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Nonperturbative QFT in the complex momentum space

14–16 Jun 2023
Maynooth University
Europe/Dublin timezone

Maynooth QFT Workshop

Session

Wednesday Morning Session 1

14 Jun 2023, 09:00
Physics and Chemistry Theatre (PCT) (Maynooth University)

Physics and Chemistry Theatre (PCT)

Maynooth University

Conveners

Wednesday Morning Session 1: Gauge Invariance

  • Jon-Ivar Skullerud

Presentation materials

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  1. 35. Opening
    Jon-Ivar Skullerud
    14/06/2023, 09:00
  2. 2. Gauge (in)variant spectral properties of gauge-Higgs systems.
    David Dudal (KU Leuven)
    14/06/2023, 09:15
    Talk

    During this talk, we consider both Abelian and non-Abelian (fundamental) Higgs theories. We first focus on the elementary field two-point correlations functions and study the gauge dependence of the spectral functions. An equivalent but gauge invariant formulation of the spectrum is worked out, including renormalization and spectral properties. We end with a proposal to a priori introduce...

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  3. 11. Different approaches to gauge-invariance in Yang-Mills theories
    Dr Duifje van Egmond (Ecole Polytechnique, Palaiseau)
    14/06/2023, 10:00
    Talk

    Abstract

    An essential aspect of gauge theories is that all physical observable quantities have to be gauge-invariant. In practice, however, the explicit calculations of the S-matrix elements and corresponding cross sections are done by employing the non-gauge-invariant elementary fields. This is not always problematic, as sometimes gauge independence is guaranteed by symmetry identities. In...

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