# Particle Physics Seminar

## "Time Delay Cosmology"

#### Presented by Eric Linder, Berkeley/LBNL

Thursday, September 24, 2015, 3:00 pm — Small Seminar Room, Bldg. 510

Thousands of strong gravitational lenses will be found by time domain surveys such as DES and LSST. Time delays between multiple images can be used to form a geometric time delay distance, a cosmological probe with some unique sensitivities and complementarities. I consider three aspects: 1) the cosmology impact, 2) the statistics challenge of accurate estimation of time delays between noisy, gappy lightcurves and recent results from LSST's blind Time Delay Challenge, and 3) optimization of limited followup resources. I will also present new theory and instrument concepts for cosmic redshift drift, a direct probe of cosmic acceleration with a Hubble time delay. Methods for both probes have interesting overlaps with exoplanet searches.

Hosted by: Anze Slosar

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