Massive spin-2 scattering amplitudes in extra-dimensional theories
Open Access Publications from the University of California

## Massive spin-2 scattering amplitudes in extra-dimensional theories

• Author(s): Chivukula, R Sekhar;
• Foren, Dennis;
• Mohan, Kirtimaan A;
• Sengupta, Dipan;
• Simmons, Elizabeth H
• et al.

## Published Web Location

https://doi.org/10.1103/PhysRevD.101.075013
Abstract

In this paper we describe in detail the computation of the scattering amplitudes of massive spin-2 Kaluza-Klein excitations in a gravitational theory with a single compact extra dimension, whether flat or warped. These scattering amplitudes are characterized by intricate cancellations between different contributions: although individual contributions may grow as fast as ${\cal O}(s^5)$, the full results grow only as ${\cal O}(s)$. We demonstrate that the cancellations persist for all incoming and outgoing particle helicities and examine how truncating the computation to only include a finite number of intermediate states impacts the accuracy of the results. We also carefully assess the range of validity of the low energy effective Kaluza-Klein theory. In particular, for the warped case we demonstrate directly how an emergent low energy scale controls the size of the scattering amplitude, as conjectured by the AdS/CFT correspondence.

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