COMMENTS, REPLIES AND NOTES: A note on causality constraining higher curvature corrections to gravity
Abstract
We show that causality constrains the sign of quartic Riemann corrections to the Einstein Hilbert action. Our constraint constitutes a restriction on candidate theories of quantum gravity.
- Publication:
-
Classical and Quantum Gravity
- Pub Date:
- July 2007
- DOI:
- 10.1088/0264-9381/24/13/N02
- arXiv:
- arXiv:hep-th/0612015
- Bibcode:
- 2007CQGra..24.3521G
- Keywords:
-
- High Energy Physics - Theory;
- Astrophysics;
- General Relativity and Quantum Cosmology
- E-Print:
- 5 pages