Non-Perturbative QFT in Euclidean and Minkowski

Session

Posters

11 Sept 2019, 16:30

E10.B

26. Coordinate-Space time order perturbation theory

Alexandre Salas-Bernárdez

11/09/2019, 16:30

Posters

13. Extracting topological information from momentum space propagators

Pablo Pais

11/09/2019, 16:40

Posters

A new topological invariant quantity, sensitive to the analytic structure of both fermionic and bosonic propagators, is proposed. A generalization compatible with the presence of complex poles is introduced and applied to the classification of propagators typically emerging from non-perturbative considerations. We present partial evidence that this topological number can be used to detect...

20. Lattice computation of the Landau gauge quark propagator at finite temperature

Paulo Silva (Center for Physics, University of Coimbra)

11/09/2019, 16:40

Posters

We report on the computation of the quark propagator at finite temperature in the Landau gauge using quenched gauge configurations. The propagator form factors are computed for various temperatures, above and below the gluon deconfinement temperature $T_c$, and for all the Matsubara frequencies. Significant differences are found between the form factores below and above $T_c$, which suggest a...

24. Nontrivial analytic structure of fermion propagators: Truncation Artefact or Confinement Signal?

Pieter Maris (Iowa State University)

11/09/2019, 16:40

Posters

Dyson-Schwinger studies of the fermion propagator are typically performed in Euclidean metric, providing information on the nonperturbative behavior of the fermion propagator at spacelike momenta. It has been known for more than 40 years that an analytic continuation to the entire complex momentum plane can, and often does, reveal 'mass-like' singularities at complex-conjugate momenta, even...

19. Pion calculation observables with the Minkowski space pion model

Dr João Pacheco de Melo ([1]~Laboratório de Física Teórica e Computacional - LFTC - Universidade Cruzeiro do Sul/Universidade Cidade de São Paulo,SP., Brazil)

11/09/2019, 16:40

Posters

The pion structure in Minkowski space is described in terms of an analytic model of the Bethe–Salpeter amplitude combined with Euclidean Lattice QCD results.
The model is physically motivated to take into account the running quark mass, which is fitted to Lattice QCD data. In the present work, we extend the an previus work, with the present model utilized to calculated the pion...

23. Solutions of DSE in Minkowski space via Nakanishi Integral Representation

Wayne de Paula (Instituto Tecnologico de Aeronautica)

11/09/2019, 16:40

Posters

An important tool to deal with the formulation in Minkowski space is the Integral
Representation (IR) proposed by Nakanishi.
In this work, we use the IR to obtain a solution of the Dyson-Schwinger equation directly in Minkowski space, and compare with a solution in a rotated axis from the Euclidean axis, what we call ``Un-Wick rotation''. To this end we must find the relation between the...

25. From propagators to resonances in QCD

Dr Markus Huber (Giessen University), Richard Williams (University of Giessen)

11/09/2019, 16:50

Posters

We show results for propagators and vertices in Yang-Mills theory and QCD obtained from the 3PI effective action. Their use in calculating bound-states and resonances requires access to complex momenta, necessitating special care. We perform appropriate deformations of the integration contour to avoid cuts and poles and present corresponding results for bound states as well as first results...