9 papers
Gravitational lensing in a spacetime with extra dimensions
Mattia Villani
This is the fourth paper of a series in which we consider the possibility to use cosmological extra dimensions to explain the accelerated expansion of the Universe and the rotation…
Cosmological extra dimensions can mimic dark energy
Mattia Villani
We present a simple model of a higher dimensional spacetime in which the 4d submanifold is a FLRW metric, while the extra dimensions are compactified to a hypersphere. We calculate…
Cosmological extra dimensions can mimic dark matter I. Dark matter in galaxies
Mattia Villani
We present a simple model with a n + 4-dimensional metric with compactified extra dimensions with a space dependent radius R. We show that changes in the profile of R are sourced b…
Gravitational waves from a binary source in higher dimensional spacetime with compactified extra dimensions
Mattia Villani
We consider the emission of gravitational waves (GW) from a compact binary in a spacetime with compactified extra dimensions. We solve the homogeneous and non-homogeneous wave equa…
Electromagnetic emission from a black-to-white hole transition -- Photospheric emission
Mattia Villani
We calculate the gamma ray emission from a black-to-white hole transition. We put forward a model for the prompt emission phase, based on the photospheric emission model with the u…
Quasi-normal modes of a multi-dimensional rotating Kerr black hole
Mattia Villani
The aim of this paper is to present a general way to calculate quasi-normal modes (QNM) of the Teukolsky equation for higher dimensional (d > 4) Kerr spacetime with compactified ex…