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Towards singularity- and ghost-free theories of gravity.
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 nonlocal actions with improved UVExpand
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Inflation and dark energy from three-forms
Three-forms can give rise to viable cosmological scenarios of inflation and dark energy with potentially observable signatures distinct from standard single scalar field models. In this study, theExpand
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Coincident General Relativity
The Palatini's device is applied to generate teleparallel and symmetric teleparallel theories of gravity. From the latter is discovered an exceptional class which is consistent with a vanishingExpand
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Hybrid metric-Palatini gravity
Recently, the phenomenology of f(R) gravity has been scrutinized motivated by the possibility to account for the self-accelerated cosmic expansion without invoking dark energy sources. Besides, thisExpand
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Metric-Palatini gravity unifying local constraints and late-time cosmic acceleration
We present a novel approach to modified theories of gravity which consists of adding to the Einstein- Hilbert Lagrangian an fðRÞ term constructed ala Palatini. Using the respective dynamicallyExpand
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Cosmology and Astrophysical Constraints of Gauss-Bonnet Dark Energy
Abstract Cosmological consequences of a string-motivated dark energy scenario featuring a scalar field coupled to the Gauss–Bonnet invariant are investigated. We study the evolution of the universeExpand
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Nonlocal theories of gravity: the flat space propagator
It was recently found that there are classes of nonlocal gravity theories that are free of ghosts and singularities in their Newtonian limit [PRL, 108 (2012), 031101]. In these proceedings, aExpand
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Three-form cosmology
Abstract Cosmology of self-interacting three-forms is investigated. The minimally coupled canonical theory can naturally generate a variety of isotropic background dynamics, including scaling,Expand
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Towards a resolution of the cosmological singularity in non-local higher derivative theories of gravity
One of the greatest problems of standard cosmology is the Big Bang singularity. Previously it has been shown that non-local ghostfree higher-derivative modifications of Einstein gravity in theExpand
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DBI Galileons in the Einstein Frame: Local Gravity and Cosmology
It is shown that a disformally coupled theory in which the gravitational sector has the Einstein-Hilbert form is equivalent to a quartic Dirac-Born-Infeld Galileon Lagrangian, possessing nonlinearExpand
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