PIRSA:16110020

Weinberg Soft Theorems from Weinberg Adiabatic Modes

APA

Mirbabayi, M. (2016). Weinberg Soft Theorems from Weinberg Adiabatic Modes. Perimeter Institute. https://pirsa.org/16110020

MLA

Mirbabayi, Mehrdad. Weinberg Soft Theorems from Weinberg Adiabatic Modes. Perimeter Institute, Nov. 08, 2016, https://pirsa.org/16110020

BibTex

          @misc{ pirsa_16110020,
            doi = {},
            url = {https://pirsa.org/16110020},
            author = {Mirbabayi, Mehrdad},
            keywords = {Particle Physics},
            language = {en},
            title = {Weinberg Soft Theorems from Weinberg Adiabatic Modes},
            publisher = {Perimeter Institute},
            year = {2016},
            month = {nov},
            note = {PIRSA:16110020 see, \url{https://pirsa.org}}
          }
          

Abstract

Soft theorems for the scattering of low energy photons and gravitons and cosmological consistency conditions on the squeezed-limit correlation functions are both understood to be consequences of invariance under large gauge transformations. I apply the same method used in cosmology -- based on the identification of an infinite set of "adiabatic modes" and the corresponding conserved currents -- to derive flat space soft theorems for electrodynamics and gravity. I discuss how the recent derivations based on the asymptotic symmetry groups (BMS) can be continued to a finite size sphere surrounding the scattering event. Finally, I comment on Hawking-Perry-Strominger proposal of "soft hair on black holes".