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Relativistic compact stars with charged anisotropic matter

Chinese Physics C 2018年第5期42卷 104-116页

作者： S.K.Maurya Ayan Banerjee Phongpichit Channuie Department of Mathematical & Physical Sciences College of Arts & Science University of Nizwa Department of Mathematics Faculty of Applied Sciences Durban University of Technology School of Science Walailak University

In this article, we perform a detailed theoretical analysis of new exact solutions with anisotropic fluid distribution of matter for compact objects subject to hydrostatic equilibrium. We present a family solution to the Einstein-Maxwell equations describing a spherically symmetric, static distribution of a fluid with pressure *** implement an embedding class one condition to obtain a relation between the metric functions. We generalize the properties of a spherical star with hydrostatic equilibrium using the generalised Tolman-Oppenheimer-Volkoff(TOV)equation. We match the interior solution to an exterior Reissner-Nordstr?m one, and study the energy conditions,speed of sound, and mass-radius relation of the star. We also show that the obtained solutions are compatible with observational data for the compact object Her X-1. Regarding our results, the physical behaviour of the present model may serve for the modeling of ultra compact objects.

关键词： Class I spacetime exact solutions compact objects electromagnetic mass models

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An approximate Kerr-Newman-like metric endowed with a magnetic dipole and mass quadrupole

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Communications in Theoretical Physics 2024年第8期76卷 124-138页

作者： Francisco Frutos-Alfaro Space Research Center and School of Physics University of Costa RicaSan PedroSan JoseCosta Rica

Approximate all-terrain spacetimes for astrophysical applications are presented. The metrics possess five relativistic multipole moments, namely, mass, rotation, mass quadrupole, charge,and magnetic dipole moment. All these spacetimes approximately satisfy the Einstein-Maxwell field equations. The first metric is generated using the Hoenselaers-Perjés method from given relativistic multipoles. The second metric is a perturbation of the Kerr-Newman metric, which makes it a relevant approximation for astrophysical calculations. The last metric is an extension of the Hartle-Thorne metric that is important for obtaining internal models of compact objects perturbatively. The electromagnetic field is calculated using Cartan forms for locally non-rotating observers. These spacetimes are relevant for inferring properties of compact objects from astrophysical observations. Furthermore, the numerical implementations of these metrics are straightforward, making them versatile for simulating potential astrophysical applications.

关键词： Gravitation Einstein-Maxwell equations compact objects

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Durgapal IV model considering the minimal geometric deformation approach

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Chinese Physics C 2020年第10期44卷 152-168页

作者： Francisco Tello-Ortiz Ángel Rincon Piyali Bhar Y.Gomez-Leyton Departamento de Física Facultad de ciencias básicasUniversidad de AntofagastaCasilla 170AntofagastaChile Instituto de Física Pontificia Universidad Católica de ValparaísoAvenida Brasil 2950Casilla 4059ValparaísoChile Department of Mathematics Government General Degree CollegeSingurHooghlyWest Bengal 712409India Departamento de Física Universidad Católica del NorteAv.Angamos 0610AntofagastaChile

The present article reports the study of local anisotropic effects on Durgapal's fourth model in the context of gravitational decoupling via the minimal geometric deformation *** achieve this,the most general equation of state relating the components of the−θsector is imposed to obtain the decoupler function f(r).In addition,certain properties of the obtained solution,such as the behavior of the salient material content threading the stellar interior;causality and energy conditions;hydrostatic balance through the modified Tolman−Oppenheimer−Volkoff conservation equation and stability mechanism against local anisotropies using the adiabatic index;sound velocity of the pressure waves;convection factor;and the Harrison−Zeldovich−Novikov procedure,are investigated to check whether the model is physically admissible or *** the stability analysis,it is found that the model presents unstable regions when the sound speed of the pressure waves and convection factor are used in distinction with the adiabatic index and Harrison−Zeldovich−Novikov *** produce a more realistic picture,the numerical data for some known compact objects were determined and different values of the parameterαwere considered to compare with the GR case,i.e.,α=0.

关键词： compact objects anisotropy gravitational decoupling

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Repeating fast radio bursts from collapses of the crust of a strange star

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The Innovation 2021年第4期2卷 5-10页

作者： Jinjun Geng Bing Li Yongfeng Huang Purple Mountain Observatory Chinese Academy of SciencesNanjing 210023China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Particle Astrophysics Division Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China School of Astronomy and Space Science Nanjing UniversityNanjing 210023China Key Laboratory of Modern Astronomy and Astrophysics(Nanjing University) Ministry of EducationNanjing 210023China

Strange stars(SSs)are compact objects made of deconfined *** is hard to distinguish SSs from neutron stars as a thin crust composed of normal hadronic matter may exist and obscure the whole surface of the *** we suggest that the intriguing repeating fast radio bursts(FRBs)are produced by the intermittent fractional collapses of the crust of an SS induced by refilling of materials accreted from its low-mass *** periodic/sporadic/clustered temporal behaviors of FRBs could be well understood in our ***,the periodicity is attributed to the modulation of accretion rate through the disk *** account for a~16-day periodicity of the repeating FRB source of 180916.J0158+65,a Shakura-Sunyaev disk with a viscosity parameter of 0.004 and an accretion rate of 3×10^(16)gs^(-1) is *** scenario,if favored by future observations,will serve as indirect evidence for the strange quark matter hypothesis.

关键词： accretion compact objects radio bursts degenerate matter low-mass X-ray binary stars

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