67 citations · 236 across the 20 of their papers we have counts for
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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…
Cosmological perfect fluids in Gauss-Bonnet gravity
Salvatore Capozziello, Carlo Alberto Mantica, Luca Guido Molinari
In an -dimensional Friedmann-Robertson-Walker metric, it is rigorously shown that any analytical theory of gravity , where is the curvature scalar and $\cal G…
w=1/3 to w=-1 evolution in a Robertson-Walker space-time with constant scalar curvature
Luca Guido Molinari, Carlo Alberto Mantica
The Ricci tensor of a Robertson-Walker space-time is here specified by requiring constancy of the scalar curvature and a vanishing spatial curvature. By entering this Ricci tensor…
Perfect-fluid, generalised Robertson-Walker space-times, and Gray's decomposition
Carlo Alberto Mantica, Luca Guido Molinari, Young Jin Suh +1
We give new necessary and sufficient conditions on the Weyl tensor for generalized Robertson-Walker (GRW) space-times to be perfect-fluid space-times. For GRW space-times, we deter…