SCATTERING OF SCALAR WAVE FROM BLACK HOLE IN HOŘAVA–LIFSHITZ GRAVITY

2012 ◽  
Vol 21 (05) ◽  
pp. 1250045 ◽  
Author(s):  
HAO LIAO ◽  
JUHUA CHEN ◽  
YONGJIU WANG
Keyword(s):  
Black Hole ◽  
Cross Section ◽  
Absorption Cross Section ◽  
High Frequency ◽  
Coupling Parameter ◽  
Absorption Cross ◽  
Scalar Wave ◽  
Fixed Frequency ◽  
Oscillation Pattern ◽  
Frequency Regime

Using the partial wave method, we analyze the Schröedinger-type scalar wave equation from black hole in Hořava–Lifshitz gravity and numerically investigate its absorption cross section and scattering cross section. We find that the absorption cross section oscillates around the geometric optical value in the high frequency regime, and the scattering angle width becomes narrower and the damping oscillation pattern becomes more complex as the angular momentum l increases. With fixed frequency of scalar wave ω, the glory peak becomes lower and the glory width becomes wider as the coupling parameter α increases.

scholarly journals Absorption and Scattering Cross Section of Regular Black Holes

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Hai Huang ◽  
Ping Liao ◽  
Juhua Chen ◽  
Yongjiu Wang
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Cross Section ◽  
Absorption Cross Section ◽  
High Frequency ◽  
Massless Scalar ◽  
Absorption Cross ◽  
High Frequency Region ◽  
Regular Black Hole ◽  
Regular Black Holes

By using the partial wave method, we investigate the absorption of massless scalar wave from regular black hole. We numerically carry out the absorption cross section and find that the larger angular momentum quantum number l is, the smaller the corresponding maximum value of partial absorption cross section is. Comparing with Schwarzschild case, the absorption cross section of regular black holes is strengthened in both low and high frequency regions, and the absorption cross section oscillates around the geometric optical value in the high frequency region. Generally speaking, the scattering flux is strengthened and its scattering width becomes narrower in the forward direction. There are obvious contrast of scattering properties of different type of regular black hole.

Absorption of massless scalar field by rotating black holes

2016 ◽  
Vol 25 (09) ◽  
pp. 1641024 ◽  
Author(s):  
Luiz C. S. Leite ◽  
Luís C. B. Crispino ◽  
Ednilton S. de Oliveira ◽  
Caio F. B. Macedo ◽  
Sam R. Dolan
Keyword(s):  
Black Holes ◽  
Scalar Field ◽  
Cross Section ◽  
Absorption Cross Section ◽  
High Frequency ◽  
Massless Scalar ◽  
Massless Scalar Field ◽  
Absorption Cross ◽  
Frequency Regime ◽  
Selection Of

We compute the absorption cross-section of the Kerr black holes (BH) for the massless scalar field, and present a selection of numerical results, to complement the results of Ref.[C. F. B. Macedo, L. C. S. Leite, E. S. Oliveria, S. R. Dolan and L. C. B. Crispino, Phys. Rev. D 88 (2013) 064033.] We show that, in the high-frequency regime, the cross-section approaches the geodesic capture cross-section. We split the absorption cross-section into corotating and counterrotating contributions, and we show that the counterrotating contribution exceeds the corotating one.

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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