Nonperturbative QFT in the complex momentum space

Session

Wednesday Morning Session 2

14 Jun 2023, 11:15

Physics and Chemistry Theatre (PCT) (Maynooth University)

3. Reconstruction and interpretation of propagators with complex singularities

Yui Hayashi (YITP, Kyoto University)

14/06/2023, 11:15

Talk

Several theoretical models and recent numerical studies propose the existence of complex singularities in propagators of confined particles, specifically the Landau-gauge gluon propagator. Such singularities are beyond the conventional framework of quantum field theory, necessitating a detailed analysis of the reconstruction from Euclidean to Minkowski propagators. This talk will present our...

5. On the analytic structure of three-point functions from contour deformations

Markus Huber

14/06/2023, 12:00

Talk

Contour deformations are a useful tool to perform calculations for complex momenta in Euclidean metric. An application is the calculation of elementary correlations of quarks and gluons. In the case of propagators, it is already used and applied to different cases. However, due to the more complicated kinematics, the situation is different for vertices for which this technique is hardly...