Mr
Alfredo Guevara
(Perimeter)
26/09/2019, 16:10
String & Mathematical Physics
Motivated by the advent of LIGO and Virgo measurements, it has been observed that scattering amplitudes can be used to derive perturbative observables appearing in the collision of two black holes. In this talk we will cover recent progress in obtaining such quantities for the phenomenologically relevant setup of spinning black holes, focusing on radiation and the spin multipole expansion....
Dr
Gustav Mogull
(Uppsala University)
26/09/2019, 16:30
String & Mathematical Physics
Conformal supergravities are an intriguing class of theories; although they contain ghost-like states suggesting non-unitary behavior, they may have exceptionally good behavior in the ultraviolet regime. In this talk I will describe aspects of their tree-level scattering amplitudes, showing how they can be understood from double copy, Lagrangian, and string theory perspectives.
Mr
Jan Gerken
(Max Planck Institute for Gravitational Physics)
26/09/2019, 16:50
String & Mathematical Physics
When tree-level scattering amplitudes in open string theory are expanded in $\alpha'$, the coefficients are multiple zeta values (MZVs). These are mapped to a subset by the single-valued map from analytic number theory. As was proven recently, the corresponding MZVs in closed string amplitudes are just the single-valued image of the open string MZVs, therefore removing the need to calculate...
Mr
Francesco Aprile
(Milano Bicocca University)
26/09/2019, 17:10
String & Mathematical Physics
We explore the structure of supergravity on AdS5xS5 at one loop, by constructing multi-channel four-point correlators for Kaluza Klein modes on the five-sphere.
We do so by insisting on the consistency of the OPE of N=4 SYM, and using analytical bootstrap techniques. In particular, the presence of 1/N^4 contributions from protected double trace operators at the unitarity bound is a novel...
