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Lensing Degeneracies Revisited

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arxiv astro-ph/0006432 v1 pith:73WILOEV submitted 2000-06-29 astro-ph

Prasenjit Saha (QMW , London) This is my paper
classification astro-ph
keywords lensingdegeneraciescosmologicaldegeneracyabsoluteappearappliesarrival-time
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This paper shows that the mass-sheet degeneracy and other degeneracies in lensing have simple geometrical interpretations: they are mostly rescalings of the arrival-time surface. Different degeneracies appear in Local Group lensing and in cosmological lensing, because in the former the absolute magnification is measured but the image structure is not resolved, whereas in the latter the reverse usually applies. The most dangerous of these is a combination we may call the `mass-disk degeneracy' in multiply-imaging galaxy lenses, which may lead to large systematic uncertainties in estimates of cosmological parameters from these systems.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. A new $H_0$ measurement with SNe Requiem and Encore using $\texttt{Gravity.jl}$

    astro-ph.CO 2026-06 unverdicted novelty 4.0 of 10

    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.

  2. A new $H_0$ measurement with SNe Requiem and Encore using $\texttt{Gravity.jl}$

    astro-ph.CO 2026-06 unverdicted novelty 4.0 of 10

    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.

  3. A new $H_0$ measurement with SNe Requiem and Encore using $\texttt{Gravity.jl}$

    astro-ph.CO 2026-06 unverdicted novelty 4.0 of 10

    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.

  4. Cosmology Intertwined: A Review of the Particle Physics, Astrophysics, and Cosmology Associated with the Cosmological Tensions and Anomalies

    astro-ph.CO 2022-03 accept novelty 2.0 of 10

    The paper reviews cosmological tensions including the H0 and S8 discrepancies and explores new physics models that could explain them.

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