67 citations · 97 across the 6 of their papers we have counts for
13 papers
Geometric Perfect Fluids from Extended Gravity
Salvatore Capozziello, Carlo Alberto Mantica, Luca Guido Molinari
A main issue in cosmology and astrophysics is whether the dark sector phenomenology originates from particle physics, then requiring the detection of new fundamental components, or…
Doubly Torqued Vectors and a classification of Doubly Twisted and Kundt spacetimes
Carlo Alberto Mantica, Luca Guido Molinari
The simple structure of doubly torqued vectors allows for a natural characterization of doubly twisted down to warped spacetimes, as well as Kundt spacetimes down to PP waves. For…
A simple characterization of doubly twisted spacetimes
Carlo Alberto Mantica, Luca Guido Molinari
In this note we characterize 1+n doubly twisted spacetimes in terms of `doubly torqued' vector fields. They extend Bang-Yen Chen's characterization of twisted and generalized Rober…
General properties of gravity vacuum solutions
Salvatore Capozziello, Carlo Alberto Mantica, Luca Guido Molinari
General properties of vacuum solutions of gravity are obtained by the condition that the divergence of the Weyl tensor is zero and . Specifically, a theorem state…
On the uniqueness of a shear-vorticity-acceleration-free velocity field in space-times
Luca Guido Molinari, Adriano Tacchini, Carlo Alberto Mantica
We prove that in space-times a velocity field that is shear, vorticity and acceleration-free, if any, is unique up to reflection, with these exceptions: generalized Robertson-Walke…
Cosmological perfect fluids in higher-order gravity
Salvatore Capozziello, Carlo Alberto Mantica, Luca Guido Molinari
We prove that in Robertson-Walker space-times (and in generalized Robertson-Walker spacetimes of dimension greater than 3 with divergence-free Weyl tensor) all higher-order gravita…