Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Using observations of millisecond pulsars to measure mass and radius of
  neutron stars and implications for equation of state of matter at high
  density   Millisecond pulsars are rapidly rotating neutron stars where general
relativity plays a strong role in the propagation of light from the neutron
star to observer. The observed X-ray pulse shapes carry information on the
mass, radius and surface shape of the neutron star. Comparison of theoretical
calculations of pulse shapes with observed pulse shapes can give useful
constraints on neutron star properties. Then comparison with calculated
properties giving an assumed equation of state (EOS) can confirm or rule out
the assumed EOS.

9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th