1110.5249 (Tirthabir Biswas et al.)

Towards singularity and ghost free theories of gravity    [PDF]

Tirthabir Biswas, Erik Gerwick, Tomi Koivisto, Anupam Mazumdar

We present the most general 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.

View original: http://arxiv.org/abs/1110.5249