Nonperturbative QFT in the complex momentum space

Session

Wednesday Afternoon Session

14 Jun 2023, 14:00

Physics and Chemistry Theatre (PCT) (Maynooth University)

6. Are the Gluon Complex Poles Real?

Fabio Siringo

14/06/2023, 14:00

Talk

The existence of genuine complex conjugated poles in the gluon propagator is discussed together with the problems that the complex poles would raise.

In the first part, some arguments in favour of their existence are presented. Their appearance in different approaches is reviewed and some features of the complex poles are related to confinement, string tension and condensates.

In the...

9. Non-perturbative characteristics of spectral functions at finite temperature

Peter Lowdon

14/06/2023, 14:45

Talk

For QFTs at finite temperature spectral functions describe how particle systems behave in the presence of a thermal medium. Here we report on recent progress regarding the non-perturbative constraints imposed by causality on these objects, and discuss how this information can be used to extract spectral properties from Euclidean data.