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High Energy Physics - Theory

arXiv:1605.02030 (hep-th)
[Submitted on 6 May 2016 (v1), last revised 7 Feb 2017 (this version, v3)]

Title:Unitarity and microscopic acausality in a nonlocal theory

Authors:Christopher D. Carone
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Abstract:We consider unitarity and causality in a higher-derivative theory of infinite order, where propagators fall off more quickly in the ultraviolet due to the presence of a transcendental entire function of the momentum. Like Lee-Wick theories, these field theories might provide new avenues for addressing the hierarchy problem; unlike Lee-Wick theories, tree-level propagators do not have additional poles corresponding to unobserved particles with unusual properties. We consider microscopic acausality in these nonlocal theories. The acausal ordering of production and decay vertices for ordinary resonant particles may provide a phenomenologically distinct signature for these models.
Comments: 26 pages LaTeX, 4 eps figures (latest version: discussion added)
Subjects: High Energy Physics - Theory (hep-th); High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:1605.02030 [hep-th]
  (or arXiv:1605.02030v3 [hep-th] for this version)
  https://doi.org/10.48550/arXiv.1605.02030
Journal reference: Phys. Rev. D 95, 045009 (2017)
Related DOI: https://doi.org/10.1103/PhysRevD.95.045009

Submission history

From: Christopher D. Carone [view email]
[v1] Fri, 6 May 2016 18:44:25 UTC (120 KB)
[v2] Fri, 13 May 2016 21:27:20 UTC (120 KB)
[v3] Tue, 7 Feb 2017 16:47:34 UTC (341 KB)
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