Results 41 to 50 of about 186,540 (235)

Tidal forces in dirty black hole spacetimes

European Physical Journal C: Particles and Fields, 2022
Black holes can be inserted in very rich astrophysical environments, such as accretion disks. Although isolated black holes are simple objects in general relativity, their accretion disks may significantly enrich the field configurations of their ...
Haroldo C. D. Lima Junior, Mateus M. Corrêa, Caio F. B. Macedo, Luís C. B. Crispino   +3 more
doaj   +1 more source

Mergers of Supermassive Black Holes in Astrophysical Environments [PDF]

, 2011
Modeling the late inspiral and merger of supermassive black holes is central to understanding accretion processes and the conditions under which electromagnetic emission accompanies gravitational waves.
Armitage, Armitage, Artymowicz, Bode, Bogdanović, Cactus, Cao, Colpi, Deirdre Shoemaker, Einstein Toolkit, Gould, Hayasaki, James Healy, Kocsis, MacFadyen, Mahadevan, Milosavljević, Nemmen, O’Neill, Pablo Laguna, Roland Haas, Schnetter, Shakura, Sharma, Tamara Bogdanović, Tanja Bode, Thornburg, van Meter   +27 more
core   +3 more sources

Analog Schwarzschild black holes of Bose-Einstein condensates in a cavity: Quasinormal modes and quasibound states [PDF]

Physical Review D, 2023
Analog models of black holes have unequivocally proven to be extremely beneficial in providing critical information regarding black hole spectroscopy, superradiance, quantum phenomena and most importantly Hawking radiation and black hole evaporation ...
H. S. Vieira, K. Destounis, K. Kokkotas
semanticscholar   +1 more source

Physics of accretion flows around compact objects [PDF]

, 2006
Several physical and astrophysical problems related to accretion onto black holes and neutron stars are shortly reviewed. I discuss the observed differences between these two types of compact objects in quiescent Soft X-ray Transients.
Abramowicz, Abramowicz, Aharonian, Bahcall, Barceló, Bardeen, Bejger, Berti, Bildsten, Blandford, Blandford, Bondi, Buchdahl, Campana, Casares, Cattoen, Chapline, Chapline, Chapline, Chen, Chen, Davis, Deloye, Dubus, Dubus, Dyson, Fender, Fender, Gallo, Gammie, Goldston, Haensel, Haensel, Hartle, Hopkins, Hughes, Hughes, Ichimaru, Jean-Pierre Lasota, Jonker, Kesden, King, King, Krasnopolsky, Lasota, Lasota, Lasota, Lasota, Li, Mazur, Menou, Menou, Menou, Mirabel, Moderski, Moderski, Narayan, Narayan, Narayan, Narayan, Narayan, Narayan, Natarajan, Nelemans, Oppenheimer, Paczyński, Paczyński, Papaloizou, Rothman, Ruffini, Rutledge, Schunck, Schwarz, Schwarzschild, Schödel, Shafee, Sikora, Torres, Volonteri, Wilson, Yuan, Yungelson   +81 more
core   +3 more sources

Probing the Lorentz Invariance Violation via Gravitational Lensing and Analytical Eigenmodes of Perturbed Slowly Rotating Bumblebee Black Holes [PDF]

Universe, 2023
The ability of bumblebee gravity models to explain dark energy, which is the phenomenon responsible for the universe’s observed accelerated expansion, is one of their most significant applications.
M. Mangut, Huriye Gürsel, Sara Kanzi, I. Sakalli   +3 more
semanticscholar   +1 more source

Most Supermassive Black Holes must be Rapidly Rotating [PDF]

, 2001
We use the integrated spectrum of the X-ray background and quasars Spectral Energy Distribution to derive the contribution of quasars to the energy output of the Universe. We find a lower limit for the energy from accretion onto black holes of 6%, of the
Comastri A., G. Risaliti, G. Zamorani, Guainazzi M., M. Elvis, Mineo T., Miyaji T., Perola G. C., Perola G. C., Setti G., Yuan W.   +10 more
core   +2 more sources

Cosmological coupling of nonsingular black holes [PDF]

Journal of Cosmology and Astroparticle Physics, 2023
We show that — in the framework of general relativity (GR) — if black holes (BHs) are singularity-free objects, they couple to the large-scale cosmological dynamics. We find that the leading contribution to the resulting growth of the BH mass (M BH) as a
M. Cadoni, A. Sanna, M. Pitzalis, B. Banerjee, R. Murgia, N. Hazra, M. Branchesi   +6 more
semanticscholar   +1 more source

Gravitational lensing by a Horndeski black hole

European Physical Journal C: Particles and Fields, 2017
In this article we study gravitational lensing by non-rotating and asymptotically flat black holes in Horndeski theory. By adopting the strong deflection limit, we calculate the deflection angle, from which we obtain the positions and the magnifications ...
Javier Badía, Ernesto F. Eiroa
doaj   +1 more source

Astrophysical signatures of black holes in generalized Proca theories [PDF]

Physical Review D, 2018
Explaining the late time acceleration is one of the most challenging tasks for theoretical physicists today. Infra-red modification of Einstein's general theory of relativity (GR) is a possible route to model late time acceleration.
Mostafizur Rahman, A. A. Sen
semanticscholar   +1 more source

Rotating black holes in Horndeski gravity: thermodynamic and gravitational lensing

European Physical Journal C: Particles and Fields, 2022
The lack of rotating black holes, typically found in nature, hinders testing modified gravity from astrophysical observations. We present the axially symmetric counterpart of an existing spherical hairy black hole in Horndeski gravity having additional ...
Rahul Kumar Walia, Sunil D. Maharaj, Sushant G. Ghosh   +2 more
doaj   +1 more source