Speaker: Prof. Roger David Blandford
Director of the Kavli Institute for Particle Astrophysics and Cosmology
Time: 10:00AM, 11-3-2010
Abstract: As first pointed out by Refsdal, multiple images of a variable source created by a gravitational lens can provide a measurement of the Hubble constant. One of the complications limiting the accuracy of this technique is the combined effect of small deflections associated with lesser masses along the line of sight. A new formalism is presented for addressing this complication and it is applied to modeling the gravitational lens B1608+656.
Speaker: Dr. J. Anthony Tyson
Director of the Large Synoptic Survey Telescope
Institute: University of California, Davis
Time: 3:00PM 11-4-2009
Abstract: Images from the Large Synoptic Survey Telescope survey of the sky will be analyzed for a wide range of phenomena. With 20 trillion photometric and temporal measure-ments covering 20 billion detected objects, this will produce the world’s largest database. A sample of several billion galaxies will enable maps of dark matter and several independent cross-checking probes of the nature of dark energy. The 30 terabytes of pipeline processed data obtained each night will open the time domain window on the deep optical universe for variability and motion.