A novel black hole mimicker: a boson star and a global monopole nonminimally coupled to gravity

Abstract

A field-theoretic model for a highly compact object that mimicks a black hole is found for the gravitationally interacting system of a boson star and a global monopole which are nonminimally coupled to gravity. According to the strength of the nonlinear gravitational effects and the gravitational backreaction, three distinct coupling regimes are featured: weak, mild and strong. In the strong coupling regime we show that a repulsive monopole stabilizes an attractive boson star and the resulting configuration exhibits large energy density, large (and negative) principal pressures, large compactness, large effective potential, large local forces, and yet exhibits no event horizon. As such a composite system of a boson star and a global monopole represents a convincing microscopic candidate for a black hole mimicker.

22 pages, 18 figures; References added; matches published version

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Cited by in corpus (8)

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• Gravitational microlensing in Verlinde's emergent gravity
• Gravity of a noncanonical global monopole: conical topology and compactification
• Classical defects in higher-dimensional Einstein gravity coupled to nonlinear $\sigma$-models
• Global monopoles can change Universe's topology
• Topological inflation with graceful exit
• Nonminimally coupled topological-defect boson stars: Static solutions
• On the Thermodynamical Black Hole Stability in the Space-time of a Global Monopole in $f(R)$-Gravity