scholarly journals Black holes in new massive conformal gravity

2019 ◽  
Vol 100 (6) ◽  
Author(s):  
Yun Soo Myung ◽  
De-Cheng Zou
Keyword(s):  
Black Holes ◽  
Conformal Gravity

scholarly journals Magnetized Particle Motion around Black Holes in Conformal Gravity: Can Magnetic Interaction Mimic Spin of Black Holes?

Universe ◽  
2020 ◽  
Vol 6 (3) ◽  
pp. 44 ◽  
Author(s):  
Kamoliddin Haydarov ◽  
Ahmadjon Abdujabbarov ◽  
Javlon Rayimbaev ◽  
Bobomurat Ahmedov
Keyword(s):  
Magnetic Field ◽  
Black Holes ◽  
Black Hole ◽  
Particle Motion ◽  
Center Of Mass ◽  
Conformal Gravity ◽  
Mass Energy ◽  
Particle Collisions ◽  
Center Of Mass Energy ◽  
Sgr A

Magnetized particle motion around black holes in conformal gravity immersed in asymptotically uniform magnetic field has been studied. We have also analyzed the behavior of magnetic fields near the horizon of the black hole in conformal gravity and shown that with the increase of conformal parameters L and N the value of angular component of magnetic field at the stellar surface decreases. The maximum value of the effective potential corresponding to circular motion of the magnetized particle increases with the increase of conformal parameters. It is shown that in all cases of neutral, charged and magnetized particle collisions in the black hole environment the center-of-mass energy decreases with the increase of conformal parameters L and N. In the case of the magnetized and negatively charged particle collisions, the innermost collision point with the maximum center-of-mass energy comes closer to the central object due to the effects of the parameters of the conformal gravity. We have applied the results to the real astrophysical scenario when a pulsar treated as a magnetized particle is orbiting the super massive black hole (SMBH) Sgr A* in the center of our galaxy in order to obtain the estimation of magnetized compact object’s orbital parameter. The possible detection of pulsar in Sgr A* close environment can provide constraints on black hole parameters. Here we have shown that there is degeneracy between spin of SMBH and ambient magnetic field and consequently the interaction of magnetic field ∼ 10 2 Gauss with magnetic moment of magnetized neutron star can in principle mimic spin of Kerr black holes up to 0.6 .

scholarly journals Singularity-free black holes in conformal gravity: New observational constraints

2019 ◽  
Vol 125 (3) ◽  
pp. 30002 ◽  
Author(s):  
Menglei Zhou ◽  
Askar B. Abdikamalov ◽  
Dimitry Ayzenberg ◽  
Cosimo Bambi ◽  
Leonardo Modesto ◽  
...  
Keyword(s):  
Black Holes ◽  
Observational Constraints ◽  
Conformal Gravity ◽  
Free Black

scholarly journals Black hole thermodynamics and heat engines in conformal gravity

2017 ◽  
Vol 26 (13) ◽  
pp. 1750151 ◽  
Author(s):  
Hao Xu ◽  
Yuan Sun ◽  
Liu Zhao
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Black Hole Thermodynamics ◽  
Spherically Symmetric ◽  
Conformal Gravity ◽  
Extended Phase ◽  
Heat Engines ◽  
Equation Of States ◽  
Symmetric Black Hole ◽  
Black Hole Solutions

The extended phase-space thermodynamics and heat engines for static spherically symmetric black hole solutions of four-dimensional conformal gravity are studied in detail. It is argued that the equation of states (EOS) for such black holes is always branched, any continuous thermodynamical process cannot drive the system from one branch of the EOS into another branch. Meanwhile, the thermodynamical volume is bounded from above, making the black holes always super-entropic in one branch and may also be super-entropic in another branch in certain range of the temperature. The Carnot and Stirling heat engines associated to such black holes are shown to be distinct from each other. For rectangular heat engines, the efficiency always approaches zero when the rectangle becomes extremely narrow, and given the highest and lowest working temperatures fixed, there is always a maximum for the efficiency of such engines.

scholarly journals Testing conformal gravity with astrophysical black holes

2017 ◽  
Vol 95 (6) ◽  
Author(s):  
Cosimo Bambi ◽  
Zheng Cao ◽  
Leonardo Modesto
Keyword(s):  
Black Holes ◽  
Conformal Gravity

scholarly journals Spacetime completeness of non-singular black holes in conformal gravity

2017 ◽  
Vol 2017 (05) ◽  
pp. 003-003 ◽  
Author(s):  
Cosimo Bambi ◽  
Leonardo Modesto ◽  
Lesław Rachwał
Keyword(s):  
Black Holes ◽  
Conformal Gravity

scholarly journals Black holes in six-dimensional conformal gravity

2013 ◽  
Vol 87 (10) ◽  
Author(s):  
H. Lü ◽  
Yi Pang ◽  
C. N. Pope
Keyword(s):  
Black Holes ◽  
Conformal Gravity
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