Events at Physics

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Events on Friday, March 25th, 2011

Theory/Phenomenology Seminar
The Particle Physics and Cosmology of SU(4) Heterotic Vacua---the B-L MSSM
Time: 2:30 pm - 3:30 pm
Place: 5280 Chamberlin Hall
Speaker: Burt Ovrut, University of Pennsylvania
Host: Sogee Spinner
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Physics Department Colloquium
Cosmology without Cosmic Variance
Time: 4:00 pm
Place: 2241 Chamberlin Hall (coffee at 3:30 pm)
Speaker: Gary Bernstein, University of Pennsylvania
Abstract: The acceleration of the Hubble expansion may be due to the failure of General Relativity to explain gravity on cosmological scales. This can be tested by measuring the gravitational growth of the largest structures, 100 Mpc or larger. The standard methods for such experiments involve measuring power spectra at different epochs, and are therefore limited by fluctuations from the finite number of large-scale modes in the observable Universe, a.k.a. "cosmic variance." I will describe how galaxy redshift and weak gravitational lensing surveys can be combined in a new way to measure gravitational growth to theoretically unlimited precision with a finite survey of the sky.
Host: Timbie
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