scholarly journals Location of the last stable orbit in Kerr spacetime

2020 ◽  
Vol 101 (6) ◽  
Author(s):  
Leo C. Stein ◽  
Niels Warburton
Keyword(s):  
Stable Orbit ◽  
Kerr Spacetime

Iron Fluorescence from within the Innermost Stable Orbit of Black Hole Accretion Disks

1997 ◽  
Vol 488 (1) ◽  
pp. 109-118 ◽  
Author(s):  
Christopher S. Reynolds ◽  
Mitchell C. Begelman
Keyword(s):  
Black Hole ◽  
Accretion Disks ◽  
Stable Orbit ◽  
Black Hole Accretion ◽  
Hole Accretion

scholarly journals Kerr-spacetime geometric optics for vortex beams

2021 ◽  
Vol 104 (1) ◽  
Author(s):  
Fabrizio Tamburini ◽  
Fabiano Feleppa ◽  
Ignazio Licata ◽  
Bo Thidé
Keyword(s):  
Geometric Optics ◽  
Kerr Spacetime ◽  
Vortex Beams

The habitable zone of Earth-mass planets around 47 UMa: results for land and water worlds

2003 ◽  
Vol 2 (1) ◽  
pp. 35-39 ◽  
Author(s):  
S. Franck ◽  
M. Cuntz ◽  
W. von Bloh ◽  
C. Bounama
Keyword(s):  
Surface Water ◽  
System Approach ◽  
Distinct Type ◽  
Integrated System ◽  
Habitable Zone ◽  
Stable Orbit ◽  
The Earth ◽  
Earth Like Planets ◽  
Very High

In a previous paper, we showed that Earth-type habitable planets around 47 UMa are in principle possible if a distinct set of conditions is warranted. These conditions include that the Earth-type planets have successfully formed and are orbitally stable and, in addition, that the 47 UMa star–planet system is relatively young ([lsim ]6 Gyr). We now extend this study by considering Earth-like planets with different land/ocean coverages. This study is again based on the so-called integrated system approach, which describes the photosynthetic biomass production taking into account a variety of climatological, biogeochemical and geodynamical processes. This approach implies a special characterization of the habitable zone defined for a distinct type of planet. We show that the likelihood of finding a habitable Earth-like planet on a stable orbit around 47 UMa critically depends on the percentage of the planetary land/ocean coverage. The likelihood is significantly increased for planets with a very high percentage of ocean surface (‘water worlds’).

scholarly journals Shadows and negative precession in non-Kerr spacetime

2021 ◽  
Vol 103 (8) ◽  
Author(s):  
Parth Bambhaniya ◽  
Dipanjan Dey ◽  
Ashok B. Joshi ◽  
Pankaj S. Joshi ◽  
Divyesh N. Solanki ◽  
...  
Keyword(s):  
Kerr Spacetime

scholarly journals Gravitational self-force corrections to gyroscope precession along circular orbits in the Kerr spacetime

2018 ◽  
Vol 98 (10) ◽  
Author(s):  
Donato Bini ◽  
Thibault Damour ◽  
Andrea Geralico ◽  
Chris Kavanagh ◽  
Maarten van de Meent
Keyword(s):  
Circular Orbits ◽  
Kerr Spacetime ◽  
Self Force ◽  
Gyroscope Precession

scholarly journals PARTICLE DYNAMICS IN WEAKLY CHARGED EXTREME KERR THROAT

2011 ◽  
Vol 20 (05) ◽  
pp. 649-660 ◽  
Author(s):  
A. M. AL ZAHRANI ◽  
VALERI P. FROLOV ◽  
ANDREY A. SHOOM
Keyword(s):  
Charged Particle ◽  
Particle Motion ◽  
Particle Dynamics ◽  
Killing Tensor ◽  
Dynamical Equations ◽  
Kerr Spacetime

We study dynamics of a test charged particle moving in a weakly charged extreme Kerr throat. Dynamical equations of the particle motion are solved in quadratures. We show explicitly that the Killing tensor of the Kerr spacetime becomes reducible in the extreme Kerr throat geometry. Special types of motion of particles and light are discussed.

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