Collider Signals of Gravitational Fixed Points

Abstract

Recent studies have shown that the poor perturbative behavior of General Relativity in the ultraviolet regime may be ameliorated by the existence of a non-Gaussian fixed point which renders the theory asymptotically safe and possibly non-perturbatively renormalizable. This results in a running of the (effective) gravitational coupling such that gravity becomes weaker at high energies. We parameterize this effective coupling with a form factor and study its consequences at the LHC and ILC in models with large extra dimensions or warped extra dimensions. We find significant effects in the processes of Kaluza-Klein (KK) graviton exchange or resonant KK graviton production in both the Drell-Yan reaction as well as in $e^{+}{e}^{-}\to f\bar{f}$. On the otherhand, processes leading to KK graviton emission show qualitatively less sensitivity to the presence of a form factor. In addition, we examine tree-level perturbative unitarity in $2\to 2$ gravity-mediated scattering and find that this form factor produces a far better behaved amplitude at large center of mass energies.

33 pages

References in corpus (6)

• Tests of the Gravitational Inverse-Square Law below the Dark-Energy Length Scale
• Particle Physics Implications of a Recent Test of the Gravitational Inverse Square Law
• Non-Local Modification of Gravity and the Cosmological Constant Problem
• Newtonian limit of Extended Theories of Gravity
• Quantum Gravity Through Non-Perturbative Renormalization Group and Improved Black Hole
• A Stringy Composite Graviton and the Cosmological Constant Problem

Cited by in corpus (4)

• On the renormalization group flow of f(R)-gravity
• Signatures of gravitational fixed points at the LHC
• Fixed Points of Quantum Gravity and the Renormalisation Group
• Identification of the Origin of Monojet Signatures at the LHC