• JASON M MKENYELEYE

      Articles written in Pramana – Journal of Physics

    • Generalised charged anisotropic quark star models

      ABDULRAHIM T ABDALLA JEFTA M SUNZU JASON M MKENYELEYE

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      We find new stellar models to the field equations for charged anisotropic spheres. We use linear quarkequation of state for strange quarkmatter.We choose a new form of pressure anisotropy as a rational function. In ourmodel, we regain previous isotropic and anisotropic stellar models as specific cases. Isotropic models regained arethose found by Komathiraj and Maharaj, Mak and Harko, and Misner and Zapolsky. Anisotropic models regainedinclude the performance by Maharaj, Sunzu and Ray; and Sunzu and Danford. We indicate that our model meetsthe stability and energy conditions. We also generate stellar masses consistent with observations.

    • Charged anisotropic models via embedding

      ALBERTO K MATHIAS SUNIL D MAHARAJ JEFTA M SUNZU JASON M MKENYELEYE

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      We generate exact solutions to the Einstein–Maxwell field equations by analysing the embedding condition. We obtain a relationship between gravitational potentials that helps to solve the embedding condition and integrate the field equations. Our choice of the measure of anisotropy and electric field are physically realistic. Our model contains several previously known solutions as special cases. These include the investigations of interior Schwarzchild metric, Finch and Skea, Hansraj and Maharaj, Feroze and Siddiqui, and Manjonjo, Maharaj andMoopanar.We also describe the structure and properties of the relativistic star by including graphical representations. Our analysis shows that the body is stable, all energy conditions are satisfied, the regularity condition is not violated, forces under equilibrium condition are balanced, all matter variables are well behaved and the matching conditions are satisfied at the boundary of the relativistic star.

    • Quark star models with logarithmic anisotropy

      MAHAMUDU JUMA JASON M MKENYELEYE JEFTA M SUNZU

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      New models for the charged anisotropic stellar object were generated using the Einstein–Maxwell field equations. A new choice of pressure anisotropy in logarithmic form was used to generate a quark star model. Anisotropic and isotropic models were regained as a special case.We regained anisotropic models found by Maharaj, Sunzu and Ray; Abdalla, Sunzu and Mkenyeleye; and Sunzu and Danford. The isotropic models regained include the performance by Mak and Harko, and Maharaj and Komathiraj. Physical analysis showed that matter variables and the gravitational potentials are well behaved. Our model does satisfy the energy conditions and stability condition.

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