6 papers
Gravitational wave propagation in bigravity in the late universe
David Brizuela, Marco de Cesare, Araceli Soler Oficial
We carry out a detailed analytical investigation of the propagation of gravitational waves in ghost-free bimetric gravity in a late-time de Sitter epoch. In this regime, the dynami…
A bigravity model from noncommutative geometry
Marco de Cesare, Mairi Sakellariadou, Araceli Soler Oficial
Noncommutative gravity, based on a twist-deformation of the differential geometry of spacetime and a first-order formulation of the dynamics, requires additional gravitational degr…
Black hole solutions in quantum phenomenological gravitational dynamics
Ana Alonso-Serrano, Marco de Cesare, Manuel Del Piano
We investigate black hole solutions within a phenomenological approach to quantum gravity based on spacetime thermodynamics developed by Alonso-Serrano and LiÅ¡ka. The field equati…
Multiple-scale analysis of modified gravitational-wave propagation
Marco de Cesare, Mairi Sakellariadou, Benjamin Sutton
We employ multiple-scale analysis to systematically derive analytical approximations describing the cosmological propagation of gravitational waves beyond general relativity, in a…
Dipolar perturbations of nonbidiagonal black holes in bigravity
David Brizuela, Marco de Cesare, Araceli Soler Oficial
In bimetric gravity, nonbidiagonal solutions describing a static, spherically symmetric, and asymptotically flat black hole are given by a pair of Schwarzschild geometries, one in…
A low-redshift preference for an interacting dark energy model
Yuejia Zhai, Marco de Cesare, Carsten van de Bruck +2
We explore an interacting dark sector model in trace-free Einstein gravity where dark energy has a constant equation of state, , and the energy-momentum transfer potential is…