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gr-qc2011★ 731 cited
Towards singularity and ghost free theories of gravity
Tirthabir Biswas, Erik Gerwick, Tomi Koivisto +1
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 actio…
astro-ph.CO2011★ 7 cited
Could our Universe have begun with Negative Lambda?
Tirthabir Biswas, Tomi Koivisto, Anupam Mazumdar
In this paper we present an informal description of the Cyclic Inflation scenario which allows our universe to "start" with a negative potential energy, inflate, and then gracefull…