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Anisotropic strange quark star in Finch-Skea geometry and its maximum mass for non-zero strange quark mass(m_(s)≠0)

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Chinese Physics C 2023年第5期47卷 195-210页

作者： B.Das K.B.Goswami A.Saha P.K.Chattopadhyay Department of Physics Coochbehar Panchanan Barma UniversityVivekananda StreetCoochbehar 736101West BengalIndia Department of Physics Alipurduar CollegeAlipurduar 736122West BengalIndia

A class of relativistic astrophysical compact objects is analyzed in the modified Finch-Skea geometry described by the MIT bag model equation of state of interior matter,p=1/3(ρ-4B),where B is known as the bag constant.B plays an important role in determining the physical features and structure of strange *** consider the finite mass of the strange quark(m_(s)≠0) and study its effects on the stability of quark matter inside a *** note that the inclusion of strange quark mass affects the gross properties of the stellar configuration,such as maximum mass,surface red-shift,and the radius of strange quark *** apply our model physically,we consider three compact objects,namely,(ⅰ) VELA X-1,(ⅱ) 4U 1820-30,and(ⅲ) PSR J 1903+327,which are thought to be strange *** range of B is restricted from 57.55 to Bstable(MeV/fm3),for which strange matter might be stable relative to iron(^(56)Fe).However,we also observe that metastable and unstable strange matter depend on B and *** energy conditions hold well in this *** in terms of the Lagrangian perturbation of radial pressure is studied in this paper.

关键词： compact star strange star anisotropy MIT EoS strange quark mass

Bulk viscosity of interacting magnetized strange quark matter

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Nuclear Science and Techniques 2021年第10期32卷 101-109页

作者： Jian-Feng Xu School of Physics and Electrical Engineering AnYang Normal UniversityAnyang 455000China

The bulk viscosity of interacting strange quark matter in a strong external magnetic field B m with a real equation of state is *** is found that interquark interactions can significantly increase the bulk viscosity,and the magnetic field B_(m) can cause irregular oscillations in both components of the bulk viscosity,ξ||(parallel to B_(m))and ξ⊥(perpendicular to B_(m)).A comparison with non-interacting strange quark matter reveals that when B_(m) is sufficiently large,ξ⊥is more affected by interactions than ξ||.Additionally,the quasi-oscillation of the bulk viscosity with changes in density may facilitate the for-mation of magnetic ***,the resulting r-mode instability windows are in good agreement with observational data for compact stars in low-mass X-ray ***,the r-mode instability window for interacting strange quark matter in high magnetic fields has a minimum rotation frequency exceeding 1050 Hz,which may explain the observed very high spin frequency of a pulsar with V=1122 Hz.

关键词： strange quark matter Bulk viscosity Strong magnetic field strange star R-mode instability window

Maximum mass of anisotropic charged strange quark stars in a higher dimensional approach(D≥4)

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Chinese Physics C 2023年第1期47卷 271-292页

作者： A.Saha K.B.Goswamiy B.Dasz P.K.Chattopadhyayx Department of Physics Alipurduar CollegeAlipurduarWest Bengal 736122India Department of Physics Coochbehar Panchanan Barma UniversityWest Bengal 736101India

In this article,a new class of solutions of Einstein-Maxwell field equations of relativistic strange quark stars obtained in dimensions D≥4,is *** assume that the geometry of space-time is pseudo-spheroid,embedded in Euclidean space of(D-1)*** MIT bag model equation of state(henceforth EoS)is employed to study the relevant properties of strange quark *** the causal and non-negative nature of the square of the radial sound velocity(vr2),we observe that some restrictions exist on the reduced radius(b/R),where R is a parameter related to the curvature of the space-time,and b is the radius of the *** spheroidal parameter A used here defines the metric potential of the grrcomponent,which is pseudo-spheroidal in *** note that the pressure anisotropy and charge have some effects onλ.The maximum mass for a given surface density(ρs)or bag constant(B)assumes a maximum value in dimension D=5and decreases for other values of *** generalized Buchdahl limit for a higher dimensional charged star is also obeyed in this *** observe that in this model,we can predict the mass of a strange quark star using a suitable value of the electric charge(Q)and bag constant(B).Energy and stability conditions are also satisfied in this *** is also studied considering the dependence of the Lagrangian perturbation of radial pressure(Δpr)on the frequency of normal modes of *** tidal Love number and tidal de-formability are also evaluated.

关键词： strange star MIT bag model Einstein-Maxwell equations higher Dimension