Publication details for Professor Steven AbelAbel, Steven, Buoninfante, Luca & Mazumdar, Anupam (2020). Nonlocal gravity with worldline inversion symmetry. Journal of High Energy Physics 2020(1): 3.
- Publication type: Journal Article
- ISSN/ISBN: 1029-8479 (electronic)
- DOI: 10.1007/JHEP01(2020)003
- Further publication details on publisher web site
- Durham Research Online (DRO) - may include full text
Author(s) from Durham
We construct a quadratic curvature theory of gravity whose graviton propagator around the Minkowski background respects wordline inversion symmetry, the particle approximation to modular invariance in string theory. This symmetry automatically yields a corresponding gravitational theory that is nonlocal, with the action containing infinite order differential operators. As a consequence, despite being a higher order derivative theory, it is ghost-free and has no degrees of freedom besides the massless spin-2 graviton of Einstein’s general relativity. By working in the linearised regime we show that the point-like singularities that afflict the (local) Einstein’s theory are smeared out.