Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Self-similar pressure oscillations in neutron star envelopes as probes
  of neutron star structure   We study eigenmodes of acoustic oscillations of high multipolarity l ~ 100 -
1000 and high frequency (~100 kHz), localized in neutron star envelopes. We
show that the oscillation problem is self-similar. Once the oscillation
spectrum is calculated for a given equation of state (EOS) in the envelope and
given stellar mass M and radius R, it can be rescaled to a star with any M and
R (but the same EOS in the envelope). For l>300 the modes can be subdivided
into the outer and inner ones. The outer modes are mainly localized in the
outer envelope. The inner modes are mostly localized near the neutron drip
point, being associated with the softening of the EOS after the neutron drip.
We calculate oscillation spectra for the EOSs of cold-catalyzed and accreted
matter and show that the spectra of the inner modes are essentially different.
A detection and identification of high-frequency pressure modes would allow one
to infer M and R and determine also the EOS in the envelope (accreted or
ground-state) providing thus a new and simple method to explore the main
parameters and internal structure of neutron stars.

22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th