Results 61 to 70 of about 95,116 (297)

Hierarchical Inference with Bayesian Neural Networks: An Application to Strong Gravitational Lensing [PDF]

arXiv.org, 2020
In the past few years, approximate Bayesian Neural Networks (BNNs) have demonstrated the ability to produce statistically consistent posteriors on a wide range of inference problems at unprecedented speed and scale.
S. Wagner-Carena, Ji Won Park, S. Birrer, P. Marshall, A. Roodman, Risa Wechsler   +5 more
semanticscholar   +1 more source

Measurements of the Hubble constant and cosmic curvature with quasars: ultracompact radio structure and strong gravitational lensing [PDF]

Monthly notices of the Royal Astronomical Society, 2020
Although the Hubble constant H0 and spatial curvature ΩK have been measured with very high precision, they still suffer from some tensions. In this paper, we propose an improved method to combine the observations of ultracompact structure in radio ...
Jingzhao Qi, Jia-Wei Zhao, Shuo Cao, M. Biesiada, Yuting Liu   +4 more
semanticscholar   +1 more source

Strong gravitational lensing with Gauss-Bonnet correction [PDF]

Journal of Cosmology and Astroparticle Physics, 2014
In this paper we investigate the strong gravitational lensing with Gauss-Bonnet gravity. By considering the logarithmic term for deflection angle, we obtain the deflection angle $\hat $ and corresponding parameters $\bar{a}$ and $\bar{b}$. Finally, by using the relations between the observables and lensing parameters, we estimate the observables such ...
Sadeghi, J., Vaez, H.
openaire   +2 more sources

STRONG GRAVITATIONAL LENSING AND ITS COSMIC CONSTRAINTS [PDF]

Modern Physics Letters A, 2013
In this paper, we propose a new method to use the strong lensing data sets to constrain a cosmological model. By taking the ratio [Formula: see text] as cosmic observations, one can completely eliminate the uncertainty caused by the relation σSIS= fEσ0which characterizes the relation between the stellar velocity dispersion σ0and the velocity dispersion
Wang, Nannan, Xu, Lixin
openaire   +2 more sources

Study of Errors in Strong Gravitational Lensing [PDF]

The Astrophysical Journal, 2008
We examine the accuracy of strong gravitational lensing determinations of the mass of galaxy clusters by comparing the conventional approach with the numerical integration of the fully relativistic null geodesic equations in the case of weak gravitational perturbations on Robertson-Walker metrics.
Kling, Thomas P., Frittelli, S.
openaire   +3 more sources

Wave Optics, Interference, and Decoherence in Strong Gravitational Lensing

Space Science Reviews
Wave-optical effects in gravitational lensing have long been predicted, and with the discovery of populations of compact transients such as gravitational wave events and fast radio bursts, may soon be observed.
C. Leung, D. Jow, Prasenjit Saha, Liang Dai, M. Oguri, L. Koopmans   +5 more
semanticscholar   +1 more source

Strong gravitational lensing by a strongly naked null singularity [PDF]

Physical Review D, 2020
We study strong gravitational lensing in a static, spherically symmetric, naked singularity spacetime, without a photon sphere. The nature of the singularity is found to be lightlike.
Suvankar Paul
semanticscholar   +1 more source

Magnetic Lensing near Ultramagnetized Neutron Stars [PDF]

, 1999
Extremely strong magnetic fields change the vacuum index of refraction. This induces a lensing effect that is not unlike the lensing phenomenon in strong gravitational fields.
Adler, Arzoumanian, Baring, Baring, Berestetskii, Dittrich, Erber, Gold, Greenstein, Gudmundsson, Hernquist, Hernquist, Hewish, Heyl, Heyl, Heyl, Heyl, Heyl, Heyl, Heyl, Heyl, Jeremy S. Heyl, Klein, Klein, Kouveliotou, Kouveliotou, Landau, Mielnieczuk, Nir J. Shaviv, Page, Pavlov, Rajagopal, Schaaf, Schaaf, Shapiro, Shibanov, Thompson, Thompson, Vasisht, Yoram Lithwick   +39 more
core   +3 more sources

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