scholarly journals Energy Loss of a Heavy Particle Near 3D Rotating Hairy Black Hole

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Jalil Naji ◽  
Hassan Saadat
Keyword(s):  
Black Hole ◽  
Energy Loss ◽  
Drag Force ◽  
Heavy Particle ◽  
Black Hole Horizon ◽  
Rotating Black Hole ◽  
Scalar Charge ◽  
Hairy Black Hole

We consider rotating black hole in 3 dimensions with a scalar charge and discuss energy loss of heavy particle moving near the black hole horizon. We find that drag force was increased by scalar charge while it was decreased due to the rotation of black hole. We also study quasnormal modes.

Energy loss of a heavy particle near a three-dimensional charged hairy black hole

2014 ◽  
Vol 92 (11) ◽  
pp. 1481-1484 ◽  
Author(s):  
J. Naji ◽  
S. Heydari ◽  
A. Amjadi
Keyword(s):  
Field Theory ◽  
Black Hole ◽  
Energy Loss ◽  
Heavy Particle ◽  
Three Dimensional ◽  
Three Dimensions ◽  
De Sitter ◽  
Conformal Field ◽  
Scalar Charge ◽  
Hairy Black Hole

In this paper, we consider a charged black hole in three dimensions with a scalar charge and discuss energy loss of a heavy particle moving near the black hole horizon. This analysis is useful when anti-de Sitter space – conformal field theory correspondence is applied. We find that an electric charge of a black hole increases the drag force but a scalar charge decreases it.

Jet-quenching parameter in 3D rotating hairy black hole background

2015 ◽  
Vol 12 (10) ◽  
pp. 1550108 ◽  
Author(s):  
Jalil Naji
Keyword(s):  
Black Hole ◽  
Rotation Parameter ◽  
Jet Quenching ◽  
Three Dimensions ◽  
Rotating Black Hole ◽  
Scalar Charge ◽  
Black Hole Background ◽  
Hairy Black Hole

In this paper, we consider rotating black hole in three dimensions with a scalar charge and discuss about the jet-quenching parameter. We find that the effect of scalar charge is decreasing and rotation parameter is increasing the value of the jet-quenching parameter.

Quark–gluon plasma corresponding to a charged rotating hairy black hole

2016 ◽  
Vol 94 (6) ◽  
pp. 574-577 ◽  
Author(s):  
J. Naji ◽  
S. Heshmatian
Keyword(s):  
Black Hole ◽  
Electric Charge ◽  
Quark Gluon Plasma ◽  
Gluon Plasma ◽  
Jet Quenching ◽  
Three Dimensions ◽  
Rotating Black Hole ◽  
Scalar Charge ◽  
Hairy Black Hole

We consider a charged rotating black hole in three dimensions with a scalar charge and discuss the jet-quenching parameter. We find that the effect of scalar charge and electric charge is to increase the jet-quenching parameter while the rotation of the black hole may decrease the value of the jet-quenching parameter. We find that viscosity of quark–gluon plasma is enhanced because of the electric and scalar charges.

BLACK HOLES HAVE LONG HAIR

2012 ◽  
Vol 21 (11) ◽  
pp. 1242003 ◽  
Author(s):  
SHAHAR HOD
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Angular Momentum ◽  
Spatial Behavior ◽  
Black Hole Horizon ◽  
Hairy Black Holes ◽  
Matter Fields ◽  
Circular Geodesic ◽  
Hairy Black Hole

The influential "no-hair" conjecture suggests that black holes may be characterized by only three conserved parameters: mass, charge and angular momentum. However, counterexamples in which the conjecture fails are well-known in the literature. In this essay we study such Einstein-matter theories in which hairy black-hole configurations have been discovered. In particular, we analyze the spatial behavior of the matter fields which reside outside the black-hole horizon. We prove a theorem which reveals the central role played by the null circular geodesic (the "photonsphere") of such hairy black holes. According to this theorem, the asymptotic decline of the hair outside the horizon cannot start before the black-hole photonsphere is crossed. We therefore conclude that hairy black holes must have long hair which extends beyond the photonsphere.

scholarly journals The Klein–Gordon equation of a rotating charged hairy black hole in (2 + 1) dimensions

2016 ◽  
Vol 31 (09) ◽  
pp. 1650057 ◽  
Author(s):  
B. Pourhassan
Keyword(s):  
Black Hole ◽  
Scalar Field ◽  
Gordon Equation ◽  
Black Hole Horizon ◽  
Massive Scalar Field ◽  
Black Hole Background ◽  
Special Cases ◽  
Klein Gordon ◽  
Hairy Black Hole ◽  
Klein Gordon Equation

In this paper, we consider the Klein–Gordon equation in a 3D charged rotating hairy black hole background to study behavior of a massive scalar field. In the general case, we find periodic-like behavior for the scalar field which may vanish at the black hole horizon or far from the black hole horizon. For the special cases of non-rotating or near horizon approximation, we find radial solution of Klein–Gordon equation in terms of hypergeometric and Kummer functions. Also for the case of uncharged black hole, we find numerical solution of the Klein–Gordon equation as periodic function which may enhance out of the black hole or vanish at horizon. We find allowed boundary conditions which may yield to the identical bosons described by scalar field.

scholarly journals Dynamics of the nonrotating and rotating black hole scalarization

2021 ◽  
Vol 103 (6) ◽  
Author(s):  
Daniela D. Doneva ◽  
Stoytcho S. Yazadjiev
Keyword(s):  
Black Hole ◽  
Rotating Black Hole
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