Results 41 to 50 of about 63,611 (230)

Photon‐Sphere Modes in Curved Optical Microcavities: A Black‐Hole Analogue Laser

Advanced Science, EarlyView.
An optical analogue of a Schwarzschild black hole is realized using curved microcavities that preserve light‐like geodesics. A new family of laser modes confined around the photon sphere is identified alongside conventional whispering‐gallery modes. Analytical theory, numerical simulations, and experiments reveal curvature‐induced confinement, enabling
Chenni Xu, Aswathy Sundaresan, Nazire‐Begüm Kazkal, Clement Lafargue, Lior Zarfaty, Li‐Gang Wang, Ofek Birnholtz, Dominique Decanini, Melanie Lebental, Patrick Sebbah   +9 more
wiley   +1 more source

Evaporation‐Driven Solutal Marangoni Control of Rayleigh–Taylor Instability in Inverted Films

Advanced Science, EarlyView.
Inverted liquid films, like paint on a ceiling, are inherently unstable under gravity. This work shows that selective evaporation in volatile binary mixtures generates solutal Marangoni stresses that either suppress or amplify the Rayleigh Taylor instability.
Minwoo Choi, Hyejoon Jun, Hyoungsoo Kim
wiley   +1 more source

IMAGES DISTRIBUTION OF BINARY SYMMETRICAL GRAVITATIONAL LENS

Odessa Astronomical Publications, 2019
In this paper, we study the distribu- tion of images from a point source in N - point gravi- tational lenses. It is well known that in a Schwarzschild lens (N = 1) from a point source, there are always two images.
A. T. Kotvytskiy, S. D. Bronza, V. Yu. Shablenko   +2 more
doaj   +1 more source

Pixelated Reconstruction of Foreground Density and Background Surface Brightness in Gravitational Lensing Systems Using Recurrent Inference Machines

The Astrophysical Journal, 2023
Modeling strong gravitational lenses in order to quantify distortions in the images of background sources and to reconstruct the mass density in foreground lenses has been a difficult computational challenge.
Alexandre Adam, Laurence Perreault-Levasseur, Yashar Hezaveh, Max Welling   +3 more
doaj   +1 more source

First Observation of Parallax in a Gravitational Microlensing Event [PDF]

, 1995
We present the first detection of parallax effects in a gravitational microlensing event. Parallax in a gravitational microlensing event observed only from the Earth appears as a distortion of the lightcurve due to the motion of the Earth around the Sun.
A. W. Rodgers,, B. A. Peterson,, Benetti S., C. Alcock,, C. W. Stubbs,, D. Alves,, D. P. Bennett,, J. Guern,, K. C. Freeman,, K. Griest,, K. H. Cook,, M. J. Lehner,, M. R. Pratt,, P. J. Quinn,, R. A. Allsman,, Refsdal S., S. L. Marshall,, T. S. Axelrod,, Udalski A., Udalski A., W. Sutherland   +20 more
core   +2 more sources

Deformation‐Induced Formation of Stray Grains in Additive Manufacturing of Single Crystals

Advanced Science, EarlyView.
Stray grain formation severely limits the additive manufacturing of single‐crystal alloys. By integrating in situ synchrotron techniques, ex situ characterization, and multi‐scale multi‐physics modeling, the authors reveal that stray grains originate from dislocations at the solid‐liquid interface, rather than thermal supercooling in conventional ...
Dongsheng Zhang, Zixu Guo, Yuxiao Li, Lu Wang, Yu Wu, Darui Sun, Wentao Yan, Yuanyuan Guo, Han Wang, Wei Liu, Ye Tao, Bingbing Zhang   +11 more
wiley   +1 more source

Mimicking Symmetry‐Breaking Einstein Ring by Optical Lens

Advanced Photonics Research
The celebrated theory of general relativity has inspired research on optical simulations using artificial microstructures to mimic curved space–times.
Jun‐Liang Duan, Wen Xiao, Minyong Guo, Tong Liu, Huanyang Chen, Jin‐Hui Chen   +5 more
doaj   +1 more source

QUASI-ANALYTICAL METHOD FOR IMAGES CONSTRUCTION FROM GRAVITATIONAL LENSES

Odessa Astronomical Publications, 2016
One of the main problems in the study of system of equations of the gravitational lens, is the computation of coordinates from the known position of the source. In the process of computing finds the solution of equations with two unknowns. The problem is
A. T. Kotvytskiy, S. D. Bronza
doaj   +1 more source

Light‑Driven Propulsion of Graphene Aerogels in Microgravity

Advanced Science, EarlyView.
Ultralight graphene aerogels convert laser light into thrust. Parabolic‐flight experiments directly compare their motion in microgravity and at 1 g, revealing order‐of‐magnitude enhancements in distance, velocity, and transient thrust when weight and friction are removed (∼50 times enhancement).
Omnia Khattab, Rami Elkaffas, Basel Altawil, Omar Alsuwaidi, Afnan Almubashir, Claire Perfetti, Shanavas Shajahan, Marco Braibanti, Sean Swei, Carlo Saverio Iorio, Yarjan Abdul Samad   +10 more
wiley   +1 more source

CTQ 414: A New Gravitational Lens

, 1999
We report the discovery and ground based observations of the new gravitational lens CTQ 414. The source quasar lies at a redshift of z = 1.29 with a B magnitude of 17.6.
Alan Dressler, Claeskens J.-F., Joshua N. Winn, José Maza, Maza J., Nicholas D. Morgan, Paul L. Schechter, Refsdal S., Rosvick J. M.   +8 more
core   +2 more sources