Strong Lensing by Galaxies

Abstract

Strong lensing is a powerful tool to address three major astrophysical issues: understanding the spatial distribution of mass at kpc and sub-kpc scale, where baryons and dark matter interact to shape galaxies as we see them; determining the overall geometry, content, and kinematics of the universe; studying distant galaxies, black holes, and active nuclei that are too small or too faint to be resolved or detected with current instrumentation. After summarizing strong gravitational lensing fundamentals, I present a selection of recent important results. I conclude by discussing the exciting prospects of strong gravitational lensing in the next decade.

ARA&A Vol 48 in press; preprint version prepared by the author.

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• Single-object Imaging and Spectroscopy to Enhance Dark Energy Science from LSST
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• Differentiable probabilistic programming for strong gravitational lensing
• Enhancing Gravitational Lens Study with Deep Learning: A Study on Effects of Dropout Regularization
• The two-component virial theorem and the acceleration-discrepancy relation
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• Extragalactic astrophysics with next-generation CMB experiments
• Testing General Relativity on Galactic Scales via DESI-BAO and Strong Lensing: Circumventing Assumptions on the Hubble Constant, Sound Horizon, and Dark Energy
• TDCOSMO XXI. Accurate stellar velocity dispersions of the SL2S lens sample and the fundamental plane of the lensing mass
• Oscillation Baryogenesis via Ultraviolet Dark Matter Freeze-In
• Milky-Way-like stars in a galaxy core 8 billion years ago revealed by gravitational lensing
• Breaking the Mass-sheet Degeneracy in Time-delay Cosmology with Lensed and Unlensed Type Ia Supernovae