Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Estimating Compressibility from Maximal-mass Compact Star Observations   We investigated recent observation data of pulsar masses of PSR J0740$+$6620,
PSR J0348$+$0432, and PSR J1614$-$2230 based on the extended $\sigma$-$\omega$
model. We assumed that these pulsars are maximal mass compact star, which
suggest that the core approximation can be applied. Using the linear relations
between the microscopic and macroscopic parameters of neutron stars suggested
by this model, we estimated the values of the nucleon Landau mass and nuclear
compressibility $m_{L} = 776.0^{+38.5}_{-84.9}$~MeV and $K=242.7^{+57.2
}_{-28.0}$, respectively.

4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
19
The categories of this paper are: eess