Dynamical gravastars from the interaction between scalar fields and matter

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...

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Bibliographic Details
Published in:The European physical journal. C, Particles and fields Particles and fields, 2021-10, Vol.81 (10), p.1-13, Article 917
Main Authors: Cabo Montes de Oca, Alejandro, Suarez Fontanella, Duvier, Valls-Gabaud, David
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics
Astrophysics and Cosmology
Black holes
Configurations
Cosmological constant
Deposition
Elementary Particles
Expanding universe theory
General Relativity and Quantum Cosmology
Gravitational fields
Gravity
Hadrons
Heavy Ions
High Energy Physics - Theory
Measurement Science and Instrumentation
Nuclear Energy
Nuclear Physics
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Regular Article - Theoretical Physics
Scalars
String Theory
Yukawa potential
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Summary: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.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-021-09726-0