2 research outputs found
Quasinormal mode characterization of evaporating mini black holes
According to recent theoretical developments, it might be possible to produce
mini black holes in the high energy experiments in the LHC at CERN. We propose
here a model based on the -dimensional Vaidya metric in double null
coordinates for these decaying black holes. The associated quasinormal modes
are considered. It is shown that only in the very last instants of the
evaporation process the stationary regime for the quasinormal modes is broken,
implying specific power spectra for the perturbations around these mini
black-holes. From scattered fields one could recover, in principle, the black
hole parameters as well as the number of extra dimensions. The still mysterious
final fate of such objects should not alter significantly our main conclusions.Comment: v4: 9 pages, 3 figures. Minor correction
A model displaying extremely inhomogeneous matter distribution in General Relativity
We consider a toy metric in four dimensional space-time defined in terms of a
recursive hierarchical prescription. The matter distribution turns out to be
extremely inhomogeneous. Surprisingly, for very large samples the average mass
density tends (very slowly) to a constant. There is no trace of fractal
dimension left.Comment: 7 pages, 3 figure