Anisotropic ultracompact Schwarzschild star by gravitational decoupling
Jorge OvalleDepartamento de Física, Universidad Simón Bolívar, AP 89000, Caracas 1080A, VenezuelaC PosadaFaculty of Philosophy and Science, Institute of Physics and Research Centre of Theoretical Physics and Astrophysics, Silesian University in Opava, Bezručovo nám. 13, 74601 Opava, Czech RepublicZ StuchlíkFaculty of Philosophy and Science, Institute of Physics and Research Centre of Theoretical Physics and Astrophysics, Silesian University in Opava, Bezručovo nám. 13, 74601 Opava, Czech Republic
2019en
ABI
Abstract
Abstract We employ the minimal geometric deformation approach to gravitational decoupling (MGD-decoupling) in order to generate an exact anisotropic and non-uniform version of the ultracompact Schwarzschild star, or ‘gravastar’, proposed by Mazur and Mottola. This new system represents an ultracompact configuration of radius whose interior metric can be matched smoothly to a conformally deformed Schwarzschild exterior. Remarkably, the model satisfies some of the basic requirements to describe a physically acceptable stellar model, such as a positive density everywhere and decreasing monotonously from the centre, as well as a non-uniform and monotonic pressure.
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