Publications (44)
Interior Kerr solutions with the Newman-Janis algorithm starting with static physically reasonable space-times
Stefano Viaggiu
We present a simple approach for obtaining Kerr interior solutions with the help of the Newman-Janis algorithm (NJA) starting with static space-times describing physically sensible…
Entropy, temperature and internal energy of trapped gravitons and corrections to the Black Hole entropy
Stefano Viaggiu
In this paper we study the proposal present in \cite{1} concerning the statistical description of trapped gravitons and applied to derive the semi-classical black hole (BH) entropy…
A quantum Friedmann flat spacetime: Uncertainty Relations, Thermodynamics and some cosmological consequences
Stefano Viaggiu
We present Friedmann flat spacetime uncertainty relations (STUR) together with some cosmological implications. An interesting link between the Principle of "gravitational stability…
Physically viable rotating mass solutions surrounding Kerr black hole
Stefano Viaggiu
There exists in literature an increasing interest in the study of mass distributions surrounding black holes as describing dark matter halo in spiral galaxies. Motivated by this in…
Rigidly rotating dust solutions depending upon harmonic functions
Stefano Viaggiu
We write down the relevant field equations for a stationary axially symmetric rigidly rotating dust source in such a way that the general solution depends upon the solution of an e…
Modeling usual and unusual anisotropic spheres
Stefano Viaggiu
In this paper, we study anisotropic spheres built from known static spherical solutions. In particular, we are interested in the physical consequences of a "small" departure from a…