasta phases predicted to occur near the inner boundary of the crust of a
neutron star resemble liquid crystals, a smectic A in the case of sheet-like
nuclei (lasagna) and the columnar phase in the case of rod-like nuclei
(spaghetti). An important difference compared with usual liquid crystals is
that the nucleons are superfluid. We develop the hydrodynamic equations for
this system and use them to study collective oscillations. Nucleon
superfluidity leads to important qualitative differences in the spectra of
these oscillations and also increases their frequencies compared with ordinary
liquid crystals. We discuss a number of directions for future work.

17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci