Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the minimum radius of very massive neutron stars   Prospects of establishing the radii of massive neutron stars in PSR
J1614-2230 and PSR J0740+6620 from NICER and Chandra observatories hold the
potential to constrain the equation of state (EoS) of matter to densities well
beyond those encountered in canonical stars of mass $\sim 1.4\,{\rm
M}_{\odot}$. In this work, we investigate the relation between the radii of
very massive neutron stars up to the maximum mass, $M_{\rm max}$, supported by
dense matter EoSs. Results from models with hadronic matter are contrasted with
those that include a first-order hadron-to-quark phase transition. We find that
a lower bound on $M_{\rm max}$ with an upper bound on the radius of massive
pulsars serves to rule out too soft quark matter, and an upper bound on $M_{\rm
max}$ with a lower bound on the radius of massive pulsars strongly disfavors a
transition into too-stiff quark matter appearing at low densities. The
complementary role played by radius inferences from future gravitational wave
events of inspiraling binary neutron stars is also briefly discussed.

17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg