20 citations · 44 across the 8 of their papers we have counts for
8 papers
Cosmological constraints and standard sirens forecasts for non-dynamical dark energy in Horndeski gravity
Marcello Miranda, Ruchika, Ivan De Martino +2
We investigate an analytically tractable sector of the Extended Cuscuton model, a non-dynamical dark-energy realization within the framework of viable Horndeski gravity. We focus o…
How the Schwarzschild-de Sitter horizons remain in thermal equilibrium at vastly different temperatures
Marcello Miranda, Massimiliano Rinaldi, Valerio Faraoni
The Tolman-Ehrenfest criterion of thermal equilibrium for a static fluid in a static spacetime is generalized to stationary heat conduction, in the approximation in which backreact…
General analysis of Noether symmetries in Horndeski gravity
Marcello Miranda, Salvatore Capozziello, Daniele Vernieri
We explore Noether symmetries of Horndeski gravity, extending the classification of general scalar-tensor theories. Starting from the minimally coupled scalar field and the first-g…
Covariant single-field formulation of effective cosmological bounces
Marcello Miranda
This study explores the feasibility of an effective Friedmann equation in removing the classical Big Bang initial singularity and replacing it with a non-singular bounce occurring…
Effective fluid mixture of tensor-multi-scalar gravity
Marcello Miranda, Pierre-Antoine Graham, Valerio Faraoni
We apply to tensor-multi-scalar gravity the effective fluid analysis based on the representation of the gravitational scalar field as a dissipative effective fluid. This generaliza…
Fluid nature constrains Horndeski gravity
Marcello Miranda, Daniele Vernieri, Salvatore Capozziello +1
The elusive physical nature of Horndeski gravity is elucidated in a new approach depicting this class of theories as a dissipative effective fluid. Requiring the constitutive equat…
Generalized McVittie geometry in Horndeski gravity with matter
Marcello Miranda, Daniele Vernieri, Salvatore Capozziello +1
We investigate McVittie and generalized McVittie solutions for Horndeski gravity with a spatially homogeneous gravitational scalar field, which is stealth at small scales near the…
Bouncing Cosmology in Fourth-Order Gravity
Marcello Miranda, Daniele Vernieri, Salvatore Capozziello +1
The Big Bang initial singularity problem can be solved by means of bouncing solutions. In the context of extended theories of gravity, we will look for covariant effective actions…