Theory Seminar

Theory seminars take place Monday afternoons at 2:10 PM in the Pupin Hall Theory Center on the 8th floor.

Information on the High Energy Theory group can be found here.

Bart Horn - Manhattan College

Monday, February 18, 2019 - 2:10pm


"Double soft gravitons and the extended BMS charge algebra"

We discuss how scattering amplitudes with multiple soft gravitons realize the BMS charge algebra on the null boundary, including a symmetry-breaking extension term once the Virasoro algebras of local superrotations are included.  We discuss the robustness of these relations under quantum corrections, and we discuss the implications of this structure for the existence of a 2D dual CFT description for 4

Kin-Wang Ng - Academia Sinica, Taiwan

Monday, March 4, 2019 - 2:10pm


"Inflation, primordial black holes, and gravitational waves"

We discuss the production of primordial black holes and associated gravitational waves in inflation models. These primordial black holes may constitute the dark matter and the associated gravitational waves may be detectable by pulsar timing arrays and gravity-wave interferometry experiments.

About the speaker

Levon Pogosian - Simon Fraser University, Canada

Monday, March 18, 2019 - 2:10pm


Title & abstract TBA

About the speaker

I am a cosmologist, which means I use the universe as a laboratory for testing the laws of Nature. My interests include dark energy and modified gravity, cosmic microwave background (CMB), structure formation, cosmic magnetic fields, cosmic strings and other topological defects and their implications for particle physics and cosmology.

More details on Levon's research can be found here.


Bharat Ratra - Kansas State University

Monday, March 25, 2019 - 2:10pm


"Cosmological Seed Magnetic Field from Inflation"

A cosmological magnetic field of nG strength on Mpc length scales could be the seed magnetic field needed to explain observed few microG large-scale galactic magnetic fields. I first briefly review the observational and theoretical motivations for such a seed field, two galactic magnetic field amplification models, and some non-inflationary seed field generation scenarios. I then discuss an inflation magnetic field generation model.

Tom Hartman - Cornell

Monday, April 29, 2019 - 2:10pm


Title& abstract TBA

About the speaker

Tom's research is on quantum gravity and quantum field theory, using techniques from string theory, general relativity, condensed matter, and quantum information. 

Emergent Spacetime


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