Programme

O.13 -- Oral, VCTP-47

Date: Thursday, 4 August 2022

Time: 11:35 - 12:00

Spin symmetry energy and equation of state of spin-polarized neutron star matter

Nguyen Hoang Dang Khoa (1), Ngo Hai Tan (2), Dao Tien Khoa (3)

(1) University of Science and Technology of Hanoi; (2) Phenikaa University; (3) Institute of Nuclear Science and Technology

The equation of state (EOS) of spin-polarized nuclear matter (NM) is studied within the Hartree-Fock (HF) formalism using the realistic density-dependent nucleon-nucleon interaction. The present HF study shows a strong correlation between the spin symmetry energy and nuclear symmetry energy over the whole range of baryon densities. The important contribution of the spin symmetry energy to the EOS of the spin-polarized NM is found to be comparable with that of the nuclear symmetry energy to the EOS of the isospin-polarized or asymmetric (neutron-rich) NM. Based on the HF energy density, the EOS of the spin-polarized (β-stable) npeμ matter is obtained for the determination of the macroscopic properties of neutron stars (NS). A realistic density dependence of the spin-polarized fraction has been suggested to explore the impact of the spin symmetry energy on the gravitational mass M and radius R, as well as the tidal deformability of NS. Based on the empirical constrains inferred from a coherent Bayesian analysis of gravitational wave signals of the NS merger GW170817 and the observed masses of the heaviest pulsars, the present study shows the strong impact of the spin symmetry energy W , nuclear symmetry energy S, and nuclear incompressibility K on the EOS of nucleonic matter in magnetar.

Presenter: Ngo Hai Tan