Results 71 to 80 of about 57,017 (311)

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

Phytoplankton Tune Local pH to Actively Modulate Circadian Gravitactic Behavior

Advanced Physics Research, EarlyView.
Diel vertical migration hides an unexpected twist: Phytoplankton quietly engineer their local pH landscape, splitting into behaviorally distinct sub‐groups which stay separated even in identical conditions. Circadian pH changes, occuring over the course of a day, reshape their gravitactic behavior and physiological functions in ways scientists have ...
Arkajyoti Ghoshal, Soumitree Mishra, Jayabrata Dhar, Hans‐Peter Grossart, Anupam Sengupta   +4 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

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

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

Weak gravitational lensing

25 pagers, 14 figures.
Prat, J., Bacon, D.
openaire   +2 more sources

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

Analogue gravitational lensing in optical Bose-Einstein condensates [PDF]

, 2021
Decheng Ma, Chenglong Jia, E. Solano, Lucas C. Céleri   +3 more
openalex   +1 more source

Hubble Constant, Lensing, and Time Delay in Relativistic MOND

, 2013
Time delay in galaxy gravitational lensing systems has been used to determine the value of Hubble constant. As in other dynamical phenomena at the scale of galaxy, dark matter is often invoked in gravitational lensing to account for the "missing mass ...
Chiu, Mu-Chen, Ko, Chung-Ming, Tian, Yong   +2 more
core   +1 more source

Global properties of gravitational lens maps in a Lorentzian manifold setting [PDF]

, 2000
In a general-relativistic spacetime (Lorentzian manifold), gravitational lensing can be characterized by a lens map, in analogy to the lens map of the quasi-Newtonian approximation formalism.
Perlick, Volker
core   +3 more sources