EOS of Neutron Matter and Neutron Star Properties

Hassaneen, Kaled S.A.; Abou-Elsebaa, Hoda M.; Sultan, Emad A.; Abd Allah, Nabil N.

doi:10.21608/jesj.2014.196819

EOS of Neutron Matter and Neutron Star Properties

Document Type : High quality original papers

Authors

¹ Physics department, Faculty of Science, Sohag University, Sohag, Egypt. Physics department, Faculty of Science, Taif University, Taif, Saudi Arabia.

² Physics department, Faculty of Science, Sohag University, Sohag, Egypt.

10.21608/jesj.2014.196819

Abstract

The Equation of State (EOS) of pure neutron matter at zero temperature is calculated up to five saturation densities within the Brueckner theory with the inclusion of three-body forces. Three different realistic and accurate two-body forces are considered to evaluate the G-matrix effective interaction for nuclear matter. These models are the chiral N³LO, the CD-Bonn and the Argonne V18, which give quite different EOS. Two types of three-body forces are included to the effective
interaction, which might be important at densities several times that of nuclear matter density. Using a microscopic EOS for pure neutron matter, static properties of non-rotating neutron stars such as masses and radii are evaluated. The resulting maximum masses of neutron stars using different interactions near 2Mʘ are found to be in reasonable agreement with the measured ones PSR J1614−2230 (with M_max = 1.97 ± 0.04 Mʘ) and PSR J0348+0432 (with Mmax = 2.01 ± 0.04 Mʘ).

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