03.02.2023, 13:30 (unusal time!)
– Zoom Meeting
Arbeitsgruppenseminar Analysis
The mathematics of causal set theory
Sumati Surya (Raman Research Institute, Bangalore, India)
Michal Wrochna (Grenoble)
In Quantum Field Theory on curved spacetimes, the problem of constructing Wick powers of fields amounts to dealing with a priori ill-defined trace densities of certain Fourier Integral Operators. Instead of doing so directly, I will explain how this can be reduced to the case of elliptic (but in general non self-adjoint) pseudo-differential operators. This enables the use of renormalization methods that have quite different features from the broadly used Hadamard parametrix. (based on joint works with Christian Gérard)