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Alive and well: mimetic gravity and a higher-order extension in light of GW170817
Alessandro Casalino, Massimiliano Rinaldi, Lorenzo Sebastiani +1
The near-simultaneous multi-messenger detection of the gravitational wave (GW) event GW170817 and its optical counterpart, the short -ray burst GRB170817A, implies that deviatio…
On a WKB formula for echoes
L. Sebastiani, L. Vanzo, S. Zerbini
We present an unified approach for the study of idealized gravitational compact objects like wormholes and horizonless stars, here simulated by the presence of boundary conditions…
Static Spherically Symmetric solutions in a subclass of Horndeski theories of gravity
Lorenzo Sebastiani
In this paper, we will consider a subclass of models of Horndeski theories of gravity and we will check for several Static Spherically Symmetric solutions. We will find a model whi…
Mimicking dark matter and dark energy in a mimetic model compatible with GW170817
Alessandro Casalino, Massimiliano Rinaldi, Lorenzo Sebastiani +1
The recent observation of the the gravitational wave event GW170817 and of its electromagnetic counterpart GRB170817A, from a binary neutron star merger, has established that the s…
A special class of solutions in -gravity
Marco Calzà, Massimiliano Rinaldi, Lorenzo Sebastiani
We consider a special class of vacuum -modified gravity models. The form of their Lagrangian is such that the field equations are trivially satisfied when the Ricci scalar is…