Work

Slowly rotating anisotropic neutron stars with a parametrized equation of state

Year: 2024

Type: article

Abstract: In this work, we study the impact of anisotropy on slowly rotating neutron stars by extending the Hartle--Thorne formalism in general relativity to include anisotropy in pressure up to second order in the angular velocity. We assess the presence of anisotropy within the star by employing a quasi-local relationship. Our results show that the ratio between the gravitational mass of the fastest anisotropic rotating configurations and the corresponding nonrotating ones ranges from 1.12 to 1.25, consistent with recent findings. We develop universal relations for the moment of inertia, binding energy, and quadrupole moment of the rotating stars. These relations are tested against various equations of state, which were modeled by a piecewise polytropic function with continuous sound speed.

Source: Physical review. D/Physical review. D.

DOI: 10.1103/physrevd.110.103004

Authors: L. M. Becerra, E. A. Becerra-Vergara, F. D. Lora-Clavijo

Institutions: Universidad Mayor, Universidad Industrial de Santander

Language: English

Topic: Pulsars and Gravitational Waves Research

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: Universidad Industrial de Santander, Vicerrectoría de Investigación y Extensión, Universidad Industrial de Santander

Award: G4327172468