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Towards singularity and ghost free theories of gravity

Research output: Contribution to journalJournal article


Article number031101
Journal publication date19/01/2012
JournalPhysical Review Letters
Number of pages4
Original languageEnglish


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