Results 31 to 40 of about 71,531 (348)

GIGA-Lens: Fast Bayesian Inference for Strong Gravitational Lens Modeling [PDF]

The Astrophysical Journal, 2022
Abstract We present GIGA-Lens: a gradient-informed, GPU-accelerated Bayesian framework for modeling strong gravitational lensing systems, implemented in TensorFlow and JAX. The three components, optimization using multistart gradient descent, posterior covariance estimation with variational inference, and sampling via Hamiltonian Monte ...
A. Gu, X. Huang, W. Sheu, G. Aldering, A. S. Bolton, K. Boone, A. Dey, A. Filipp, E. Jullo, S. Perlmutter, D. Rubin, E. F. Schlafly, D. J. Schlegel, Y. Shu, S. H. Suyu   +14 more
openaire   +5 more sources

Scattering of Gravitational Waves by the Weak Gravitational Fields of Lens Objects

, 2005
We consider the scattering of the gravitational waves by the weak gravitational fields of lens objects. We obtain the scattered gravitational waveform by treating the gravitational potential of the lens to first order, i.e.
Bartelmann, Bontz, Deguchi, Kaiser, Macquart, Nakamura, Ohanian, Peters, R. Takahashi, Ruffa, S. Michikoshi, T. Suyama, Takahashi, Tatarskii   +13 more
core   +1 more source

CLASS B2108+213: A new wide separation gravitational lens system [PDF]

, 2004
We present observations of CLASS B2108+213, the widest separation gravitational lens system discovered by the Cosmic Lens All-Sky Survey. Radio imaging using the VLA at 8.46 GHz and MERLIN at 5 GHz shows two compact components separated by 4.56 arcsec ...
Biggs, A. D., Blandford, R. D., Browne, I. W. A., de Bruyn, A. G., Fassnacht, C. D., Jackson, N. J., Koopmans, L. V. E., Mao, S., McKean, J. P., Myers, S. T., Norbury, M. A., Pearson, T. J., Phillips, P. M., Readhead, A. C. S., Rusin, D., Treu, T., Wilkinson, P. N., York, T. D.   +17 more
core   +4 more sources

Quantum Uncertainty Considerations for Gravitational Lens Interferometry

, 2008
The measurement of the gravitational lens delay time between light paths has relied, to date, on the source having sufficient variability to allow photometric variations from each path to be compared. However, the delay times of many gravitational lenses
Carico, David P., Doyle, Laurance R.
core   +1 more source

The Effects of Finite Distance on the Gravitational Deflection Angle of Light

Universe, 2019
In order to clarify the effects of the finite distance from a lens object to a light source and a receiver, the gravitational deflection of light has been recently reexamined by using the Gauss−Bonnet (GB) theorem in differential geometry (Ishihara
Toshiaki Ono, Hideki Asada
doaj   +1 more source

The Effects of Massive Substructures on Image Multiplicities in Gravitati onal Lenses

, 2003
Surveys for gravitational lens systems have typically found a significantly larger fraction of lenses with four (or more) images than are predicted by standard ellipsoidal lens models (50% versus 25-30%).
C. S. Kochanek, J. D. Cohn, Jaffe W., King L. J., Kochanek C. S., Patnaik A. R., Seitz S.   +6 more
core   +3 more sources

Defocusing gravitational microlensing [PDF]

, 1996
We introduce the notion of defocusing gravitational lens considering a MACHO located behind a light source with respect to an observer. The consequence of defocusing effect is a temporal variability of star luminosity which produces a gap instead of a ...
A A Marino, Alard C, Binney J, Blioh P V, Byrd P F, Carr B J, G Marmo, Harwit M, Hawking S W, Kaiser R, Paczynski B, Padmanabhan T, Papapetrou A, Peebles P J E, R de Ritis, Refsdal S, S Capozziello, Schneider P, Schneider P, Schneider P, Udalski A, V I Man'ko, Wald R M   +22 more
core   +3 more sources

Using gravitational lenses to detect gravitational waves [PDF]

, 1990
Gravitational lenses could be used to detect gravitational waves, because a gravitational wave affects the travel-time of a light ray. In a gravitational lens, this effect produces time-delays between the different images.
Allen, B.
core   +2 more sources

Gravitational lens interference

The Astrophysical Journal, 1991
The consequence of the existence, when a lens is present, of two propagation paths from a source to the observer is investigated. Attention is focused on quasars as background sources; however, the results received are general and apply to pulsars and stellar sources as well. 12 refs.
J. B. Peterson, Toby Falk
openaire   +1 more source

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