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Lectures on Gravitational Lensing
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These lectures give an introduction to Gravitational Lensing. We discuss lensing by point masses, lensing by galaxies, and lensing by clusters and larger-scale structures in the Universe. The relevant theory is developed and applications to astrophysical problems are discussed.
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Cited by 22 Pith papers
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JWST absorption line spectroscopy with SPURS: ISM covering fractions and kinematics in individual galaxies at $z=5-9$
JWST spectra of six z=5-9 galaxies show low-ionization covering fractions of 0.2-0.9 and diverse kinematics including blueshifted outflows, indicating heterogeneous multiphase ISM.
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Microlensing of fast and slow compact objects
Microlensing surveys constrain fast and slow compact objects at masses and densities differing by orders of magnitude from dark matter limits due to speed-mass degeneracy in Einstein crossing times.
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Three-dimensional wave optics for weak-field lensing of gravitational waves
A perturbative 3D Green's-function framework yields Born and post-Born weak-field GW lensing, including finite-distance and O(G^{2}) GR corrections controlled by GM ω b/χ_eff.
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Probing Parity Violation with Weak Lensing Trispectrum
A parity-odd weak lensing convergence trispectrum is derived and forecast to be detectable with DES Y3/LSST Y10-like surveys under optimistic template amplitudes.
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Global structure of the time delay likelihood
Time delay likelihoods modeled with Gaussian processes develop a boundary-driven W-shape with a global maximum at the true delay and rises at observation window edges, misleading nested sampling and biasing H0 high.
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Constraints from the Giant Arc in Abell 370. A New Framework for Understanding Systematic Errors in Cluster Lens Modeling. IV. Constraints from the Giant Arc in Abell 370
Pixel-level source reconstruction of the Abell 370 giant arc yields a locally optimized cluster lens model with smaller arc residuals than standard HFF models.
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Speeding up Gravitational Lens Mass Models with Machine Learning: Applications in X-ray Astronomy
A fully connected network trained on millions of simulated quads predicts SIE lens mass and ellipticity from four image positions, cutting optimisation time for real and simulated quadruply lensed quasars to minutes.
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Constraints on Primordial Black Hole Dressed by Dark Matter Halo from Microlensing Effect of Fast Radio Bursts
A new conversion formula turns monochromatic bare-PBH microlensing bounds into extended-mass dressed-PBH bounds, and a 10^5-FRB forecast places f_PBH near 10^-4.
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Multi-wavelength Constraints on the Transient EP250905a
EP250905a is best explained as a mildly off-axis structured-jet afterglow at z=2.714, possibly weakly magnified by a foreground galaxy at z=0.374.
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S-PLUS Clusters And Large-scale Environments (SCALE): II. PZWav versus redMaPPer identification of eRosita groups
A probabilistic Hausdorff-distance matching of PZWav/AME optical systems to eRASS1 X-ray contours yields multi-wavelength group/cluster catalogs with tunable purity and improved low-mass completeness versus redMaPPer.
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Interferometric signature of higher-order images in a parametrized framework
The step heights and periodicities of the black-hole photon-ring staircase in the visibility function depend in a calculable way on the Rezzolla-Zhidenko metric parameters.
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A new $H_0$ measurement with SNe Requiem and Encore using $\texttt{Gravity.jl}$
A Gravity.jl strong-lensing model of MACS J0138 yields H0 = 67.0 +9.3/-7.8 km/s/Mpc from the measured time delays of SN Requiem and SN Encore.
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A new $H_0$ measurement with SNe Requiem and Encore using $\texttt{Gravity.jl}$
A Bayesian parametric lens model of MACS J0138 using Gravity.jl yields H0 = 67.0 +9.3/-7.8 km/s/Mpc from the time delays of SN Requiem and SN Encore.
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A new $H_0$ measurement with SNe Requiem and Encore using $\texttt{Gravity.jl}$
New H0 = 67.0 +9.3/-7.8 km/s/Mpc from joint lens-model fit to time delays of SN Requiem and SN Encore in MACS J0138.0-2155.
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Constraining Orbital Eccentricity of a Supermassive Black Hole Binary Candidate PKS 2131-0211
Bayesian fitting of an eccentric Keplerian orbit to the radio light curve of PKS 2131-021 gives e = 0.053 ± 0.015 without red noise but favors a circular orbit plus DRW noise with e < 0.15.
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COOL-LAMPS IX: A Rare Duo of Quasars Each Lensed by a Single Massive Galaxy Cluster
A single galaxy cluster lenses two quasars (one Type I at z=1.524, one dust-obscured Type II at z=1.939) into four images each, yielding a projected mass of ~3.3e14 solar masses within 500 kpc and time delays of hundr...
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A Forward, Analytic, Differentiable, Geometric (But Inflexible) Lens Model
The SIEP+XS_|| model supplies an analytic forward mapping from source to image plane for gravitational lensing, offering large speed gains and geometric checks but with an inflexible elliptical equipotential.
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A cosmographic analysis using DESI-DR2 and strong lensing: II. Distance Ratio measurements
A distance-sum-rule cosmographic fit combining strong-lensing distance ratios, three Type Ia supernova compilations, and DESI-DR2 BAO constrains Omega_k0, q0, j0, s0 and finds consistency with flat Lambda-CDM, but wit...
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Gravitational Lensing as an Optical Framework for Modified Gravity Theories
Gravitational lensing is recast as an optical phenomenon governed by effective refractive index, yielding closed-form deflection angles and Einstein radii for modified gravity models including deep-MOND, Yukawa, and p...
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Strong Gravitational Lensing with the James Webb Space Telescope
Strong gravitational lensing paired with JWST enables magnified high-resolution views of distant sources and improved constraints on dark matter.
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Strong Gravitational Lensing with the James Webb Space Telescope
A review summarizing recent advances in strong gravitational lensing applications and near-future prospects with the James Webb Space Telescope.
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Weak Gravitational Lensing: A Brief Overview
The paper reviews standard derivations of light deflection in curved spacetime and presents a unified geometric approach for static and rotating gravitational fields.
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