Absorption Cross Section and Decay Rate of Stationary Axisymmetric Einstein–Maxwell Dilaton Axion Black Hole

2010 ◽  
Vol 27 (4) ◽  
pp. 040401 ◽  
Author(s):  
Liu Chang-Qing
Keyword(s):  
Black Hole ◽  
Decay Rate ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Absorption Cross

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 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.

scholarly journals Connection between Sinc Approximation for High-Energy Absorption Cross Section and Shadow of Black Holes

2021 ◽  
Author(s):  
Ali Övgün
Keyword(s):  
Black Hole ◽  
Energy Absorption ◽  
Cross Section ◽  
Absorption Cross Section ◽  
High Energy ◽  
Absorption Cross ◽  
Sinc Approximation ◽  
Black Hole Spacetime ◽  
Symmetric Black Hole ◽  
High Energy Absorption

This letter aims to show the connection between the sinc approximation for high-energy absorption cross section and the shadow radius of the spherically symmetric black hole. This connection can give a physical interpretation of the absorption cross section in the eikonal limit parameters. Moreover, the use of this alternative way, one can extract its shadow radius from the absorption cross section in high energy limits to gain more information about the black hole spacetime. Our results indicate that the increasing the value of the shadow radius of the black hole, exponentially increase the the absorption cross section of the black hole in high-energy limits which can be captured by the Event Horizon Telescope (EHT) collaboration.

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