Results 71 to 80 of about 56,380 (334)

Nova Geminorum 1912 and the Origin of the Idea of Gravitational Lensing

, 2007
Einstein's early calculations of gravitational lensing, contained in a scratch notebook and dated to the spring of 1912, are reexamined. A hitherto unknown letter by Einstein suggests that he entertained the idea of explaining the phenomenon of new stars
A. Retter, Albert Einstein, Arthur S. Eddington, Emil Arnold Budde, Emil Arnold Budde, Emil Arnold Budde, H. Ludendorff, Hermann Fernau, Hilmar W. Duerbeck, J. Fischer-Petersen, John D Norton, Jürgen Renn, Klaus Hentschel, Klaus Hentschel, Leon Campbell, Michael M. Shara, Oliver J Lodge, Orest Chwolson, R. Werner, Ragnar Furuhjelm, Tilman Sauer   +20 more
core   +2 more sources

Gravitational lensing in Weyl gravity [PDF]

Physical Review D, 2019
14 pages; v2: published ...
Oğuzhan Kaşıkçı, Cemsinan Deliduman
openaire   +3 more sources

A gamified formative question bank to enhance student learning and engagement in a foundational medical science course

Anatomical Sciences Education, EarlyView.
Abstract While gamified learning platforms show promise for engaging digital learners and promoting active learning, evidence of their effectiveness in predicting academic outcomes remains limited. This study examined how engagement patterns and incentives impact academic outcomes in a gamified environment to determine whether a formative question bank
Mohammad Aldalou, Angel Laboy, Laura E. Fraser, Jeremey Walker, William S. Brooks, Brook Hubner   +5 more
wiley   +1 more source

Lensing Point-spread Function of Coherent Astrophysical Sources and Nontrivial Wave Effects

The Astrophysical Journal
Most research on astrophysical lensing has been conducted using the geometric optics framework, where there exists a clear concept of lensing images. However, wave optics effects can be important for coherent sources, e.g., pulsars, fast radio bursts ...
Xun Shi
doaj   +1 more source

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

Effects of early dark energy on strong cluster lensing [PDF]

, 2006
We use the semi-analytic method developed by Fedeli et al. for computing strong-lensing optical depths to study the statistics of gravitational arcs in four dark-energy cosmologies. Specifically, we focus on models with early dark energy and compare them
Bartelmann, Bartelmann, Bartelmann, Bartelmann, Bartelmann, Benson, Bond, Brax, C. Fedeli, Caldwell, Cassano, Chandrasekhar, Dalal, Dolag, Doran, Doran, Fedeli, Ferreira, Gladders, Goldstein, Hasinger, Hawkins, Keeton, Lacey, Li, M. Bartelmann, Manera, Maor, Meneghetti, Meneghetti, Meneghetti, Meneghetti, Mota, Navarro, Navarro, Peebles, Peebles, Press, Randall, Readhead, Rebolo, Riess, Smail, Somerville, Spergel, Tegmark, Thompson, Torri, Wambsganss, Wang, Wetterich, Wetterich, Zaritsky   +52 more
core   +1 more source

Youth activism in Poland: Perceptions, participation and diverging perspectives from young people and activists

British Educational Research Journal, EarlyView.
Abstract Recent years have seen a growing scholarly interest in youth activism (YA), a phenomenon often viewed as a positive development in response to declining civic and political engagement among young people. However, most of the research focuses on the activists themselves and gives less attention to how YA is perceived by the broader youth ...
Martyna Elerian, Miri Yemini, Katarzyna Jasikowska   +2 more
wiley   +1 more source

Gravitational lensing effects of supermassive black holes in cluster environments [PDF]

, 2022
Guillaume Mahler, Priyamvada Natarajan, Mathilde Jauzac, Johan Richard   +3 more
openalex   +1 more source

Strong gravitational lensing in a squashed Kaluza-Klein black hole spacetime

, 2010
We investigate the strong gravitational lensing in a Kaluza-Klein black hole with squashed horizons. We find the size of the extra dimension imprints in the radius of the photon sphere, the deflection angle, the angular position and magnification of the ...
E. Jung, Jiliang Jing, K. S. Virbhadra, Songbai Chen, Yue Liu   +4 more
core   +1 more source

The spread of non‐native species

Biological Reviews, EarlyView.
ABSTRACT The global redistribution of species through human agency is one of the defining ecological signatures of the Anthropocene, with biological invasions reshaping biodiversity patterns, ecosystem processes and services, and species interactions globally.
Phillip J. Haubrock, Ali Serhan Tarkan, Irene Martín‐Forés, Stelios Katsanevakis, Ronaldo Sousa, Ismael Soto, Andy J. Green, Antonín Kouba, Teun Everts, Victoria Dominguez Almela, Nadège Belouard, Cang Hui, Jamie Bojko, Victor Deklerck, Margaux Boeraeve, Franz Essl, J. Robert Britton   +16 more
wiley   +1 more source