scholarly journals Low-Energy Absorption Cross Section for massive scalar and Dirac fermion by (4 n)-dimensional Schwarzschild Black Hole

2004 ◽  
Vol 2004 (09) ◽  
pp. 005-005 ◽  
Author(s):  
Eylee Jung ◽  
SungHoon Kim ◽  
D. K Park
Keyword(s):  
Black Hole ◽  
Energy Absorption ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Low Energy ◽  
Dirac Fermion ◽  
Massive Scalar ◽  
Absorption Cross ◽  
Schwarzschild 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.

scholarly journals Fermion absorption cross section of a Schwarzschild black hole

2005 ◽  
Vol 71 (12) ◽  
Author(s):  
Chris Doran ◽  
Anthony Lasenby ◽  
Sam Dolan ◽  
Ian Hinder
Keyword(s):  
Black Hole ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Absorption Cross ◽  
Schwarzschild 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 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 for S-wave massive scalar

2004 ◽  
Vol 586 (3-4) ◽  
pp. 390-396 ◽  
Author(s):  
Eylee Jung ◽  
Sung Hoon Kim ◽  
D.K. Park
Keyword(s):  
Cross Section ◽  
Absorption Cross Section ◽  
Massive Scalar ◽  
Absorption Cross ◽  
S Wave
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