Title: The structure of IR divergences in celestial gluon amplitudes
Speaker: Hernán González
Affiliation: Adolfo Ibanez University, Chile
Time: 19:00-20:00, Tuesday, December 7th, 2021 (UTC+8, Beijing Time)
Inviter: Ryo Suzuki
Abstract
Celestial amplitudes reveal two-dimensional conformal properties of scattering amplitudes for massless particles. In this talk we describe the factorization properties of infrared regulated gluon amplitudes in terms of celestial data. We show that the full divergent contribution becomes a scalar correlator of the product of celestial primaries. The effect of these operators on the hard amplitude is a shift in the scaling dimensions of each asymptotic state by an infinite amount, proportional to the cusp anomalous dimension. We finalize this talk by commenting on the properties of the celestial CFT controlling infrared and non-abelian degrees of freedom.
About the Speaker
Hernán González is Assistant Professor in Adolfo Ibáñez University. He received his Ph.D. degeree in Physics in Pontificia Universidad Católica de Chile in 2013. He carried out post-doctoral studies at the Free University of Brussels, Belgium and at the Technological University of Vienna, Austria. He is interested in the application of General Relativity to the study of the structure of spacetime in situations where the gravitational field is very intense.
Currently, his research is focused on the construction of extensions of the AdS / CFT correspondence to asymptotically flat spaces, which are a good approximation of the real geometry of the universe. Likewise, they have been shown to describe the nature of black holes in the vicinity of their event horizons.
The seminar will be broadcasted online by Zoom.
Interested people are free to join, without registration in advance.
The Zoom info is
URL: https://us02web.zoom.us/j/3854420225?pwd=SXY4eWJKOTBFZWJDaE16aXpTamY1QT09
Meeting ID: 385 442 0225
Passcode: yauc
