Transmutation of nonlocal scale in infinite derivative field theories

Abstract

In this paper we will show an ultraviolet -infrared connection for ghost-free infinite derivative field theories where the Lagrangians are made up of exponentials of entire functions. In particular, for $N$-point amplitudes a new scale emerges in the infrared from the ultraviolet, i.e. $M_{\mathrm{eff}}\sim M_s/N^{\alpha },$ where $M_s$ is the fundamental scale beyond the Standard Model, and $\alpha >0$ depends on the specific choice of an entire function and on whether we consider zero or nonzero external momenta. We will illustrate this by first considering a scalar toy model with a cubic interaction, and subsequently a scalar toy-model inspired by ghost-free infinite derivative theories of gravity. We will briefly discuss some phenomenological implications, such as making the nonlocal region macroscopic in the infrared.

arXiv comment9 pages, 3 figures

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