scholarly journals Greybody factors for a minimally coupled scalar field in a three-dimensional Einstein-power-Maxwell black hole background

2018 ◽  
Vol 97 (8) ◽  
Author(s):  
Grigoris Panotopoulos ◽  
Ángel Rincón
Keyword(s):  
Black Hole ◽  
Scalar Field ◽  
Three Dimensional ◽  
Black Hole Background

scholarly journals Scalar field dynamics in warped AdS3 black hole background

2009 ◽  
Vol 680 (5) ◽  
pp. 500-505 ◽  
Author(s):  
Sayan K. Chakrabarti ◽  
Pulak Ranjan Giri ◽  
Kumar S. Gupta
Keyword(s):  
Black Hole ◽  
Scalar Field ◽  
Black Hole Background ◽  
Scalar Field Dynamics

A holographic superconductor model with higher correction terms

2015 ◽  
Vol 30 (13) ◽  
pp. 1550069
Author(s):  
Yan Peng ◽  
Guohua Liu
Keyword(s):  
Phase Transition ◽  
Black Hole ◽  
Scalar Field ◽  
Model Parameters ◽  
Holographic Superconductor ◽  
Transition Diagram ◽  
Holographic Superconductors ◽  
Black Hole Background ◽  
Correction Terms ◽  
Matter Fields

We study general models for holographic superconductors with higher correction terms of the scalar field in the four-dimensional AdS black hole background including the matter fields' backreaction on the metric. We explore the effects of the model parameters on the scalar condensation and find that different values of model parameters can determine the order of phase transitions. Moreover, we find that the higher correction terms provide richer physics in the phase transition diagram.

scholarly journals STRING THEORY ON THREE-DIMENSIONAL BLACK HOLES

1998 ◽  
Vol 13 (08) ◽  
pp. 1229-1262 ◽  
Author(s):  
MAKOTO NATSUUME ◽  
YUJI SATOH
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
String Theory ◽  
Three Dimensional ◽  
Matching Condition ◽  
Target Space ◽  
Black Hole Mass ◽  
Curved Space ◽  
Conformal Field ◽  
Black Hole Background

We investigate the string theory on three-dimensional black holes discovered by Bañados, Teitelboim and Zanelli in the framework of conformal field theory. The model is described by an orbifold of the [Formula: see text] WZW model. The spectrum is analyzed by solving the level matching condition and we obtain winding modes. We then study the ghost problem and show explicit examples of physical states with negative norms. We discuss the tachyon propagation and the target space geometry, which are irrelevant to the details of the spectrum. we find a self-dual T-duality transformation reversing the black hole mass. We also discuss difficulties in string theory on curved space–time and possibilities of obtaining a sensible string theory on three-dimensional black holes. This work is the first attempt to quantize a string theory in a black hole background with an infinite number of propagating modes.

scholarly journals Horizon curvature and spacetime structure influences on black hole scalarization

2021 ◽  
Vol 81 (9) ◽  
Author(s):  
Hong Guo ◽  
Xiao-Mei Kuang ◽  
Eleftherios Papantonopoulos ◽  
Bin Wang
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Scalar Field ◽  
Negative Curvature ◽  
Positive Curvature ◽  
Black Hole Background ◽  
Ads Black Holes ◽  
Spacetime Structure ◽  
Ads Spacetime

AbstractBlack hole spontaneous scalarization has been attracting more and more attention as it circumvents the well-known no-hair theorems. In this work, we study the scalarization in Einstein–scalar-Gauss–Bonnet theory with a probe scalar field in a black hole background with different curvatures. We first probe the signal of black hole scalarization with positive curvature in different spacetimes. The scalar field in AdS spacetime could be formed easier than that in flat case. Then, we investigate the scalar field around AdS black holes with negative and zero curvatures. Comparing with negative and zero cases, the scalar field near AdS black hole with positive curvature could be much easier to emerge. And in negative curvature case, the scalar field is the most difficult to be bounded near the horizon.

scholarly journals Quasinormal modes of three-dimensional rotating Hořava AdS black hole and the approach to thermal equilibrium

2020 ◽  
Vol 80 (7) ◽  
Author(s):  
Ramón Bécar ◽  
P. A. González ◽  
Eleftherios Papantonopoulos ◽  
Yerko Vásquez
Keyword(s):  
Black Hole ◽  
Scalar Field ◽  
Thermal Equilibrium ◽  
Lorentz Invariance ◽  
Three Dimensional ◽  
Quasinormal Modes ◽  
Neumann Boundary ◽  
Dirichlet Boundary Conditions ◽  
Massive Scalar Field ◽  
Decay Modes

Abstract We compute the quasinormal modes (QNMs) of a massive scalar field in the background of a rotating three-dimensional Hořava AdS black hole, and we analyze the effect of the breaking of Lorentz invariance on the QNMs. Imposing on the horizon the requirements that there are only ingoing waves and at infinity the Dirichlet boundary conditions and the Neumann boundary condition hold, we calculate the oscillatory and the decay modes of the QNMs. We find that the propagation of the scalar field is stable in this background and employing the holographic principle we find the different times of the perturbed system to reach thermal equilibrium for the various branches of solutions.

scholarly journals Quantum Decoherence in a Four-Dimensional Black Hole Background

1997 ◽  
Vol 12 (04) ◽  
pp. 243-256 ◽  
Author(s):  
John Ellis ◽  
N. E. Mavromatos ◽  
Elizabeth Winstanley ◽  
D. V. Nanopoulos
Keyword(s):  
Black Hole ◽  
Scalar Field ◽  
Density Matrix ◽  
Scalar Particle ◽  
Quantum Decoherence ◽  
Logarithmic Divergence ◽  
Four Dimensions ◽  
Black Hole Background ◽  
Order Of Magnitude ◽  
String Models

We display a logarithmic divergence in the density matrix of a scalar field in the presence of an Einstein–Yang–Mills black hole in four dimensions. This divergence is related to a previously-found logarithmic divergence in the entropy of the scalar field, which cannot be absorbed into a renormalization of the Hawking–Bekenstein entropy of the black hole. Motivated by the fact that the cutoff in this divergence varies as the latter decays, by an analysis of black holes in two-dimensional string models and by studies of D-brane dynamics in higher dimensions, we propose that the renormalization scale variable be identified with time. In this case, the logarithmic divergence we find induces a non-commutator term [Formula: see text] in the quantum Liouville equation for the time evolution of the density matrix ρ of the scalar field, leading to quantum decoherence. The order of magnitude of [Formula: see text] is μ2/M P , where μ is the mass of the scalar particle.

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