Dr
Teresa Bautista
(Max Planck Institute for Gravitational Physics)
26/09/2019, 14:00
String & Mathematical Physics
The Euclidean path integral of quantum gravity requires a proper definition because the kinetic term for the conformal factor of the metric comes with an additional minus sign. We propose a definition of two-dimensional quantum gravity with a cosmological constant based on the conformal bootstrap results of timelike Liouville theory coupled to matter. For the spectrum, we prove a no-ghost...
Marc Schiffer
(Heidelberg University)
26/09/2019, 14:20
String & Mathematical Physics
After a short introduction to asymptotically safe quantum gravity, I explore the question why our universe is four dimensional from an asymptotically safe vantage point.
I present indications that asymptotically safe quantum fluctuations of gravity could only solve the $U(1)$ Landau-pole problem in the Standard Model in four dimensions. This could single out the observed dimensionality of the...
Dr
Edoardo Vescovi
(Imperial College London)
26/09/2019, 14:40
String & Mathematical Physics
In this talk, based on [1906.07733] with Y. Jiang and S. Komatsu, we derive the first non-perturbative result for the structure constants of two determinant operators and a non-BPS single-trace operator of finite length in planar $\mathcal{N}=4$ SYM. First, we introduce a new method based on large-N collective fields, which efficiently computes correlators of such non-single-trace operators in...
Dr
Florian Loebbert
(Humboldt University Berlin)
26/09/2019, 15:00
String & Mathematical Physics
We report on progress in exploring the constraining power of the conformal Yangian symmetry that was recently found to be a feature of fishnet Feynman integrals. In particular, we explicitly investigate the four-point box and the six-point double-box integrals.
Dr
Raul Pereira
(Trinity College Dublin)
26/09/2019, 15:20
String & Mathematical Physics
In this talk I consider five-point functions of N=4 SYM, which at strong coupling become AdS amplitudes in type IIB supergravity. I will show how to exploit symmetries and self-consistency conditions to bootstrap these amplitudes, which are naturally written in Mellin space. Finally, I will highlight the new data obtained and comment on generalizations of this work.
