Institute of Astronomy

Cosmology with Gravitational Lens Time Delays

SpeakerTalk DateTalk Series
Sherry Suyu (MPA)30 May 2019Institute of Astronomy Colloquia

Abstract

Strong gravitational lenses with measured time delays between the multiple
images can be used to determine the Hubble constant that sets the expansion
rate of the Universe. Measuring the Hubble constant is crucial for inferring
properties of dark energy, spatial curvature of the Universe and neutrino
physics. I will describe techniques for measuring the Hubble constant from
lensing with a realistic account of systematic uncertainties. A program
initiated to measure the Hubble constant to less than 3.5% in precision from strong
lenses is in progress, and I will present the latest results and their
implications. Search is underway to find new lenses in imaging surveys. An
exciting discovery of the first strongly lensed supernova offered a rare
opportunity to perform a true blind test of our modeling techniques. I will
show the bright prospects of gravitational lens time delays as an
independent and competitive cosmological probe.

Presentation

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