Rotational mass of anisotropic neutron stars within Rastall gravity

Abstract

Due to rotation, the mass correction of neutron stars arises and causes the rotational mass to be larger than the static mass. In this work, we extend the formulation of the rotational mass of anisotropic neutron stars within Rastall gravity. We apply numerical simulation on the formulation we obtained. We refer to mass of J0740+6620, GW170817, and GW190814 as the mass constraints of the neutron stars. For the free parameters, we use three values of Rastall's parameter, i.e. $\lambda =0.00019$, $\lambda =0.00038$, $\lambda =0.00071$; and three values of anisotropic strength, i.e. $\zeta =-1.15$, $\zeta =-1.50$, and $\zeta =-2.00$. We have found that both $\lambda$ and $\zeta$ impact on the increment of the NS's rotational mass within the compact regimes, and also impact on the decrease of the NS's rotational mass within the loose regimes. All mass constraints are satisfied by the NS with $\zeta =-2.00$. In term of the moment of inertia $I$ of the neutron stars, all numerical results match with the constraint range which is based on radio observations of heavy pulsars; while in term of the angular velocity of the stars relative to the distant observers $\Omega$, the mass correction $\delta M$ significantly increases when $\Omega$ increases.

arXiv comment22 pages, 4 figures, 3 tables, accepted for publication in Physics Letters B

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