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

作者：Marunovic Anja^*; Murkovic Miljenko

来源：Classical and Quantum Gravity, 2014, 31(4): 045010.

DOI：10.1088/0264-9381/31/4/045010

• black holemimicker
• compact object
• modified gravity
• nonminimal coupling
• global monopole

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.

• 出版日期2014-2