Theories of Non-Thermal Radiations from Planets

2013 ◽  
pp. 239-249 ◽  
Author(s):  
L. C. Lee
Keyword(s):  
Thermal Radiations

scholarly journals Optical properties of Kerr–Newman spacetime in the presence of plasma

2020 ◽  
Vol 80 (8) ◽  
Author(s):  
Gulmina Zaman Babar ◽  
Abdullah Zaman Babar ◽  
Farruh Atamurotov
Keyword(s):  
Black Hole ◽  
Kerr Black Hole ◽  
Field Approximation ◽  
Weak Field ◽  
Jacobi Method ◽  
Plasma Parameters ◽  
Spin Parameter ◽  
Newman Black Hole ◽  
Shadow Cast ◽  
Thermal Radiations

Abstract We have studied the null geodesics in the background of the Kerr–Newman black hole veiled by a plasma medium using the Hamilton–Jacobi method. The influence of black hole’s charge and plasma parameters on the effective potential and the generic photon orbits has been investigated. Furthermore, our discussion embodies the effects of black hole’s charge, plasma and the inclination angle on the shadow cast by the gravity with and without the spin parameter. We examined the energy released from the black hole as a result of the thermal radiations, which exclusively depends on the size of the shadow. The angle of deflection of the massless particles is also explored considering a weak-field approximation. We present our results in juxtaposition to the analogous black holes in General Relativity, particularly the Schwarzschild and Kerr black hole.

scholarly journals Hawking Non-thermal and Purely Thermal Radiations of Rotating Black Hole in Anti-de Sitter Space Time by Hamilton-Jacobi Method

2018 ◽  
Vol 37 ◽  
pp. 99-109
Author(s):  
M Ilias Hossain
Keyword(s):  
Black Hole ◽  
Angular Momentum ◽  
Emission Spectrum ◽  
Hawking Radiation ◽  
De Sitter Space ◽  
Space Time ◽  
Jacobi Method ◽  
De Sitter ◽  
Tunneling Method ◽  
Thermal Radiations

We have explored Hawking non-thermal and purely thermal radiations of Kerr-anti-de Sitter (KAdS) black hole using massive particles tunneling method by taking into account the space time background as dynamical, energy and angular momentum as conserved incorporating the selfgravitation effect of the emitted particles. The results we have obtained for KAdS black hole have shown that the tunneling rates are related to the change of Bekenstein-Hawking entropy and the derived emission spectrum deviates from the pure thermal spectrum and also the obtaining results for KAdS black hole are accordant with Parikh and Wilczek’s opinion and gives a correction to the Hawking radiation of KAdS black hole.GANIT J. Bangladesh Math. Soc.Vol. 37 (2017) 99-109

scholarly journals Thermal Transport in Radiative Nanofluids by Considering the Influence of Convective Heat Condition

2022 ◽  
Vol 2022 ◽  
pp. 1-11
Author(s):  
Adnan ◽  
Waqas Ashraf ◽  
Abdulaziz H. Alghtani ◽  
Ilyas Khan ◽  
M. Andualem
Keyword(s):  
Heat Transfer ◽  
Nusselt Number ◽  
Bounded Domain ◽  
Local Nusselt Number ◽  
Numerical Scheme ◽  
Shear Stresses ◽  
The Novel ◽  
Heat Condition ◽  
Surface Convection ◽  
Thermal Radiations

The analysis of nanofluid dynamics in a bounded domain attained much attention of the researchers, engineers, and industrialists. These fluids became much popular in the researcher’s community due to their broad uses regarding the heat transfer in various industries and fluid flowing in engine and in aerodynamics as well. Therefore, the analysis of Cu-kerosene oil and Cu-water is organized between two Riga plates with the novel effects of thermal radiations and surface convection. The problem reduced in the form of dimensionless system and then solved by employing variational iteration and variation of parameter methods. For the sake of validity, the results checked with numerical scheme and found to be excellent. Further, it is examined that the nanofluids move slowly by strengthen Cu fraction factor. The temperature of Cu-kerosene oil and Cu-water significantly rises due to inducing thermal radiations and surface convection. The behaviour of shear stresses is in reverse proportion with the primitive parameters, and local Nusselt number increases due to varying thermal radiations, Biot number, and fraction factor, respectively.

scholarly journals Systematic analysis about the polarization in thermal radiations of magnetars

2017 ◽  
Vol 13 (S337) ◽  
pp. 430-431
Author(s):  
Akihiro Yatabe ◽  
Shoichi Yamada
Keyword(s):  
Magnetic Field ◽  
Generation X ◽  
Next Generation ◽  
Systematic Analysis ◽  
X Ray ◽  
Thermal Radiations ◽  
The Magnetic Field

AbstractWe calculated the polarization in soft X-ray emitted from magnetars, which are expected to be observed by the next-generation X-ray satellites. We consider possible conversions of photon’s polarization modes in the atmosphere and it cannot be ignored when the magnetic field is relatively weak B ≲ 1013G.

scholarly journals Non-classicality of photon added coherent and thermal radiations

2006 ◽  
Vol 40 (1) ◽  
pp. 133-138 ◽  
Author(s):  
A. R. Usha Devi ◽  
R. Prabhu ◽  
M. S. Uma
Keyword(s):  
Thermal Radiations

scholarly journals A Novel Investigation and Hidden Effects of MHD and Thermal Radiations in Viscous Dissipative Nanofluid Flow Models

2020 ◽  
Vol 8 ◽  
Author(s):  
Naveed Ahmed ◽  
Adnan ◽  
Umar Khan ◽  
Syed Tauseef Mohyud-Din ◽  
Ilyas Khan ◽  
...  
Keyword(s):  
Nanofluid Flow ◽  
Flow Models ◽  
Thermal Radiations

scholarly journals Effect of Thermal Radiations on Performance of Solar Cells

2013 ◽  
Vol 43 ◽  
pp. 012008
Author(s):  
Jacob George ◽  
Jiju Sasikumar ◽  
R Jayakrishnan
Keyword(s):  
Solar Cells ◽  
Thermal Radiations
Sign in / Sign up

Export Citation Format

Share Document