Gravitational lensing in braneworld gravity: formalism and applications [PDF]
Classical and Quantum Gravity, 2008 In this article, we develop a formalism which is different from the standard lensing scenario and is necessary for understanding lensing by gravitational fields which arise as solutions of the effective Einstein equations on the brane. We obtain general expressions for measurable quantities such as time delay, deflection angle, Einstein ring and ...
Pal, Supratik, Kar, Sayan
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Complex formalism in the theory of gravitational lensing and the geometry of caustics [PDF]
Bulletin of Taras Shevchenko National University of Kyiv. Astronomy, 2021 In the theory of gravitational lensing, the critical curves and caustics of the lens mapping are of particular interest. The most striking features of this phenomenon take place just when the source is in the vicinity of the caustic of the gravitational lens system.
A. N. Alexandrov
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Gravitational Lensing Formalism in a Curved Arc Basis: A Continuous Description of Observables and Degeneracies from the Weak to the Strong Lensing Regime [PDF]
The Astrophysical Journal, 2021 Abstract Gravitationally lensed curved arcs provide a wealth of information about the underlying lensing distortions. Extracting precise lensing information from extended sources is a key component in many studies aiming to answer fundamental questions about the universe.
Simon Birrer
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Simulation Of Gravitational Lensing In The Roulette Formalism [PDF]
ECMS 2023 Proceedings edited by Enrico Vicario, Romeo Bandinelli, Virginia Fani, Michele Mastroianni, 2023 Gravitational lensing refers to the deflection of light by the gravity of celestial bodies, often predominantly composed of dark matter. Seen through a gravitational lens, the images of distant galaxies appear distorted. A range of mathematical frameworks exist to model the lensing effect, but reconstructing the dark lens mass remains a difficult ...
Hans Georg Schaathun +5 more
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Gravitational lensing beyond geometric optics: I. Formalism and observables [PDF]
General Relativity and Gravitation, 2019 The laws of geometric optics and their corrections are derived for scalar, electromagnetic, and gravitational waves propagating in generic curved spacetimes. Local peeling-type results are obtained, where different components of high-frequency fields are shown to scale with different powers of their frequencies.
Abraham I. Harte
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Plasma lensing in comparison to gravitational lensing -- Formalism and degeneracies [PDF]
, 2020 Gravitational and plasma lensing share the same mathematical formalism in the limit of geometrical optics. Both phenomena can be effectively described by a projected, two-dimensional deflection potential whose gradient causes an instantaneous light deflection in a single, thin lens plane.
Wagner, Jenny, Er, Xinzhong
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Generalised model-independent characterisation of strong gravitational lenses – VI. The origin of the formalism intrinsic degeneracies and their influence on H0 [PDF]
Monthly Notices of the Royal Astronomical Society, 2019 13 pages, 3 figures, accepted for publication in MNRAS, comments very ...
Jenny Wagner
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Generalised model-independent characterisation of strong gravitational lenses [PDF]
Astronomy & Astrophysics, 2018 Based on the standard gravitational lensing formalism with its effective, projected lensing potential in a given background cosmology, we investigated under which transformations of the source position and of the deflection angle the observable properties of the multiple images remain invariant.
Wagner, Jenny
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Particle dark matter searches in the anisotropic sky [PDF]
Frontiers in Physics, 2014 Anisotropies in the electromagnetic emission produced by dark matter annihilation or decay in the extragalactic sky are a recent tool in the quest for a particle dark matter evidence.
Nicolao eFornengo +3 more
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Intrinsic and extrinsic correlations of galaxy shapes and sizes in weak lensing data [PDF]
, 2021 The subject of this paper is to build a physical model describing shape and size correlations of galaxies due to weak gravitational lensing and due to direct tidal interaction of elliptical galaxies with gravitational fields sourced by the cosmic large ...
Durrer, Ruth +2 more
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