Comparative study of rotating neutron stars: Rastall-anisotropy vs chaotic magnetic fields
Muhammad Lawrence Pattersons (a*), Freddy Permana Zen (a,b), Getbogi Hikmawan (a,b)

a) Theoretical High Energy Physics Group, Department of Physics, Institut Teknologi Bandung, Jl. Ganesha 10, Bandung, 40132, Indonesia
*m.pattersons[at]proton.me
b) Indonesia Center for Theoretical and Mathematical Physics (ICTMP), Institut Teknologi Bandung, Jl. Ganesha 10, Bandung, 40132, Indonesia

Abstract

We compare two theoretical frameworks for studying slowly rotating neutron stars: anisotropic configurations in Rastall gravity and models incorporating chaotic magnetic fields in general relativity. Employing a consistent equation of state and the Hartle-Thorne formalism, we investigate how each approach influences key physical properties such as rotational mass and moment of inertia. Our results indicate that Rastall gravity combined with anisotropy can increase the maximum mass of neutron stars, while chaotic magnetic fields have a pronounced impact on stellar deformation. These findings provide complementary perspectives on the structure of neutron stars under extreme conditions.

Keywords: Anisotropy, Chaotic magnetic fields, Rastall gravity, Rotating neutron stars

Topic: Theory, Nuclear, and Particle Physics