4 papers
Coupling of radial and non-radial oscillations of Neutron stars
Andrea Passamonti, Marco Bruni, Leonardo Gualtieri +1
This is a progress report on our study of the coupling of first-order radial and non-radial relativistic perturbations of a static spherical star. Our goal is to investigate the ef…
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…
On Relativistic Perturbations of Second and Higher Order
M. Bruni, S. Matarrese, S. Mollerach +1
We present the results of a study of the gauge dependence of spacetime perturbations. In particular, we consider gauge invariance in general, we give a generating formula for gauge…
Singularities in Silent Universes: State of the Art
M. Bruni, H. van Elst, C. Uggla
After a brief overview of the so-called silent models and their present status, we consider the subclass of Bianchi Type--I models with a magnetic field source. Due to the presence…