Results 71 to 80 of about 1,077 (214)

Raychaudhuri equation and Weyl-driven shear: A weak-field approach to lensing and gravitational waves

Physics Letters A
The letter studies phenomena like gravitational wave propagation and gravitational lensing using the celebrated Raychaudhuri equation (RE) in the weak field limit. Newtonian analogue of Relativistic RE has been explored. In doing so, role of shear has been found to be extremely important in explaining these phenomena. Consequently, the RE for shear has
Madhukrishna Chakraborty, Subenoy Chakraborty   +1 more
openaire   +2 more sources

Baryons, neutrinos, feedback and weak gravitational lensing [PDF]

, 2015
The effect of baryonic feedback on the dark matter mass distribution is generally considered to be a nuisance to weak gravitational lensing. Measurements of cosmological parameters are affected as feedback alters the cosmic shear signal on angular scales
Viola, M, Viola, M., Waerbeke, L., Harnois-Déraps, J., van Waerbeke, L, Heymans, C., Harnois-Déraps, J, Heymans, C   +7 more
core   +1 more source

The Effect of Intrinsic Alignments on Weak-lensing Statistics in Hydrodynamical Simulations

The Astrophysical Journal
The next generation of weak-gravitational-lensing surveys has the potential to place stringent constraints on cosmological parameters. However, their analysis is limited by systematics such as the intrinsic alignments of galaxies, which alter weak ...
Max E. Lee, Zoltán Haiman, Shivam Pandey, Shy Genel   +3 more
doaj   +1 more source

The cosmology dependence of the cluster weak-lensing mass bias

Astronomy & Astrophysics
Context. Measurements of the shear induced by weak gravitational lensing around galaxy cluster lines of sight are the gold standard for calibrating cluster observable–mass relations, enabling a robust and precise inference of cosmological parameters. The
Bocquet S., Fumagalli A., Davies C. T., Dolag K., Grandis S., Mohr J. J.   +5 more
doaj   +1 more source

Topological Point Defects in SmC* Liquid Crystals Under Mechanical Disturbance

Advanced Materials Interfaces, Volume 13, Issue 11, 9 June 2026.
Tangetial air jet shear inducess island formation and nucleates topological point defects in uniform SmC films. Island bounded by edge dislocation loops shrink and transform into isolated point defects under continued shear. Mechanical perturbatio provides a controllable route for defect engineering in smectric liquid crystal thin films.
Gunganist Kongklad, Vandana Molahalli, Apichart Pattanaporkratana, Nattaporn Chattham   +3 more
wiley   +1 more source

Simulating weak gravitational lensing for cosmology [PDF]

, 2011
This thesis will present a new cosmic shear analysis pipeline SUNGLASS (Simulated UNiverses for Gravitational Lensing Analysis and Shear Surveys). SUNGLASS is a pipeline that rapidly generates simulated universes for weak lensing and cosmic shear ...
Kiessling, Alina Anne
core  

Direct shear mapping - a new weak lensing tool [PDF]

, 2015
We have developed a new technique called direct shear mapping (DSM) to measure gravitational lensing shear directly from observations of a single background source.
De Burgh-Day, CO, Webster, RL, Hopkins, AM, Taylor, EN   +3 more
core   +2 more sources

Weak gravitational lensing and intrinsic galaxy alignments

, 2003
This thesis describes an investigation into weak gravitational lensing, a unique and powerful astronomical tool for the study of dark matter on large scales.
Miller, Lance, Heavens, Alan, Heymans, Catherine   +2 more
core   +2 more sources

COSMOLOGY, COSMOMICROPHYSICS AND GRAVITATION

Odessa Astronomical Publications, 2013
We derive approximate formulas for the coordinates and magnification of critical images of a point source in a vicinity of a cusp caustic arising in the gravitational lens mapping. In the lowest (zero-order) approximation, these formulas were obtained in
A. N. Alexandrov, V. I. Zhdanov, S. M. Koval   +2 more
doaj   +1 more source

Light‑Driven Propulsion of Graphene Aerogels in Microgravity

Advanced Science, Volume 13, Issue 33, 15 June 2026.
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