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Towards singularity and ghost free theories of gravity

Research output: Contribution to journalJournal article


Article number031101
<mark>Journal publication date</mark>19/01/2012
<mark>Journal</mark>Physical Review Letters
Issue number3
Number of pages4
<mark>Original language</mark>English


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 non-local actions with improved UV behavior, which nevertheless recover Einstein's general relativity in the IR.

Bibliographic note

4 pages; redundancies in action eliminated; references added and a few minor typos corrected © 2012 American Physical Society