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Statistics on Lefschetz thimbles: Bell/Leggett-Garg inequalities and the classical-statistical approximation

Millington, Peter; Mou, Zong-Gang; Saffin, Paul M.; Tranberg, Anders

Statistics on Lefschetz thimbles: Bell/Leggett-Garg inequalities and the classical-statistical approximation Thumbnail


Authors

Peter Millington

Zong-Gang Mou

PAUL SAFFIN PAUL.SAFFIN@NOTTINGHAM.AC.UK
Professor of Physics

Anders Tranberg



Abstract

Inspired by Lefschetz thimble theory, we treat Quantum Field Theory as a statistical theory with a complex Probability Distribution Function (PDF). Such complex-valued PDFs permit the violation of Bell-type inequalities, which cannot be violated by a real-valued, non-negative PDF. In this paper, we consider the Classical-Statistical approximation in the context of Bell-type inequalities, viz. the familiar (spatial) Bell inequalities and the temporal Leggett-Garg inequalities. We show that the Classical-Statistical approximation does not violate temporal Bell-type inequalities, even though it is in some sense exact for a free theory, whereas the full quantum theory does. We explain the origin of this discrepancy, and point out the key difference between the spatial and temporal Bell-type inequalities. We comment on the import of this work for applications of the Classical-Statistical approximation.

Citation

Millington, P., Mou, Z., Saffin, P. M., & Tranberg, A. (2021). Statistics on Lefschetz thimbles: Bell/Leggett-Garg inequalities and the classical-statistical approximation. Journal of High Energy Physics, 2021(3), Article 77. https://doi.org/10.1007/jhep03%282021%29077

Journal Article Type Article
Acceptance Date Jan 22, 2021
Online Publication Date Mar 8, 2021
Publication Date 2021-03
Deposit Date Mar 9, 2021
Publicly Available Date Mar 28, 2024
Journal Journal of High Energy Physics
Electronic ISSN 1029-8479
Publisher Springer Verlag
Peer Reviewed Peer Reviewed
Volume 2021
Issue 3
Article Number 77
DOI https://doi.org/10.1007/jhep03%282021%29077
Keywords Nuclear and High Energy Physics
Public URL https://nottingham-repository.worktribe.com/output/5382297
Publisher URL https://link.springer.com/article/10.1007/JHEP03(2021)077

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