Location: Zoom https://harvard.zoom.us/j/779283357
Time: Tuesday, April 7, 2020, 10:00 AM (Eastern US), 16:00 (Central Europe), 22:00 (China)
Title: Equivalence of Helicity and Euclidean Self-Duality for Gauge Fields
Abstract: Circularly polarized light (i.e. helicity) is a concept defined in terms of plane wave expansions of solutions to Maxwell's equations. We wish to find an analogous concept for classical and quantized Yang-Mills fields. Since the classical (hyperbolic) Yang-Mills equation is a non-linear equation, a gauge invariant plane wave expansion does not exist. We will first show, in electromagnetism, an equivalence between the usual plane wave characterization of helicity and a characterization in terms of (anti-)self duality of a gauge potential on a half space of Euclidean \(\mathbb R^4\). The transition from Minkowski space to Euclidean space is implemented by the Maxwell-Poisson equation. We will then replace the Maxwell-Poisson equation by the Yang-Mills-Poisson equation to find a decomposition of the Yang-Mills configuration space into submanifolds arguably corresponding to positive and negative helicity. This is a report on the paper [1].
References
[1] https://doi.org/10.1016/j.nuclphysb.2019.114685
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