Sing18: Planck Stars: the final fate of quantum non-singular ... by Francesca Vidotto

Описание: Lecture at the 2nd workshop on "Singularities of general relativity and their quantum fate" 23.05.2018, Warsaw.

Loop Quantum Gravity presents a spacetime quantum discreteness that devoids the theory from any curvature singularity. The resulting dynamics can be understood in terms of an effective quantum potential that stops the collapse into the central black-hole singularity, then replaced by maximal energy-density region evocatively called a "Planck Star". The collapsing region may undergo quantum fluctuations of the metric such that a black hole turns into an expanding region, i.e. a white hole. In the effective theory, the Planck Star connects these two phases of the hole life. I discuss the results of such a transition: an explosive event, and possibly a "remnant". The final explosion can be detected today for black holes that are sufficiently old and sufficiently small. Primordial black holes, that may have formed in the early universe, satisfy these requirements. I discuss the possibility of observing astrophysical emission from the explosion of primordial black holes in different wavelengths (submillimeter, radio, TeV). These emissions can be discriminated from other astrophysical sources because of a peculiar way the emitted wavelength scales with distance. I conclude illustrating the properties of this kind of black holes as possible dark matter component.

Slides avaiable at the workshop site: https://www.impan.pl/konferencje/bcc/...