Speaker
Felix Halbwedl
(University of Graz)
Description
The quark propagator is one of the basic building blocks
required to compute physical properties of hadronic bound
states via Bethe-Salpeter equations. While it is a routine task nowadays
to calculate it nonperturbatively for a wide range of real spacelike
momenta via the Quark Dyson-Schwinger Equation (DSE), its direct computation
for generic complex momenta remains challenging and depends on
the Vertex Ansatz needed as an input for the DSE.
The aim of this work is to compare and complement commonly
employed extrapolation methods with more recently used
complex domain methods like the Cauchy or contour deformation
ones to examine the quark propagators analytic structure for different Vertex
Ansätze (Rainbow Ladder, Ball-Chiu).
Author
Felix Halbwedl
(University of Graz)