Results 61 to 70 of about 340,378 (352)

Detecting strong gravitational lensing of gravitational waves with TianQin

Physical Review D, 2023
When gravitational waves (GWs) pass by a massive object on its way to Earth, a strong gravitational lensing effect will happen. Thus, the GW signal will be amplified, deflected, and delayed in time. Through analyzing the lensed GW waveform, physical properties of the lens can be inferred. On the other hand, neglecting lensing effects in the analysis of
Xin-yi Lin, Jian-dong Zhang, Liang Dai, Shun-Jia Huang, Jianwei Mei   +4 more
openaire   +4 more sources

Black and minority ethnic student teachers' stories as empirical documents of hidden oppressions: Using the personal to turn towards the structural

British Educational Research Journal, Volume 48, Issue 6, Page 1145-1160, December 2022., 2022
Abstract Racism, as a covert but pervasive presence in teacher education in England, remains a major structural issue and its effects on student teachers who are Black and Asian are real and troubling. Their personal stories reveal multiple challenges and present empirical evidence that can usefully be analysed to examine their experience of daily ...
Diane Warner
wiley   +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

Precision Modeling of JWST's First Cluster Lens SMACS J0723.3–7327

The Astrophysical Journal, 2023
Exploiting the fundamentally achromatic nature of gravitational lensing, we present a lens model for the massive galaxy cluster SMACS J0723.3−7323 (SMACS J0723; z = 0.388) that significantly improves upon earlier work.
Guillaume Mahler, Mathilde Jauzac, Johan Richard, Benjamin Beauchesne, Harald Ebeling, David Lagattuta, Priyamvada Natarajan, Keren Sharon, Hakim Atek, Adélaïde Claeyssens, Benjamin Clément, Dominique Eckert, Alastair Edge, Jean-Paul Kneib, Anna Niemiec   +14 more
doaj   +1 more source

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

How do green knowledge management and green technology innovation impact corporate environmental performance? Understanding the role of green knowledge acquisition

Business Strategy and the Environment, Volume 32, Issue 1, Page 551-569, January 2023., 2023
Abstract Increasing regulatory obligations to adapt and execute environmentally friendly operations make it critical for businesses to pursue strategies that can strengthen their competitive edge in the market. Academics and practitioners alike have recently gravitated toward exploring how knowledge acquisition activities might improve business ...
Saumyaranjan Sahoo, Anil Kumar, Arvind Upadhyay   +2 more
wiley   +1 more source

Two Lensed Star Candidates at z ≃ 4.8 behind the Galaxy Cluster MACS J0647.7+7015

The Astrophysical Journal Letters, 2023
We report the discovery of two extremely magnified lensed star candidates behind the galaxy cluster MACS J0647.7+015 using recent multiband James Webb Space Telescope (JWST) NIRCam observations. The star candidates are seen in a previously known, z _phot
Ashish Kumar Meena, Adi Zitrin, Yolanda Jiménez-Teja, Erik Zackrisson, Wenlei Chen, Dan Coe, Jose M. Diego, Paola Dimauro, Lukas J. Furtak, Patrick L. Kelly, Masamune Oguri, Brian Welch, Abdurro’uf, Felipe Andrade-Santos, Angela Adamo, Rachana Bhatawdekar, Maruša Bradač, Larry D. Bradley, Tom Broadhurst, Christopher J. Conselice, Pratika Dayal, Megan Donahue, Brenda L. Frye, Seiji Fujimoto, Tiger Yu-Yang Hsiao, Vasily Kokorev, Guillaume Mahler, Eros Vanzella, Rogier A. Windhorst   +28 more
doaj   +1 more source

Exploring the Possible Evolution of the Mass Density Power-law Index of Strong Gravitational Lenses with a Model-independent Method

The Astrophysical Journal, 2023
In this work, we adopt a cosmological model-independent approach for the first time to test the question of whether the mass density power-law index ( γ ) of strong gravitational lensing systems (SGLSs) evolves with redshift, and the joint light-curve ...
Jian Hu
doaj   +1 more source

Resolving the discrepancy between X-ray and gravitational lensing mass measurements for clusters of galaxies [PDF]

, 1997
We present a detailed comparison of mass measurements for clusters of galaxies using ASCA and ROSAT X-ray data and constraints from strong and weak gravitational lensing.
Allen, S. W.
core   +2 more sources

Phase effects from strong gravitational lensing of gravitational waves [PDF]

Physical Review D, 2020
Assessing the probability that two or more gravitational wave (GW) events are lensed images of the same source requires an understanding of the properties of the lensed images.
J. Ezquiaga, D. Holz, Wayne Hu, Macarena Lagos, R. Wald   +4 more
semanticscholar   +1 more source