# String-localized quantum field theory

July 18, 2023

String-localized quantum field theory (SQFT) is a relatively recent (mainly perturbative at
time of this writing) approach to interacting quantum field theory, whose main
intention is to “liberate” the interactions of the Standard Model from unphysical degrees of
freedom, that are suggested by gauge invariance of classical Lagrangians.
An overview is given of its origins and motivations, its basic ideas and tools, and its achievements up-to-date.

Commissioned by the Encyclopedia of Mathematical Physics, M. Bojowald and R.J. Szabo (eds.). To be published by Elsevier.

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Keywords:

String-localized quantum fields, perturbative QFT, causal perturbation theory, Standard Model of particles