The Cosmological Constant Problem and Nonlocal Quantum Gravity

TL;DR

This paper introduces a nonlocal quantum gravity model that is finite and unitary, suppresses vacuum fluctuations at low energies, and proposes an experiment to test its implications for the equivalence principle.

Contribution

It presents a novel nonlocal quantum gravity theory with specific suppression scales and suggests an experimental test for vacuum energy coupling effects.

Findings

Finite and unitary quantum gravity to all orders.

Suppression of vacuum fluctuations below 2.4 x 10^{-3} eV.

Proposed satellite experiment to test equivalence principle violations.

Abstract

A nonlocal quantum gravity theory is presented which is finite and unitary to all orders of perturbation theory. Vertex form factors in Feynman diagrams involving gravitons suppress graviton and matter vacuum fluctuation loops by introducing a low-energy gravitational scale, Lambda_{Gvac} < 2.4 X 10^{-3} eV. Gravitons coupled to non-vacuum matter loops and matter tree graphs are controlled by a vertex form factor with the energy scale, Lambda_{GM} < 1-10 TeV. A satellite Eotvos experiment is proposed to test a violation of the equivalence principle for coupling of gravitons to pure vacuum energy compared to matter.