Unitarity in Infinite Derivative Theories

Abstract

In this paper, we consider an infinite derivative scalar field action with infinite derivative kinetic and interaction terms. We establish that the theory is unitary if the correlation functions are formulated in Euclidean space and then analytically continued in their external momenta to Minkowski space.

8 pages

References in corpus (4)

• The causal set approach to quantum gravity
• Towards UV Finiteness of Infinite Derivative Theories of Gravity and Field Theories
• Scale of non-locality for a system of $n$ particles
• Slavnov Identities for Infinite Derivative Theory of Gravity