This paper yields a new exact solution for dense stellar objects by employing the Einstein-Maxwell system of differential equations.The established model comprises three interior layers with distinguishable equations ...This paper yields a new exact solution for dense stellar objects by employing the Einstein-Maxwell system of differential equations.The established model comprises three interior layers with distinguishable equations of state(EoSs):the polytropic EoS at the core layer,the quadratic EoS at the intermediate layer and the modified Van der Waals EoS at the envelope layer.The physical features indicate that the matter variables,metric functions and other physical conditions are viable with dense astrophysical objects.Excitingly,this model is an extension solution of the two-layered model generated by Sunzu and Lighuda.The layers are matched gently across the junctions with the care of the Reissner-Nordström exterior spacetime.Utilizing our model,star masses and radii compatible with observations and satisfactorily known objects are generated.The findings from this paper may be useful to describes purported strange stars such as SAX J1808.4-3658 and binary stars such as Vela X-1.展开更多
We establish new charged stellar models from the Einstein-Maxwell field equations for relativistic superdense objects outfitted with three layers.The core layer is described by a linear equation of state(EoS)describin...We establish new charged stellar models from the Einstein-Maxwell field equations for relativistic superdense objects outfitted with three layers.The core layer is described by a linear equation of state(EoS)describing quark matter,while the intermediate layer is described by a Bose-Einstein condensate EoS for Bose-Einstein condensate matter and the envelope layers satisfying a quadratic EoS for the neutron fluid.We have specified a new choice of the electric field and one of the metric potentials.It is interesting to note that the choice of electric field in this model can be set to vanish and we can regain earlier neutral models.Plots generated depict that the matter variables,gravitational potentials and other physical conditions are consistent with astrophysical studies.The interior layers and exterior boundary are also matched.展开更多
文摘This paper yields a new exact solution for dense stellar objects by employing the Einstein-Maxwell system of differential equations.The established model comprises three interior layers with distinguishable equations of state(EoSs):the polytropic EoS at the core layer,the quadratic EoS at the intermediate layer and the modified Van der Waals EoS at the envelope layer.The physical features indicate that the matter variables,metric functions and other physical conditions are viable with dense astrophysical objects.Excitingly,this model is an extension solution of the two-layered model generated by Sunzu and Lighuda.The layers are matched gently across the junctions with the care of the Reissner-Nordström exterior spacetime.Utilizing our model,star masses and radii compatible with observations and satisfactorily known objects are generated.The findings from this paper may be useful to describes purported strange stars such as SAX J1808.4-3658 and binary stars such as Vela X-1.
基金the University of Kwa Zulu-Natal for financial supportUniversity of Dar es Salaam+1 种基金the Ministry of EducationScience and Technology-Tanzania(MOEST)for continuous support。
文摘We establish new charged stellar models from the Einstein-Maxwell field equations for relativistic superdense objects outfitted with three layers.The core layer is described by a linear equation of state(EoS)describing quark matter,while the intermediate layer is described by a Bose-Einstein condensate EoS for Bose-Einstein condensate matter and the envelope layers satisfying a quadratic EoS for the neutron fluid.We have specified a new choice of the electric field and one of the metric potentials.It is interesting to note that the choice of electric field in this model can be set to vanish and we can regain earlier neutral models.Plots generated depict that the matter variables,gravitational potentials and other physical conditions are consistent with astrophysical studies.The interior layers and exterior boundary are also matched.
