QFT with stubs
Aug 9, 202126 pages
Published in:
- JHEP 06 (2022) 120
- Published: Jun 21, 2022
e-Print:
- 2108.04312 [hep-th]
Report number:
- LMU-ASC 29/21,
- HU-EP-21/24
View in:
Citations per year
Abstract: (Springer)
The BV-Laplacian ∆ in quantum field theory is singular, by construction, but can be regularized by deforming the classical BV-action. Taking inspiration from string theory we describe a non-local deformation of the latter by adding stubs to the interaction vertices while keeping classical BV-invariance manifest. This is achieved using a version of homotopy transfer resulting in a non-polynomial action for which the quantum master equation is now well defined and will be satisfied by adding additional vertices at loop level. The latter can be defined with the help of standard regularization schemes and is independent of the definition of ∆. In particular, the determination of anomalies reduces to the standard text-book calculation. Finally, we describe how the deformed (quantum) action can be obtained as a canonical transformation. As an example, we illustrate this procedure for quantum electrodynamics.Note:
- 26 pages, 1 figure
- Anomalies in Field and String Theories
- BRST Quantization
- Gauge Symmetry
- transformation: canonical
- regularization
- deformation
- string model
- quantum electrodynamics
- nonlocal
- homotopy
References(17)
Figures(1)
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