scholarly journals No-short scalar hair theorem for spinning acoustic black holes in a photon-fluid model

2021 ◽  
Vol 104 (10) ◽  
Author(s):  
Shahar Hod
Keyword(s):  
Black Holes ◽  
Fluid Model ◽  
Scalar Hair ◽  
Acoustic Black Holes

scholarly journals Growth of accretion driven scalar hair around Kerr black holes

2021 ◽  
Vol 103 (4) ◽  
Author(s):  
Jamie Bamber ◽  
Katy Clough ◽  
Pedro G. Ferreira ◽  
Lam Hui ◽  
Macarena Lagos
Keyword(s):  
Black Holes ◽  
Scalar Hair ◽  
Kerr Black Holes

scholarly journals Transient scalar hair for nearly extreme black holes

2019 ◽  
Vol 1 (3) ◽  
Author(s):  
Lior M. Burko ◽  
Gaurav Khanna ◽  
Subir Sabharwal
Keyword(s):  
Black Holes ◽  
Scalar Hair ◽  
Extreme Black Holes

scholarly journals Supersonic velocities in noncommutative acoustic black holes

2012 ◽  
Vol 85 (2) ◽  
Author(s):  
M. A. Anacleto ◽  
F. A. Brito ◽  
E. Passos
Keyword(s):  
Black Holes ◽  
Supersonic Velocities ◽  
Acoustic Black Holes

scholarly journals Quasi-normal modes of electromagnetic perturbations of four-dimensional topological black holes with scalar hair

2006 ◽  
Vol 2006 (10) ◽  
pp. 006-006 ◽  
Author(s):  
George Koutsoumbas ◽  
Suphot Musiri ◽  
Eleftherios Papantonopoulos ◽  
George Siopsis
Keyword(s):  
Black Holes ◽  
Normal Modes ◽  
Scalar Hair ◽  
Electromagnetic Perturbations

scholarly journals New no‐scalar‐hair theorem for black holes

1996 ◽  
Vol 37 (5) ◽  
pp. 2346-2351 ◽  
Author(s):  
Alberto Saa
Keyword(s):  
Black Holes ◽  
Scalar Hair

Sound absorption based on Micro-perforated panels and Acoustic Black Hole principle

2021 ◽  
Vol 263 (6) ◽  
pp. 548-555
Author(s):  
Xiaoqi Zhang ◽  
Li Cheng
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Sound Absorption ◽  
Practical Application ◽  
Inner Radius ◽  
Simulation Results ◽  
Structural Configurations ◽  
Acoustic Black Holes ◽  
Sound Reduction ◽  
Bending Wave

Acoustic black holes (ABHs) have been so far investigated mainly for bending wave ma-nipulation in mechanical structures such as beams or plates. The investigations on ABHs for sound wave manipulation, referred to as Sonic black holes (SBHs) are scarce. Existing SBH structure for sound reduction in air is typically formed by putting a set of rings inside a duct wall with decreasing inner radius according to a power law. As such, the structure is very complex and difficult to be practically realized, which hampers the practical application of SBHs for sound reduction. This study explores the possibilities of achieving SBH effects using other types of structural configurations. In particular, micro-perforated panels are proposed to be introduced into the conventional SBH structure, and the simulation results show that the new formed SBH structure is simpler in configuration in terms of number of rings and more efficient in terms of sound energy trapping and dissipation.

scholarly journals Kerr black holes with synchronised scalar hair and higher azimuthal harmonic index

2019 ◽  
Vol 792 ◽  
pp. 436-444 ◽  
Author(s):  
Jorge F.M. Delgado ◽  
Carlos A.R. Herdeiro ◽  
Eugen Radu
Keyword(s):  
Black Holes ◽  
Harmonic Index ◽  
Scalar Hair ◽  
Kerr Black Holes
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