Multiply imaged time-variable sources can be used to measure absolute distances as a
function of redshifts and thus determine cosmological parameters, chiefly the Hubble …

Recent rapid progress in time domain surveys makes it possible to detect various types of
explosive transients in the Universe in large numbers, some of which will be gravitationally …

Strong gravitational lens systems with time delays between the multiple images allow
measurements of time-delay distances, which are primarily sensitive to the Hubble constant …

Ongoing and future imaging surveys represent significant improvements in depth, area, and
seeing compared to current data sets. These improvements offer the opportunity to discover …

In 1964, Refsdal hypothesized that a supernova whose light traversed multiple paths around
a strong gravitational lens could be used to measure the rate of cosmic expansion. We …

Dual supermassive black holes (SMBHs) at∼ kiloparsec scales are the progenitor
population of SMBH mergers and play an important role in understanding the pairing and …

Strong gravitational lenses are now being routinely discovered in wide-field surveys at (sub-
) millimeter wavelengths. We present Submillimeter Array (SMA) high-spatial resolution …

We present optical and near-infrared spectroscopy obtained at Keck, Very Large Telescope,
and Gemini for a sample of 36 secure strong gravitational lens systems and 17 candidates …

Strong-gravitational lens systems with quadruply imaged quasars (quads) are unique
probes to address several fundamental problems in cosmology and astrophysics. Although …

We present a new sample of galaxy-scale strong gravitational lens candidates, selected
from 904 deg2 of Data Release 4 of the Kilo-Degree Survey, ie the 'Lenses in the Kilo …