Gravity, Twistors and Amplitudes: Recent Episodes
Cambridge University
Over the last ten years, tremendous progress has been made in understanding scattering amplitudes in Yang-Mills and gravity theories. On the technical side, new explicit formulae for general n-particle scattering amplitudes have been discovered that exhibit remarkable new mathematical structures. On the conceptual side, a new proof of GR and Yang-Mills uniqueness has been obtained, in which the basic cubic interaction is fixed (on-shell) from simple scaling considerations, and all other amplitudes are built from the basic cubic ones by the use of recursion relations. Thus, from this perspective, gravity and Yang-Mills theories are the simplest nontrivial quantum field theories. Furthermore, there are remarkable relations between gravity and the `square' of Yang-Mills arising from colour-kinematic duality. Unfortunately, at present we only see manifestations of this simplicity in the perturbative structure of the field equations. An open problem is to understand these structures nonperturbatively, arising from hidden structures also in fully non-linear gravity and Yang-Mills theories.
Schlotterer, O (Max-Planck-Institut fur Gravitationphysik) Friday 1st July 2016 - 09:00 to 10:00
Monteiro, R (CERN - European Organisation for Nuclear Research) Thursday 30th June 2016 - 10:00 to 11:00
Goddard, P (Institute for Advanced Study, Princeton) Thursday 30th June 2016 - 14:30 to 15:30
Bjerrum-Bohr, E (Københavns Universitet (University of Copenhagen)) Thursday 30th June 2016 - 09:00 to 10:00
Herfray, Y (University of Nottingham, ENS - Lyon) Tuesday 28th June 2016 - 16:00 to 17:00
Salamon, S (King's College London, Politecnico di Torino) Tuesday 28th June 2016 - 14:30 to 15:30
Acharya, B (King's College London, Abdus Salam International Centre for Theoretical Physics) Wednesday 29th June 2016 - 09:00 to 10:00
Walpuski, T (Massachusetts Institute of Technology) Tuesday 28th June 2016 - 11:30 to 12:30