454 citations · 3.8k across the 68 of their papers we have counts for
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Transverse frames for Petrov type I spacetimes: a general algebraic procedure
Virginia Re, Marco Bruni, David R. Matravers +1
We develop an algebraic procedure to rotate a general Newman-Penrose tetrad in a Petrov type I spacetime into a frame with Weyl scalars and equal to zero, assuming…
Non-linear relativistic perturbation theory with two parameters
Carlos F. Sopuerta, Marco Bruni, Leonardo Gualtieri
An underlying fundamental assumption in relativistic perturbation theory is the existence of a parametric family of spacetimes that can be Taylor expanded around a background. Sinc…
Singularities on the brane aren't isotropic
Marco Bruni, Peter K. S. Dunsby
Recent studies of homogeneous anisotropic universe models in the brane world scenario show that the cosmological singularity in this context is isotropic. It has therefore been sug…
Second Order Perturbations of Flat Dust FLRW Universes with a Cosmological Constant
Felipe C. Mena, Reza Tavakol, Marco Bruni
We summarize recent results concerning the evolution of second order perturbations in flat dust irrotational FLRW models with . We show that asymptotically these perturbati…
Two-parameter non-linear spacetime perturbations: gauge transformations and gauge invariance
Marco Bruni, Leonardo Gualtieri, Carlos F. Sopuerta
An implicit fundamental assumption in relativistic perturbation theory is that there exists a parametric family of spacetimes that can be Taylor expanded around a background. The c…