Results 201 to 210 of about 4,909 (237)
Testing conformal gravity with astrophysical black holes
Physical Review D, 2017 Weyl conformal symmetry can solve the problem the spacetime singularities present in Einstein's gravity. In a recent paper, two of us have found a singularity-free rotating black hole solution in conformal gravity.
Cosimo Bambi +2 more
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Spinning Black Holes in Astrophysical Environments [PDF]
Physical Review Letters5 pages, 2 figures + supplemental material; V2: Accepted for publication in Physical Review ...
Pedro G S Fernandes, Vitor Cardoso
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No-Hair Theorem for Black Holes in Astrophysical Environments [PDF]
Physical Review Letters, 2015 According to the no-hair theorem, static black holes are described by a Schwarzschild spacetime provided there are no other sources of the gravitational field. This requirement, however, is in astrophysical realistic scenarios often violated, e.g., if the black hole is part of a binary system or if it is surrounded by an accretion disk. In these cases,
Norman Gürlebeck
exaly +4 more sources
Microscopic Origin of the Entropy of Astrophysical Black Holes
Physical Review LettersWe construct an infinite family of microstates for black holes in Minkowski spacetime which have effective semiclassical descriptions in terms of collapsing dust shells in the black hole interior. Quantum mechanical wormholes cause these states to have exponentially small, but universal, overlaps.
Vijay Balasubramanian +2 more
exaly +5 more sources
Journal of Cosmology and Astroparticle Physics, 2021 We perform a hierarchical Bayesian analysis of the GWTC-2 catalog to investigate the mixed scenario in which the merger events are explained by black holes of both astrophysical and primordial origin.
Valerio De Luca +2 more
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Astrophysical Black Holes: A Compact Pedagogical Review [PDF]
Annalen Der Physik, 2018 AbstractBlack holes are among the most extreme objects that can be found in the Universe and an ideal laboratory for testing fundamental physics. Here, the basic properties of black holes as expected from general relativity, the main astronomical observations, and the leading astrophysical techniques to probe the strong gravity region of these objects ...
Cosimo Bambi
exaly +3 more sources
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AIP Conference Proceedings, 2010
Black holes are the simplest objects in nature. All the matter enter into it with the speed of light at the horizon and thus the inner boundary condition is fixed, independent of whether we study stellar mass black holes (nano‐quasars) or the massive (miliquasars) and super‐massive black holes (Quasars). All types of flows are thus transonic.
Sandip K. Chakrabarti +2 more
openaire +1 more source
Black holes are the simplest objects in nature. All the matter enter into it with the speed of light at the horizon and thus the inner boundary condition is fixed, independent of whether we study stellar mass black holes (nano‐quasars) or the massive (miliquasars) and super‐massive black holes (Quasars). All types of flows are thus transonic.
Sandip K. Chakrabarti +2 more
openaire +1 more source
2001
In this paper we will give a brief review of some problems of astrophysics of black holes. For systematic discussion of the problem see: [1, 2, 3, 4].
I. V. Artemova, I. D. Novikov
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In this paper we will give a brief review of some problems of astrophysics of black holes. For systematic discussion of the problem see: [1, 2, 3, 4].
I. V. Artemova, I. D. Novikov
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1998
The black hole phenomenon is undoubtedly one of the most striking and intriguing of those predicted by theorists. However, a paramount question is: “Do black holes exist in the Universe, or are they only an abstract concept of the human mind?” In principle, a black hole could be built artificially.
Valeri P. Frolov, Igor D. Novikov
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The black hole phenomenon is undoubtedly one of the most striking and intriguing of those predicted by theorists. However, a paramount question is: “Do black holes exist in the Universe, or are they only an abstract concept of the human mind?” In principle, a black hole could be built artificially.
Valeri P. Frolov, Igor D. Novikov
openaire +1 more source
2017
The chapter reviews the astrophysical observations of stellar-mass black holes, intermediate mass black holes, supermassive black holes, the observations supporting the idea that these objects are indeed black holes, and the spectral state classification.
openaire +1 more source
The chapter reviews the astrophysical observations of stellar-mass black holes, intermediate mass black holes, supermassive black holes, the observations supporting the idea that these objects are indeed black holes, and the spectral state classification.
openaire +1 more source