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.

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 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 On-axis scalar absorption cross section of Kerr–Newman black holes: Geodesic analysis, sinc and low-frequency approximations

2018 ◽  
Vol 27 (11) ◽  
pp. 1843012 ◽  
Author(s):  
Carolina L. Benone ◽  
Luiz C. S. Leite ◽  
Luís C. B. Crispino ◽  
Sam R. Dolan
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Rotation Axis ◽  
Low Frequency ◽  
Massless Scalar ◽  
Massless Scalar Field ◽  
Absorption Cross ◽  
Newman Black Hole

We investigate null geodesics impinging parallel to the rotation axis of a Kerr–Newman black hole, and show that the absorption cross section for a massless scalar field in the eikonal limit can be described in terms of the photon orbit parameters. We compare our sinc and low-frequency approximations with numerical results, showing that they are in excellent agreement.

scholarly journals Absorption by stringy black holes

2021 ◽  
Vol 81 (12) ◽  
Author(s):  
Sérgio V. M. C. B. Xavier ◽  
Carolina L. Benone ◽  
Luís C. B. Crispino
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Massless Scalar ◽  
Absorption Cross ◽  
Charged Black Holes ◽  
Hole Charge ◽  
Newman Black Hole ◽  
The Difference

AbstractWe investigate the absorption of planar massless scalar waves by a charged rotating stringy black hole, namely a Kerr–Sen black hole. We compute numerically the absorption cross section and compare our results with those of the Kerr–Newman black hole, a classical general relativity solution. In order to better compare both charged black holes, we define the ratio of the black hole charge to the extreme charge as Q. We conclude that Kerr–Sen and Kerr–Newman black holes have a similar absorption cross section, with the difference increasing for higher values of Q.

Absorption of zero-mass planar waves by dirty black holes

2018 ◽  
Vol 27 (11) ◽  
pp. 1843017 ◽  
Author(s):  
Caio F. B. Macedo ◽  
Luiz C. S. Leite ◽  
Luís C. B. Crispino
Keyword(s):  
Black Holes ◽  
Cross Section ◽  
Accretion Disks ◽  
Absorption Cross Section ◽  
Scalar Fields ◽  
Massless Scalar ◽  
Absorption Cross ◽  
Thin Spherical Shell ◽  
Nonlinear Nature ◽  
Selection Of

Astrophysical black holes are often with companions, including other gravitating objects, accretion disks, electromagnetic fields, and others. Because of the nonlinear nature of general relativity, it is difficult to account for the gravitational effects of these companions, which can only be investigated analytically for very few cases. In this paper, we consider black holes with surrounding matter — often called dirty black holes — and analyze the absorption cross section of massless scalar fields. We start by laying out the generic setup for spherically symmetric scenarios and then specify for a simple model. We consider planar massless scalar waves impinging upon a Schwarzschild black hole surrounded by a thin spherical shell, and compute the absorption cross section. We present a selection of numerical results complementary to those presented in [C. F. B. Macedo, L. C. S. Leite and L. C. B. Crispino, Phys. Rev. D 93 (2016) 024027, arXiv:1511.08781 [gr-qc]] for arbitrary frequencies, considering different values of the shell position as well as its mass.

Absorption cross section of black holes with global monopole

2013 ◽  
Vol 22 (7) ◽  
pp. 070401 ◽  
Author(s):  
Hai Huang ◽  
Yong-Jiu Wang ◽  
Ju-Hua Chen
Keyword(s):  
Black Holes ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Absorption Cross ◽  
Global Monopole

scholarly journals Scalar waves in regular Bardeen black holes: Scattering, absorption and quasinormal modes

2016 ◽  
Vol 25 (09) ◽  
pp. 1641008 ◽  
Author(s):  
Caio F. B. Macedo ◽  
Luís C. B. Crispino ◽  
Ednilton S. de Oliveira
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Quasinormal Modes ◽  
Scalar Fields ◽  
Scattering Cross Section ◽  
Massless Scalar ◽  
Absorption Cross ◽  
Scattering Cross

We discuss the phenomenology of massless scalar fields around a regular Bardeen black hole, namely absorption cross-section, scattering cross-section and quasinormal modes. We compare the Bardeen and Reissner–Nordström black holes, showing limiting cases for which their properties are similar.

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