Unitarization and Causalization of Non-local quantum field theories by Classicalization

Abstract

We suggest that classicalization can cure non-local quantum field theories from acausal divergences in scattering amplitudes, restoring unitarity and causality. In particular, in "trans-non-local" limit, the formation of non-perturbative classical configurations, called {\it classicalons}, in scatterings like $\varphi \varphi \to \varphi \varphi$, can avoid typical acausal divergences.

More references on non-local QFT and quantum gravity added, few typos corrected. The content is the same

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Cited by in corpus (12)

• Limiting First Order Phase Transitions in Dark Gauge Sectors from Gravitational Waves experiments
• Glimpses of black hole formation/evaporation in highly inelastic, ultra-planckian string collisions
• Unitarity and microscopic acausality in a nonlocal theory
• Exotic see-saw mechanism for neutrinos and leptogenesis in a Pati-Salam model
• Strong Coupling and Classicalization
• Direct generation of a Majorana mass for the Neutron from Exotic Instantons
• UV self-completion of a theory of Superfluid Dark Matter
• More about Neutron Majorana mass from Exotic Instantons: an alternative mechanism in Low-Scale String theory
• Towards UV Finiteness of Infinite Derivative Theories of Gravity and Field Theories
• Hidden Non-Locality and Self-Superrenormalization of Quantum Gravity
• Testing B-violating signatures from Exotic Instantons in future colliders
• Unitarity in Infinite Derivative Theories