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Even if the fundamental action of gravity is local, the corresponding quantum effective action, that includes the effect of quantum fluctuations, is a nonlocal object. These nonlocalities are well… (More)

Studies of dark energy at advanced gravitational-wave (GW) interferometers normally focus on the dark energy equation of state $w_{\rm DE}(z)$. However, modified gravity theories that predict a… (More)

We present a comprehensive and updated comparison with cosmological observations of two non-local modifications of gravity previously introduced by our group, the so called RR and RT models. We… (More)

We study the cosmological consequences of a recently proposed nonlocal modification of general relativity, obtained by adding a term $m^2R\,\Box^{-2}R$ to the Einstein-Hilbert action. The model has… (More)

We study the cosmological predictions of two recently proposed non-local modifications of General Relativity. Both models have the same number of parameters as ?CDM, with a mass parameter m replacing… (More)

- Yves Dirian, Ermis Mitsou
- 2014

We analyse the classical stability of the model proposed by Maggiore and Mancarella, where gravity is modified by a term ~ m2 R -2 R to produce the late-time acceleration of the expansion of the… (More)

In modified gravity theories, the luminosity distance for gravitational waves (GWs) is in general different from that for electromagnetic signals. This opens the possibility of model-independent… (More)

- Emilio Bellini, Alexandre Barreira, +24 authors Filippo Vernizzi
- 2018

We compare Einstein-Boltzmann solvers that include modifications to general relativity and find that, for
a wide range of models and parameters, they agree to a high level of precision. We look at… (More)

- Enis Belgacem, Gianluca Calcagni, +18 authors Mairi Sakellariadou
- 2019

Modifications of General Relativity leave their imprint both on the cosmic expansion history through a non-trivial dark energy equation of state, and on the evolution of cosmological perturbations in… (More)

We discuss a modified gravity model which fits cosmological observations at a level statistically indistinguishable from $\Lambda$CDM and at the same time predicts very large deviations from General… (More)