Department Calendar

Monday, September 25, 2017

Time Items
All day
 
2pm
"Topological sectors, supersymmetric localization, and holography"

"Topological sectors, supersymmetric localization, and holography"

Date: 
Mon, 09/25/2017 - 2:10pm
Location: 
Pupin Hall Theory Center, 8th Floor

Silviu Pufu

Princeton University

"Topological sectors, supersymmetric localization, and holography"

Correlation functions are interesting observables in quantum field theory that are very hard to compute away from perturbative expansions.  I will describe recent work where, in supersymmetric theories, exact computations of such observables are possible using the technique of supersymmetric localization.  I will focus on three-dimensional superconformal field theories (SCFTs) with {\cal N} = 4 supersymmetry, where the operators I study form a one-dimensional topological sector.  In the special case of 3d SCFTs with AdS_4 holographic duals, I will describe the bulk duals of the corresponding topological sectors.  This yields instances of a 2d/1d holographic duality where the bulk theories are weakly coupled and the boundary theories are exactly solvable.

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09/25/2017 - 2:10pm
 
4pm
"The Twisted Universe: the cosmic quest to reveal which end is up"

"The Twisted Universe: the cosmic quest to reveal which end is up"

Date: 
Mon, 09/25/2017 - 4:15pm
Location: 
428 Pupin Hall

Brian Keating

University of California San Diego

"The Twisted Universe: the cosmic quest to reveal which end is up"

The cosmic microwave background (CMB) has spectacularly advanced our understanding of the origin, composition, and evolution of our universe. Yet there is still much to glean from this, the oldest light in the universe. Powerful telescopes are plying the skies in a quest to discover new physics. This talk concentrates on measurements by cutting-edge CMB telescopes which offer a glimpse into an exhilarating, and largely unexplored branch of astrophysics: the search for unique signatures in the polarization of the CMB. In this talk I will explain how the CMB can constrain fundamental physics phenomena such as primordial magnetism and elementary particle masses.  Tantalizing bounds on parity-violating effects such as cosmic birefringence — the rotation of the polarization plane of cosmic photons — will be discussed. I will describe early attempts to measure cosmic parity violation using distant galaxies as well as state-of the-art CMB measurements made in Chile's Atacama Desert by our POLARBEAR and Simons Array experiments.

About the speaker

Professor Brian Keating obtained his B.S. from Case Western Reserve University in 1993, and his M.S. (1995) and Ph.D. (2000) from Brown University.  Since 2004 Brian has been with the University of California, San Diego at UC San Diego's Center for Astrophysics & Space Sciences.

At UCSD Cosmology his group's current projects include:  BICEP1, BICEP2, CIBER, POLARBEAR, and Simons Observatory

More details can be found here.

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09/25/2017 - 4:15pm
 
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