Do collapsed boson stars result in new types of black holes?

1997 ◽  
Vol 14 (11) ◽  
pp. 3131-3134 ◽  
Author(s):  
Igor Peña ◽  
Daniel Sudarsky
Keyword(s):  
Black Holes ◽  
Boson Stars

GR-AMRVAC code applications: accretion onto compact objects, boson stars versus black holes

2016 ◽  
Vol 33 (15) ◽  
pp. 155010 ◽  
Author(s):  
Z Meliani ◽  
P Grandclément ◽  
F Casse ◽  
F H Vincent ◽  
O Straub ◽  
...  
Keyword(s):  
Black Holes ◽  
Compact Objects ◽  
Boson Stars

scholarly journals Spinning boson stars and hairy black holes with nonminimal coupling

2018 ◽  
Vol 27 (11) ◽  
pp. 1843009 ◽  
Author(s):  
Carlos A. R. Herdeiro ◽  
Eugen Radu
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Scalar Field ◽  
Coupling Parameter ◽  
Nonminimal Coupling ◽  
Boson Stars ◽  
Hairy Black Holes ◽  
Black Hole Solutions ◽  
Hairy Black Hole ◽  
Coupled Theory

We obtain spinning boson star solutions and hairy black holes with synchronized hair in the Einstein–Klein–Gordon model, wherein the scalar field is massive, complex and with a nonminimal coupling to the Ricci scalar. The existence of these hairy black holes in this model provides yet another manifestation of the universality of the synchronization mechanism to endow spinning black holes with hair. We study the variation of the physical properties of the boson stars and hairy black holes with the coupling parameter between the scalar field and the curvature, showing that they are, qualitatively, identical to those in the minimally coupled case. By discussing the conformal transformation to the Einstein frame, we argue that the solutions herein provide new rotating boson star and hairy black hole solutions in the minimally coupled theory, with a particular potential, and that no spherically symmetric hairy black hole solutions exist in the nonminimally coupled theory, under a condition of conformal regularity.

scholarly journals SUPERMASSIVE BLACK HOLES OR BOSON STARS? HAIR COUNTING WITH GRAVITATIONAL WAVE DETECTORS

2006 ◽  
Vol 15 (12) ◽  
pp. 2209-2216 ◽  
Author(s):  
EMANUELE BERTI ◽  
VITOR CARDOSO
Keyword(s):  
Black Holes ◽  
Laser Interferometer ◽  
Kerr Black Hole ◽  
Space Time ◽  
Multipole Moments ◽  
Boson Stars ◽  
Laser Interferometer Space Antenna ◽  
Kerr Space ◽  
Oscillation Frequencies ◽  
Rule Out

The evidence for supermassive Kerr black holes in galactic centers is strong and growing, but only the detection of gravitational waves will convincingly rule out other possibilities to explain the observations. The Kerr space–time is completely specified by the first two multipole moments: mass and angular momentum. This is usually referred to as the "no-hair theorem," but it is really a "two-hair" theorem. If general relativity is the correct theory of gravity, the most plausible alternative to a supermassive Kerr black hole is a rotating boson star. Numerical calculations indicate that the space–time of rotating boson stars is determined by the first three multipole moments ("three-hair theorem"). The Laser Interferometer Space Antenna (LISA) could accurately measure the oscillation frequencies of these supermassive objects. We propose to use these measurements to "count their hair," unambiguously determining their nature and properties.

scholarly journals Constraining black holes with light boson hair and boson stars using epicyclic frequencies and quasiperiodic oscillations

2017 ◽  
Vol 95 (12) ◽  
Author(s):  
Nicola Franchini ◽  
Paolo Pani ◽  
Andrea Maselli ◽  
Leonardo Gualtieri ◽  
Carlos A. R. Herdeiro ◽  
...  
Keyword(s):  
Black Holes ◽  
Boson Stars ◽  
Quasiperiodic Oscillations

scholarly journals Inflation inside Non-Topological Defects and Scalar Black Holes

Symmetry ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 2
Author(s):  
Yves Brihaye ◽  
Felipe Console ◽  
Betti Hartmann
Keyword(s):  
Black Holes ◽  
Topological Defects ◽  
Einstein Gravity ◽  
Boson Stars ◽  
Regular Solutions ◽  
The Core ◽  
Simple Set ◽  
Scalar Hair ◽  
Set Up ◽  
Complex Valued

In this paper, we demonstrate that a phenomenon described as topological inflation, during which inflation occurs inside the core of topological defects, has a non–topological counterpart. This appears in a simple set-up containing Einstein gravity coupled minimally to an electromagnetic field as well as a self-interacting, complex valued scalar field. The U(1) symmetry of the model is unbroken and leads to the existence of globally regular solutions, so-called boson stars, that develop a horizon for sufficiently strong gravitational coupling. We also find that the same phenomenon exists for black holes with scalar hair.

scholarly journals Phase diagram of the charged black hole bomb system

2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
Alex Davey ◽  
Oscar J. C. Dias ◽  
Paul Rodgers
Keyword(s):  
Phase Diagram ◽  
Black Holes ◽  
Black Hole ◽  
Charged Black Hole ◽  
Energy Conditions ◽  
Boson Stars ◽  
Horizon Radius ◽  
Hairy Black Holes ◽  
Surface Tensor ◽  
Quasilocal Mass

Abstract We find the phase diagram of solutions of the charged black hole bomb system. In particular, we find the static hairy black holes of Einstein-Maxwell-Scalar theory confined in a Minkowski box. We impose boundary conditions such that the scalar field vanishes at and outside a cavity of constant radius. These hairy black holes are asymptotically flat with a scalar condensate floating above the horizon. We identify four critical scalar charges which mark significant changes in the qualitative features of the phase diagram. When they coexist, hairy black holes always have higher entropy than the Reissner-Nordström black hole with the same quasilocal mass and charge. So hairy black holes are natural candidates for the endpoint of the superradiant/near-horizon instabilities of the black hole bomb system. We also relate hairy black holes to the boson stars of the theory. When it has a zero horizon radius limit, the hairy black hole family terminates on the boson star family. Finally, we find the Israel surface tensor of the box required to confine the scalar condensate and that it can obey suitable energy conditions.

scholarly journals Chaotic lensing around boson stars and Kerr black holes with scalar hair

2016 ◽  
Vol 94 (10) ◽  
Author(s):  
P. V. P. Cunha ◽  
J. Grover ◽  
C. Herdeiro ◽  
E. Radu ◽  
H. Rúnarsson ◽  
...  
Keyword(s):  
Black Holes ◽  
Boson Stars ◽  
Scalar Hair ◽  
Kerr Black Holes

scholarly journals Can boson stars supplant black holes?

2005 ◽  
Vol 24 ◽  
pp. 241-246 ◽  
Author(s):  
F Siddhartha Guzmán
Keyword(s):  
Black Holes ◽  
Boson Stars
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