Results 21 to 30 of about 33,319 (274)

Strong Gravitational Lensing with SKA

, 2004
The advent of new observational facilities in the last two decades has allowed the rapid discovery and high-resolution optical imaging of many strong lens systems from galaxy to cluster scales, as well as their spectroscopic follow-up.
Browne, I.W.A. Browne, L.V.E. Koopmans, Myers, N.J. Jackson, Schneider   +5 more
core   +2 more sources

Strong gravitational lensing by wormholes

, 2019
We study strong gravitational lensing by a class of static wormhole geometries. Analytical approaches to the same are developed, and the results differ substantially from strong lensing by black holes, first reported by Bozza.
Banerjee, Pritam, Paul, Suvankar, Sarkar, Tapobrata, Shaikh, Rajibul   +3 more
core   +1 more source

Strong field gravitational lensing in scalar tensor theories

, 2006
Strong field gravitational lensing in the Brans-Dicke theory has been studied. The deflection angle for photons passing very close to the photon sphere is estimated for the static spherically symmetric space-time of the theory and the position and ...
Arunava Bhadra, Bardas B, Bhadra A, Bhadra A Sarkar K Datta D P Nandi K K, Damour T, Danzmann K, Darwin C, Eiroa E F, Joshi P S, Kabita Sarkar, Larranaga Rubio E A, Luminet J P, Murphy T W, Richstone D, Turyshev S G, Turyshev S G Shao M Nordtvedt K L, Turyshev S G Shao M Nordtvedt K L, Will C M   +17 more
core   +2 more sources

A New Survey for Giant Arcs [PDF]

, 2006
We report on the first results of an imaging survey to detect strong gravitational lensing targeting the richest clusters selected from the photometric data of the Sloan Digital Sky Survey (SDSS) with follow-up deep imaging observations from the ...
Adelman-McCarthy J. K., Bartelmann M., Benjamin Koester, Crawford C. S., Dalal N., Dalal N. & Keeton C. R., Donald P. Schneider, Gladders M. D., Gladders M. D., Huan Lin, Hubert Lampeitl, Issha Kayo, James Annis, Joseph F. Hennawi, Lupton R. H., Masamune Oguri, Michael A. Strauss, Michael D. Gladders, Naohisa Inada, Natarajan P., Natarajan P., Neal Dalal, Neta A. Bahcall, Priyamvada Natarajan, Smail I., Smail I., Spergel D. N.   +26 more
core   +3 more sources

The Longest Delay: A 14.5 yr Campaign to Determine the Third Time Delay in the Lensing Cluster SDSS J1004+4112

The Astrophysical Journal, 2022
We present new light curves for the four bright images of the five image cluster-lensed quasar gravitational lens system SDSS J1004+4112. The light curves span 14.5 yr and allow the measurement of the time delay between the trailing bright quasar image D
J. A. Muñoz, C. S. Kochanek, J. Fohlmeister, J. Wambsganss, E. Falco, R. Forés-Toribio   +5 more
doaj   +1 more source

Strong Gravitational Lensing by Sgr A*

, 2010
In recent years, there has been increasing recognition of the potential of the galactic center as a probe of general relativity in the strong field. There is almost certainly a black hole at Sgr A* in the galactic center, and this would allow us the ...
Amitai Y Bin-Nun, Bin-Nun A Y, Bozza V, Bozza V, Bozza V, Eiroa E F Sendra C M, Ghez A M, Gillessen S, Holz D E, Misner C W, Schneider P, Wambsganss J, Whisker R   +12 more
core   +1 more source

Relationship between High-Energy Absorption Cross Section and Strong Gravitational Lensing for Black Hole

, 2011
In this paper, we obtain a relation between the high-energy absorption cross section and the strong gravitational lensing for a static and spherically symmetric black hole. It provides us a possible way to measure the high-energy absorption cross section
A. A. Starobinsky, C. W. Misner, Heng Guo, K. S. Virbhadra, Shao-Wen Wei, Yu-Xiao Liu   +5 more
core   +1 more source

Strong gravitational lensing in a squashed Kaluza-Klein black hole spacetime

, 2010
We investigate the strong gravitational lensing in a Kaluza-Klein black hole with squashed horizons. We find the size of the extra dimension imprints in the radius of the photon sphere, the deflection angle, the angular position and magnification of the ...
E. Jung, Jiliang Jing, K. S. Virbhadra, Songbai Chen, Yue Liu   +4 more
core   +1 more source

Strong field limit of black hole gravitational lensing [PDF]

, 2001
We give the formulation of the gravitational lensing theory in the strong field limit for a Schwarzschild black hole as a counterpart to the weak field approach.
C. M. Will, D. Richstone, G. Iovane, G. Scarpetta, H. Falcke, J. M. Bardeen, K. S. Virbhadra, P. Schneider, S. Capozziello, S. Frittelli, S. U. Viergutz, S. Weinberg, V. Bozza   +12 more
core   +2 more sources

Liquid Metals as Initiators of Free‐Radical Polymerization of Hydrogels: A Perspective

Advanced Functional Materials, EarlyView.
Gallium‐based liquid metals initiate free radical polymerization to form hydrogels without the use of toxic molecular initiators. In addition to initiating polymerization, they can act as crosslinkers, yielding softer, more extensible, and tougher hydrogels than those formed with conventional initiators.
Syed Ahmed Jaseem, Pooria Rahmani, Tushar Sakorikar, Jinwoo Ma, Omar Almutairi, Maxim A. Voinov, Alex I. Smirnov, Baihang Chen, Michael D. Dickey   +8 more
wiley   +1 more source