402 citations · 3.3k across the 52 of their papers we have counts for
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Stability issues of nonlocal gravity during primordial inflation
Enis Belgacem, Giulia Cusin, Stefano Foffa +2
We study the cosmological evolution of some nonlocal gravity models, when the initial conditions are set during a phase of primordial inflation. We examine in particular three mode…
On scale-free extensions of massive (bi-)gravity
Giulia Cusin, Nima Khosravi, Johannes Noller
We discuss a scale-free model of bigravity, in which the mass parameter of the standard bigravity potential is promoted to a dynamical scalar field. This modification retains the g…
Conformal symmetry and nonlinear extensions of nonlocal gravity
Giulia Cusin, Stefano Foffa, Michele Maggiore +1
We study two nonlinear extensions of the nonlocal gravity theory. We extend this theory in two different ways suggested by conformal symmetry, either replacing $\Bo…
Non-local gravity with a Weyl-square term
Giulia Cusin, Stefano Foffa, Michele Maggiore +1
Recent work has shown that modifications of General Relativity based on the addition to the action of a non-local term , or on the addition to the equations of motio…
Non-local formulation of ghost-free bigravity theory
Giulia Cusin, Jacopo Fumagalli, Michele Maggiore
We study the ghost-free bimetric theory of Hassan and Rosen, with parameters such that a flat Minkowski solution exists for both metrics. We show that, expanding around this…