4 papers · 1 filter
On the Complexity of Quantum Field Theory
Thomas W. Grimm, Mick van Vliet
We initiate a study of the complexity of quantum field theories (QFTs) by proposing a measure of information contained in a QFT and its observables. We show that from minimal asser…
Reductions of GKZ Systems and Applications to Cosmological Correlators
Thomas W. Grimm, Arno Hoefnagels
A powerful approach to computing Feynman integrals or cosmological correlators is to consider them as solution to systems of differential equations. Often these can be chosen to be…
Taming non-analyticities of QFT observables
Thomas W. Grimm, Giovanni Ravazzini, Mick van Vliet
Many observables in quantum field theories are involved non-analytic functions of the parameters of the theory. However, it is expected that they are not arbitrarily wild, but rath…
Structure and Complexity of Cosmological Correlators
Thomas W. Grimm, Arno Hoefnagels, Mick van Vliet
Cosmological correlators capture the spatial fluctuations imprinted during the earliest episodes of the universe. While they are generally very non-trivial functions of the kinemat…