Regular Article - Theoretical Physics
Dynamical gravastars from the interaction between scalar fields and matter
Theoretical Physics Department, Instituto de Cibernética, Matemática y Física, Calle E, No. 309, Vedado, La Habana, Cuba
2 LERMA, CNRS UMR 8112, Observatoire de Paris, 61 Avenue de l’Observatoire, 75014, Paris, France
Accepted: 7 October 2021
Published online: 19 October 2021
Gravastars are configurations of compact singularity-free gravitational objects which are interesting alternatives to classical solutions in the strong gravitational field regime. Although there are no static star-like solutions of the Einstein–Klein–Gordon equations for real scalar fields, we show that dynamical gravastars solutions arise through the direct interaction of a scalar field with matter. Two configurations presented here show that, within the internal zone, the scalar field plays a role similar to a cosmological constant, while it decays at large distances as the Yukawa potential. Like classical gravastars, these solutions exhibit small values of the temporal metric component near a transitional radial value, although this behaviour is not determined by the de Sitter nature of the internal space-time, but rather by a slowly-varying scalar field. The scalar field-matter interaction is able to define trapping forces that rigorously confine the polytropic gases to the interior of a sphere. At the surface of these spheres, pressures generated by the field-matter interaction play the role of “walls” preventing the matter from flowing out. These solutions predict a stronger scattering of the accreting matter with respect to Schwarzschild black holes.
© The Author(s) 2021
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