7 papers
Non-trivial boundary conditions in general-relativistic models
Davide Astesiano, Matteo Luca Ruggiero, Federico Re
We propose an alternative interpretation of dark matter effects within the framework of General Relativity. In particular, we suggest that, in astrophysical and cosmological contex…
On the catastrophe time of fluids under the action of a gravitational field
D. Astesiano, G. Ortenzi, M. L. Ruggiero
Motivated by the central role of the Zel'dovich approximation in the description of cosmic structure formation through gravitational collapse, we investigate Burgers-type dynamics…
Gravitational lensing observables in stationary and axisymmetric solutions in general relativity
Matteo Luca Ruggiero, Davide Astesiano
We investigate light propagation in self-gravitating systems composed of an axially symmetric, stationary, rotating dust fluid. These configurations are intrinsically relativistic,…
Physics is simple only when analyzed locally
Matteo Luca Ruggiero
The definition of a reference frame in General Relativity is achieved through the construction of a congruence of time-like world-lines. In this framework, splitting techniques ena…
On the low-energy limit of stationary and axisymmetric solutions in General Relativity
Davide Astesiano, Matteo Luca Ruggiero
We study the low-energy limit of General Relativity in the presence of stationarity and axial symmetry, coupled to dust. Specifically, we demonstrate that differences between the d…
Effects of gravitational waves on electromagnetic fields
Matteo Luca Ruggiero
We focus on the interaction of a plane gravitational wave with electromagnetic fields and we describe this interaction in the proper detector frame where, thanks to the introductio…