Results 51 to 60 of about 49,349 (281)

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

A deconstruction of methods to derive one-point lensing statistics

The Open Journal of Astrophysics
Gravitational lensing is a crucial tool for exploring cosmic phenomena, providing insights into galaxy clustering, dark matter, and dark energy. Given the substantial computational demands of $N$-body simulations, approximate methods like $\texttt ...
Viviane Alfradique, Tiago Castro, Valerio Marra, Miguel Quartin, Carlo Giocoli, Pierluigi Monaco   +5 more
doaj   +1 more source

Gear Up for the Action Replay: Leveraging Lensing for Enhanced Gravitational-wave Early Warning

The Astrophysical Journal Letters, 2023
Premerger gravitational-wave (GW) sky localization of binary neutron star (BNS) and neutron star–black hole (NSBH) coalescence events would enable telescopes to capture precursors and electromagnetic (EM) emissions around the time of the merger.
Sourabh Magare, Shasvath J. Kapadia, Anupreeta More, Mukesh Kumar Singh, Parameswaran Ajith, A. N. Ramprakash   +5 more
doaj   +1 more source

Mapping the 3-D Dark Matter potential with weak shear

, 2002
We investigate the practical implementation of Taylor's (2002) 3-dimensional gravitational potential reconstruction method using weak gravitational lensing, together with the requisite reconstruction of the lensing potential.
A. N. Taylor, Bernardeau F., Bunn E. F., D. J. Bacon, Erben T., Massey R., Peacock J. A., Peebles P. J. E., Taylor A. N., van Waerbeke L., Wittman D.   +10 more
core   +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

Probing the dark matter issue in f(R)-gravity via gravitational lensing [PDF]

, 2011
For a general class of analytic f(R)-gravity theories, we discuss the weak field limit in view of gravitational lensing. Though an additional Yukawa term in the gravitational potential modifies dynamics with respect to the standard Newtonian limit of ...
A. De Felice, A. Stabile, A.G. Lyne, A.J. Romanowsky, C. Bogdanos, C. Frigerio Martins, C. Tortora, C. Tortora, C. Tortora, C.M. Will, C.P.L. Berry, D. Clowe, D.J. Kapner, E. De Filippis, E. De Filippis, E. Komatsu, J. Binney, J. Näf, J. Näf, J.D. Bekenstein, K.S. Stelle, M. Bradač, M. Burgay, M. Lubini, M. Sereno, M.W. Auger, N.R. Napolitano, P. Schneider, Ph. Jetzer, R.H. Sanders, S. Bellucci, S. Capozziello, S. Capozziello, S. Capozziello, S. Capozziello, S. Capozziello, S. Capozziello, S. Capozziello, S. Capozziello, S. Capozziello, S. Capozziello, S. Capozziello, S. Capozziello, S. Capozziello, S. Capozziello, S. Capozziello, S. Capozziello, S. Capozziello, S. Capozziello, S. Mendoza, S. Nojiri, S. Nojiri, S. Nojiri, S. Nojiri, S. Nojiri, S. Weinberg, S.M. Carroll, T. Clifton, T. Faulkner, V.F. Cardone, V.F. Cardone, Y. Sobouti, Y. Sofue   +62 more
core   +1 more source

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

Revealing dark matter dress of primordial black holes by cosmological lensing

Physics Letters B, 2023
Stellar-mass primordial black holes (PBHs) from the early Universe can directly contribute to the gravitational wave (GW) events observed by LIGO, but can only comprise a subdominant component of the dark matter (DM).
Masamune Oguri, Volodymyr Takhistov, Kazunori Kohri   +2 more
doaj   +1 more source

Reconstruction of Gravitational Lensing Using WMAP 7-Year Data

, 2011
Gravitational lensing by large scale structure introduces non-Gaussianity into the Cosmic Microwave Background and imprints a new observable, which can be used as a cosmological probe. We apply a four-point estimator to the Wilkinson Microwave Anisotropy
Feng, Chang, Keating, Brian, Paar, Hans P., Zahn, Oliver   +3 more
core   +1 more source

The Gravitational Lensing in Redshift-space Correlation Functions of Galaxies and Quasars [PDF]

, 2000
The gravitational lensing, as well as the velocity field and the cosmological light-cone warp, changes the observed correlation function of high-redshift objects.
Ballinger W. E., Bartelmann M., Bernardeau F., Boyle B. J., Dolag K., Kaiser N., Peacock J. A., Suto Y., Villumsen J. V.   +8 more
core   +3 more sources