scholarly journals Absorption Cross Section and Decay Rate of Dilatonic Black Strings

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Huriye Gürsel ◽  
İzzet Sakallı
Keyword(s):  
Scalar Field ◽  
Decay Rate ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Gordon Equation ◽  
Absorption Cross ◽  
Black String ◽  
Yang Mills ◽  
Klein Gordon ◽  
Analytical Expressions

We studied in detail the propagation of a massive tachyonic scalar field in the background of a five-dimensional (5D) Einstein–Yang–Mills–Born–Infeld–dilaton black string: the massive Klein–Gordon equation was solved, exactly. Next we obtained complete analytical expressions for the greybody factor, absorption cross section, and decay rate for the tachyonic scalar field in the geometry under consideration. The behaviors of the obtained results are graphically represented for different values of the theory’s free parameters. We also discuss why tachyons should be used instead of ordinary particles for the analytical derivation of the greybody factor of the dilatonic 5D black string.

scholarly journals ABSORPTION CROSS SECTION OF A RN BLACK HOLE

2009 ◽  
Vol 18 (01) ◽  
pp. 1-11 ◽  
Author(s):  
R. SINI ◽  
V. C. KURIAKOSE
Keyword(s):  
Black Hole ◽  
Scalar Field ◽  
Event Horizon ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Hawking Temperature ◽  
Absorption Cross ◽  
Charged Scalar ◽  
Matter Waves ◽  
Charged Scalar Field

The behavior of a charged scalar field in the RN black hole space–time is studied using the WKB approximation. In the present work, it is assumed that matter waves can be reflected from the event horizon. Using this effect, the Hawking temperature and the absorption cross section for an RN black hole placed in a charged scalar field are calculated. The absorption cross section σabs is found to be inversely proportional to the square of the Hawking temperature of the black hole.

ABSORPTION CROSS-SECTION AND EMISSION SPECTRA OF SCHWARZSCHILD BLACK HOLE IN DIRAC FIELD

2008 ◽  
Vol 23 (33) ◽  
pp. 2867-2879 ◽  
Author(s):  
R. SINI ◽  
V. C. KURIAKOSE
Keyword(s):  
Black Hole ◽  
Scalar Field ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Emission Spectra ◽  
Dirac Field ◽  
Absorption Cross ◽  
Schwarzschild Black Hole ◽  
Matter Waves ◽  
Black Hole Spacetime

The behavior of a Dirac field in a Schwarzschild black hole spacetime is studied. In this work the Hawking temperature and the absorption cross-section for Schwarzschild black hole placed in Dirac field are calculated, taking into consideration the matter waves reflected from the event horizon. The absorption cross-section σ abs in Dirac field is found to be ⅛ of absorption cross-section in scalar field. The emission spectra of Schwarzschild black hole placed in an environment of Dirac field is also obtained.

scholarly journals ABSORPTION CROSS-SECTION OF REISSNER–NORDSTROM AND SCHWARZSCHILD–DE SITTER EXTREMAL BLACK HOLE

2008 ◽  
Vol 23 (24) ◽  
pp. 4011-4021 ◽  
Author(s):  
R. SINI ◽  
NIJO VARGHESE ◽  
V. C. KURIAKOSE
Keyword(s):  
Black Holes ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Wave Functions ◽  
Extremal Black Hole ◽  
Absorption Cross ◽  
Scalar Wave ◽  
De Sitter ◽  
Klein Gordon ◽  
Extremal Black Holes

The nature of scalar wave functions near the horizon of Reissner–Nordstrom (RN) extremal and Schwarzschild–de Sitter (SdS) extremal black holes are found using WKB approximation and the effect of reflection of waves from the horizon. The absorption cross-section σ abs when RN extremal and SdS extremal black holes placed in a Klein–Gordon field is calculated.

scholarly journals SCATTERING OF SCALAR FIELD BY AN EXTENDED BLACK HOLE IN F(R) GRAVITY

2014 ◽  
Vol 29 (02) ◽  
pp. 1450005 ◽  
Author(s):  
SANEESH SEBASTIAN ◽  
V. C. KURIAKOSE
Keyword(s):  
Black Hole ◽  
Wave Function ◽  
Scalar Field ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Hawking Temperature ◽  
Wkb Method ◽  
Absorption Cross ◽  
Tunneling Method

In this work we have studied the scattering of scalar field around an extended black hole in F(R) gravity using WKB method. We have obtained the wave function in different regions such as near the horizon region, away from horizon and far away from horizon and the absorption cross-section are calculated. We find that the absorption cross-section is inversely proportional to the cube of Hawking temperature. We have also evaluated the Hawking temperature of the black hole via tunneling method.

ABSORPTION CROSS-SECTION OF A SCHWARZSCHILD–DE SITTER BLACK HOLE

2007 ◽  
Vol 16 (01) ◽  
pp. 105-116 ◽  
Author(s):  
R. SINI ◽  
V. C. KURIAKOSE
Keyword(s):  
Black Hole ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Hawking Temperature ◽  
Black Hole Horizon ◽  
Wkb Approximation ◽  
Absorption Cross ◽  
De Sitter ◽  
Klein Gordon ◽  
Sds Black Hole

The Hawking temperature corresponding to the black hole horizon of Schwarzschild–de Sitter (SdS) black hole was found using WKB approximation and the effect of reflection of waves from the quantum horizon. The absorption cross-section σ abs when SdS black hole is placed in a Klein-Gordon field is calculated and is found to be inversely proportional to the Hawking temperature.

scholarly journals Stability analysis and absorption cross section in three-dimensional black string

1998 ◽  
Vol 57 (12) ◽  
pp. 7361-7368 ◽  
Author(s):  
H. W. Lee ◽  
N. J. Kim ◽  
Y. S. Myung ◽  
Jin Young Kim
Keyword(s):  
Stability Analysis ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Three Dimensional ◽  
Absorption Cross ◽  
Black String

scholarly journals Absorption cross section of scalar field in supergravity background

2000 ◽  
Vol 579 (1-2) ◽  
pp. 177-208 ◽  
Author(s):  
R. Manvelyan ◽  
H.J.W. Müller-Kirsten ◽  
J.-Q. Liang ◽  
Yunbo Zhang
Keyword(s):  
Scalar Field ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Absorption Cross

scholarly journals SHEAR VISCOSITY OF YANG–MILLS THEORY IN THE CONFINEMENT PHASE

2007 ◽  
Vol 16 (07) ◽  
pp. 1249-1260
Author(s):  
IVER BREVIK ◽  
KAZUO GHOROKU
Keyword(s):  
Critical Temperature ◽  
Cross Section ◽  
Shear Viscosity ◽  
Absorption Cross Section ◽  
Holographic Model ◽  
Absorption Cross ◽  
Yang Mills ◽  
Glueball Mass ◽  
Mills Field ◽  
Confinement Phase

In terms of a simple holographic model, we study the absorption cross-section and the shear viscosity of a pure Yang–Mills field at low temperature where the system is in the confinement phase. Then we expect that the glueball states are the dominant modes in this phase. In our holographic model, an infrared cut-off rm is introduced as a parameter which fixes the lowest mass of the glueball. As a result, the critical temperature of gluon confinement is estimated to be Tc ~ 127 MeV . For T < Tc, we find that both the absorption cross-section and the shear viscosity are independent of the temperature. Their values are frozen at the values corresponding to the critical point, for 0 < T < Tc. We discuss this behavior by considering the glueball mass and its temperature dependence.

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