Towards Singularity- and Ghost-Free Theories of Gravity
Abstract
We present the most general covariant ghost-free gravitational action in a Minkowski vacuum. Apart from the much studied f(R) models, this includes a large class of nonlocal actions with improved UV behavior, which nevertheless recover Einstein’s general relativity in the IR.
- Publication:
-
Physical Review Letters
- Pub Date:
- January 2012
- DOI:
- 10.1103/PhysRevLett.108.031101
- arXiv:
- arXiv:1110.5249
- Bibcode:
- 2012PhRvL.108c1101B
- Keywords:
-
- 04.50.Kd;
- 98.80.Cq;
- Modified theories of gravity;
- Particle-theory and field-theory models of the early Universe;
- General Relativity and Quantum Cosmology;
- Astrophysics - Cosmology and Extragalactic Astrophysics;
- High Energy Physics - Phenomenology;
- High Energy Physics - Theory
- E-Print:
- 4 pages