Soft modes in quantum gravity

          @misc{ scivideos_PIRSA:20060053,
            doi = {10.48660/20060053},
            url = {https://pirsa.org/20060053},
            author = {Pate, Monica},
            keywords = {Cosmology, Particle Physics, Quantum Foundations, Quantum Gravity, Quantum Information},
            language = {en},
            title = {Soft modes in quantum gravity},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2020},
            month = {jul},
            note = {PIRSA:20060053 see, \url{https://scivideos.org/index.php/pirsa/20060053}}
          }
          

Abstract

I will review advances for gravity in asymptotically flat spacetimes arising from investigations into their structure in the infrared. The recently-discovered infinite-dimensional symmetries of the scattering problem is the central result underlying much of the progress. Key examples include symmetry-based explanations for the previously-observed universal nature of infrared phenomena including soft theorems and memory effects. Moreover, the appearance of a Virasoro symmetry among the symmetries of four-dimensional gravity has led to a proposal for holography in which the scattering amplitudes in quantum gravity are dual to correlation functions of a two-dimensional conformal theory. The other infinite-dimensional symmetry groups place additional non-trivial constraints on the dual theory.