There are plenty of cricket fans in the department. We even used to have an annual North v South match. So, in the week of England v India at Lord's in London, the so-called home of cricket, here's one of our big fans talking about one of Lord's quirks.
Described by the official English Cricket account on TikTok as "just brilliant". And you thought TikTok wasn't a prestigious journal.
14:00
Twistor-space gauge-theory amplitudes from off-shell functionals
Abstract
I will present a pair of off-shell functionals in position space, localized on the self-dual and the anti-self-dual planes which naturally give the Parke-Taylor denominator. These can therefore be used:
i) to compute scattering amplitudes of particles with different spins and helicities; and
ii) develop a Lagrangian description.
Using Witten's half-Fourier transform, I will express these functionals in twistor space and present the kernels in a closed compact form. For even multiplicities, I will show how to obtain this form geometrically which than then be “folded” to get the one-less odd-multiplicity result.
11:30
Chiral fields for massive higher spins
Abstract
I will review some recent developments in effective field theory of composite higher-spin particles, namely, Zinoviev's massive gauge symmetry and
the new chiral-field approach. The latter approach was inspired by a simple spinor-helicity structure first singled out by Arkani-Hamed, Huang and Huang, which encodes the higher-spin information of two massive particles. It turned out to be persistent in tree-level amplitudes with any number of additional identical-helicity gluons or gravitons, leading to the discovery of the chiral-field approach. I will mention the applications of massive higher-spin scattering amplitudes to classical gravitational dynamics of rotating black holes.