Results 61 to 70 of about 205,282 (201)

Challenges and Obstacles for a Bouncing Universe in Brane Models [PDF]

, 2003
A Brane evolving in the background of a charged AdS black-hole displays in general a bouncing behaviour with a smooth transition from a contracting to an expanding phase.
A. Chamblin, A. Hebecker, A. Kehagias, A. Kehagias, A.C. Petkou, A.G. Riess, B. Ratra, C. Barcelo, C. Csaki, C. Csaki, C. Deffayet, C. Deffayet, C. Wetterich, C.P. Burgess, D. Langlois, D.H. Coule, E. Kiritsis, E. Lisi, E. Witten, E.E. Flanagan, G.N. Felder, G.R. Dvali, H. Collins, I. Antoniadis, I. Antoniadis, I. Antoniadis, I. Antoniadis, I. Zlatev, J. Polchinski, J. Rizos, J.M. Cline, J.M. Maldacena, J.P. Gregory, K. Akama, K. Tamvakis, K.A. Olive, L. Randall, L. Randall, L.M. Krauss, M. Bastero-Gil, M. Gasperini, M. Gogberashvili, N. Deruelle, N. Kaloper, N. Kaloper, N. Kaloper, N. Kaloper, N.J. Kim, P. Binetruy, P. Binetruy, P. Brax, P. Horava, P. Kanti, P. Kanti, P. Kanti, P. Kanti, P. Kanti, P. Kanti, P. Kanti, P. Kanti, P. Kraus, P. Kraus, P.G. Ferreira, P.J. Peebles, P.J. Steinhardt, R. Easther, R. Kallosh, R. Maartens, R.B. Mann, R.G. Cai, R.H. Brandenberger, R.H. Brandenberger, R.H. Brandenberger, S. Kachru, S. Kalyana Rama, S. Mukherji, S. Nojiri, S. Perlmutter, S.H. Hansen, S.S. Gubser, T. Nihei, T. Shiromizu, V. Balasubramanian, V.A. Rubakov, V.A. Rubakov, Y. Shtanov, Y.S. Myung   +86 more
core   +3 more sources

Sensitivity Comparison of Searches for Binary Black Hole Coalescences with Ground-based Gravitational-Wave Detectors [PDF]

, 2014
Searches for gravitational-wave transients from binary black hole coalescences typically rely on one of two approaches: matched filtering with templates and morphology-independent excess power searches.
Cadonati, Laura, Caudill, Sarah, Clark, James, Hanna, Chad, Klimenko, Sergey, Mohapatra, Satya, Pankow, Chris, Vaulin, Ruslan, Vedovato, Gabriele, Vitale, Salvatore   +9 more
core   +2 more sources

Partial tidal disruption events by intermediate-mass black holes in supermassive and intermediate-mass black hole binaries

Monthly Notices of the Royal Astronomical Society
ABSTRACT In the centres of galaxies, stars that orbit supermassive black hole binaries (SMBHBs) can undergo tidal disruptions due to the Lidov–Kozai mechanism. Nevertheless, most previous researches have predominantly focused on full tidal disruption events (FTDEs). In this study, we employ N-body simulations to investigate partial tidal
Xiao-Jun Wu, Ye-Fei Yuan, Yan Luo, Wenbin Lin   +3 more
openaire   +2 more sources

The surface density profile of NGC 6388: a good candidate for harboring an intermediate-mass black hole

, 2007
We have used a combination of high resolution (HST ACS-HRC, ACS-WFC, and WFPC2) and wide-field (ESO-WFI) observations of the galactic globular cluster NGC 6388 to derive its center of gravity, projected density profile, and central surface brightness ...
B. Lanzoni, E. Dalessandro, E. Valenti, F. R. Ferraro, Gerssen J., Heggie D. C., Miocchi P., Montegriffo P., P. Miocchi, R. T. Rood, Trenti M.   +10 more
core   +1 more source

Radio observations of NGC 6388: an upper limit on the mass of its central black hole

, 2010
We present the results of deep radio observations with the Australia Telescope Compact Array (ATCA) of the globular cluster NGC 6388. We show that there is no radio source detected (with a r.m.s. noise level of 27 uJy) at the cluster centre of gravity or
A. Tzioumis, B. Lanzoni, Bahcall, Bash, Baumgardt, Bondi, Clark, Clark, Corbel, Corbel, Corbel, D. Cseh, Dalessandro, De Rijcke, E. Körding, Falcke, Falcke, Falcke, Fender, Freire, Fryer, Gallo, Gebhardt, Gebhardt, Grindlay, Gültekin, Gürkan, Jenkins, Kaaret, Kaaret, Kong, Körding, Körding, Lanzoni, M. Coriat, Maccarone, Maccarone, Maccarone, Maccarone, Merloni, Meylan, Miller, Miocchi, Moretti, Nucita, P. Kaaret, Pellegrini, Perna, Pooley, Portegies Zwart, Portegies Zwart, S. Corbel, Sault, Scott, Silk, Skrutskie, Trudolyubov, Ulvestad, Weisskopf, Zampieri   +59 more
core   +1 more source

The need for a second black hole at the Galactic center

, 2003
Deep infra-red observations and long-term monitoring programs have provided dynamical evidence for a supermassive black hole of mass 3.e6 solar masses associated with the radio source Sagitarrius A* at the center of our Galaxy.
Brad M. S. Hansen, Eckart A., Genzel R., Milo Milosavljevi   +3 more
core   +1 more source

Exploring the Evolution of a Dwarf Spheroidal Galaxy with SPH Simulations. II. AGN Feedback

The Astrophysical Journal
We investigate active galactic nucleus (AGN) feedback from an intermediate-mass black hole at the center of a dwarf spheroidal galaxy, by performing isolated galaxy simulations using a modified version of the GADGET-3 code. We consider Leo II (PGC 34176)
Roberto Hazenfratz, Paramita Barai, Gustavo A. Lanfranchi, Anderson Caproni   +3 more
doaj   +1 more source

Intermediate Mass Black Holes in Star Clusters [PDF]

Progress of Theoretical Physics Supplement, 2004
We have performed N-body simulations of the formation of intermediate mass black holes in young star clusters and the subsequent dynamical evolution of star clusters containing massive black holes. Our simulations show that runaway merging of massive main-sequence stars can produce an intermediate mass black hole in the M82 cluster MGG-11 if the ...
Holger Baumgardt, Junichiro Makino
openaire   +1 more source

Toward Black Hole Stars: Supermassive Black Hole Growth in Nuclear Clusters via Stellar-object and Gas Accretion

The Astrophysical Journal Letters
Supermassive black hole (SMBH) growth plausibly occurs via runaway astrophysical black hole mergers in nuclear star clusters that form intermediate mass black hole seeds at high redshifts.
Konstantinos Kritos, Joseph Silk
doaj   +1 more source

Gravitational Wave (GW) Classification, Space GW Detection Sensitivities and AMIGO (Astrodynamical Middle-frequency Interferometric GW Observatory)

EPJ Web of Conferences, 2018
After first reviewing the gravitational wave (GW) spectral classification. we discuss the sensitivities of GW detection in space aimed at low frequency band (100 nHz–100 mHz) and middle frequency band (100 mHz–10 Hz).
Ni Wei-Tou
doaj   +1 more source