Results 21 to 30 of about 56,013 (217)

Constraints on the Size of Extra Dimensions from the Orbital Evolution of the Black-Hole X-Ray Binary XTE J1118+480 [PDF]

, 2009
In a universe of the Randall-Sundrum type, black holes are unstable and emit gravitational modes in the extra dimension. This leads to dramatically shortened lifetimes of astrophysical black holes and to an observable change of the orbital period of ...
Johannsen, Tim
core   +2 more sources

Hair of Astrophysical Black Holes [PDF]

, 2014
The "no hair" theorem is not applicable to black holes formed from collapse of a rotating neutron star. Rotating neutron stars can self-produce particles via vacuum breakdown forming a highly conducting plasma magnetosphere such that magnetic field lines are effectively "frozen-in" the star both before and during collapse.
openaire   +2 more sources

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

Astrophysical constraints on primordial black holes in Brans-Dicke theory

, 2010
We consider cosmological evolution in Brans-Dicke theory with a population of primordial black holes. Hawking radiation from the primordial black holes impacts various astrophysical processes during the evolution of the Universe.
A.S Majumdar, A.W. Strong, B Nayak, B. Nayak, B.J. Carr, B.V. Vainer, B.V. Vainer, C. Mathiazhagan, D. Lindley, D.J. Fixsen ., E.W. Kolb, I. Hawke, I. Musco, I.D. Novikov, J. Yokoyama, L.P Singh, P.D. Nasel'skii, R.A. Sunyaev, S.G. Rubin, S.W. Hawking, Ya.B. Zel'dovich, Ya.B. Zel'dovich, Ya.B. Zel'dovich, Ya.B. Zel'dovich   +23 more
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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
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The Formation and Evolution of the First Massive Black Holes

, 2004
The first massive astrophysical black holes likely formed at high redshifts (z>10) at the centers of low mass (~10^6 Msun) dark matter concentrations.
A Cattaneo, A Cavaliere, A Gould, A Heger, A Jenkins, A Kashlinsky, A Kogut, A Lidz, A Soltan, A Songaila, A Venkatesan, A Wandel, AA Thoul, AC Fabian, AJ Barger, AR King, AR King, AW Graham, B Ciardi, B Ciardi, BJ Carr, CF Gammie, CF Gammie, CJ Willott, CL Bennett, CS Kochanek, D Eisenstein, D Galli, D Lynden-Bell, D Lynden-Bell, D Merritt, D Proga, DC Heggie, DE Berk Van den, DM Alexander, DM Alexander, DN Spergel, DQ Lamb, DR Garnett, E Quataert, EE Salpeter, EJM Colbert, ET Vishniac, F Haardt, F Hoyle, F Palla, F Walter, FA Rasio, G Efstathiou, G Efstathiou, G Kauffmann, G Quinlan, GA Shields, GJ Wasserburg, GL Granato, GM Fuller, GP Holder, GT Richards, H Baumgardt, H Kang, H Kang, H Netzer, H Susa, H Zhao, HM Lee, I Igumenshchev, I Shlosman, J Arons, J Binney, J Comerford, J Goodman, J Magorrian, J Miralda-Escudé, J Silk, J Silk, J Stone, J Tumlinson, J-H Woo, JA Sellwood, JA Tyson, JE Gunn, JF Navarro, JM Shull, JM Stone, JP Ostriker, K Gebhardt, K Gebhardt, K Menou, K Menou, L Ciotti, L Ciotti, L Ferrarese, L Ferrarese, L Ferrarese, L Hui, LL Spitzer Jr, M Dijkstra, M Elvis, M Fukugita, M Kaplinghat, M Milosavljevic, M Saijo, M Shibata, M Tegmark, M Vestergaard, M Vestergaard, M Volonteri, M Zaldarriaga, MC Begelman, MC Begelman, MC Begelman, MC Begelman, MC Begelman, MC Begelman, MG Haehnelt, MG Haehnelt, MG Haehnelt, MG Haehnelt, MJ Kukula, MJ Rees, MJ Rees, NI Shakura, NY Gnedin, NY Gnedin, NY Gnedin, O Blaes, P Hut, P Kaaret, P Madau, P Madau, P Madau, P Madau, P Martini, P Martini, P McDonald, P Monaco, P Salucci, P Valageas, P Väisänen, PA Shaver, PJ Armitage, PR Shapiro, PR Shapiro, Q Yu, Q Yu, R Barkana, R Barkana, R Cen, R Cen, RD Blandford, RD Blandford, RF Mushotzky, RH Becker, RK Islam, RK Sheth, RL White, RP Marel Van der, RP Marel Van der, RP Marel Van der, RV Wagoner, S Croom, S Kaspi, S Lepp, S Wyithe, S Wyithe, S Wyithe, S Wyithe, SA Hughes, SDM White, SE Woosley, SF Portegies Zwart, SL Shapiro, SL Shapiro, SP Oh, SP Oh, SP Oh, SP Oh, SR Heap, T Abel, T Abel, T Abel, T Abel, T Hirasawa, T Kitayama, T Matsuda, T Matteo Di, T Miyaji, T Theuns, TA Small, V Bromm, V Bromm, V Bromm, WC Saslaw, WH Press, X Fan, X Fan, X Fan, X Fan, X Wu, YB Zel’dovich, Z Haiman, Z Haiman, Z Haiman, Z Haiman, Z Haiman, Z Haiman, Z Haiman, Z Haiman, Z Haiman, Z Haiman, Z Haiman, Z Haiman, Z Haiman, Z Haiman, Z Haiman   +214 more
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Black holes in astrophysics

New Journal of Physics, 2005
To appear in a forthcoming Special Focus Issue on "Spacetime 100 Years Later" published by the New Journal of Physics (http://www.iop.org/EJ/njp) The article, finalized in October, 2004, consists of 21 pages of text, 3 figures and 6 movies (found at http://www.cfa.harvard.edu/~narayan/NJP)
openaire   +3 more sources

Electric Currents along Astrophysical Jets

Galaxies, 2017
Astrophysical black holes and their surrounding accretion disks are believed to be threaded by grand design helical magnetic fields. There is strong theoretical evidence that the main driver of their winds and jets is the Lorentz force generated by these
Ioannis Contopoulos
doaj   +1 more source

Improved methods for simulating nearly extremal binary black holes [PDF]

, 2014
Astrophysical black holes could be nearly extremal (that is, rotating nearly as fast as possible); therefore, nearly extremal black holes could be among the binaries that current and future gravitational-wave observatories will detect.
Boyle, Michael, Giesler, Matthew, Hemberger, Daniel A., Kidder, Lawrence E., Kuper, Kevin, Lovelace, Geoffrey, Scheel, Mark A., Szilagyi, Bela   +7 more
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Black Holes: from Speculations to Observations [PDF]

, 2006
This paper provides a brief review of the history of our understanding and knowledge of black holes. Starting with early speculations on ``dark stars'' I discuss the Schwarzschild "black hole" solution to Einstein's field equations and the development of
Baumgarte, Thomas W.
core   +2 more sources