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Cosmological dynamics and dark energy from non-local infrared modifications of gravity
Stefano Foffa, Michele Maggiore, Ermis Mitsou
We perform a detailed study of the cosmological dynamics of a recently proposed infrared modification of the Einstein equations, based on the introduction of a non-local term const…
Apparent ghosts and spurious degrees of freedom in non-local theories
Stefano Foffa, Michele Maggiore, Ermis Mitsou
Recent work has shown that non-local modifications of the Einstein equations can have interesting cosmological consequences and can provide a dynamical origin for dark energy, cons…
Phantom dark energy from non-local infrared modifications of General Relativity
Michele Maggiore
We discuss the cosmological consequences of a model based on a non-local infrared modification of Einstein equations. We find that the model generates a dynamical dark energy that…
A non-local theory of massive gravity
Maud Jaccard, Michele Maggiore, Ermis Mitsou
We construct a fully covariant theory of massive gravity which does not require the introduction of an external reference metric, and overcomes the usual problems of massive gravit…