Planck stars
Abstract
Quantumgravitational pressure can stop gravitational collapse and cause a bounce. We observe that: (i) due to the huge time dilation, the process can last microseconds in local proper time and billions of years observed from the outside; (ii) the bounce volume can be much larger than planckian, because the onset of quantumgravity effects is governed by density, not size; (iii) the emerging object can then be bigger than planckian by a factor (m/m_{P})^{n}, where m is the initial mass, m_{P} is the Planck mass, and n positive; (iv) the interior of an evaporating hole can keep memory of the initial mass, providing an independent scale for the physics of the final explosion. If so, primordial black holes could produce a detectable signal of quantum gravitational origin, which we estimate, under some hypotheses, around the wavelength 10^{14} cm.
 Publication:

International Journal of Modern Physics D
 Pub Date:
 December 2014
 DOI:
 10.1142/S0218271814420267
 arXiv:
 arXiv:1401.6562
 Bibcode:
 2014IJMPD..2342026R
 Keywords:

 Quantum gravity phenomenology;
 black holes;
 Hawking evaporation;
 04.70.Dy;
 04.60.Bc;
 Quantum aspects of black holes evaporation thermodynamics;
 Phenomenology of quantum gravity;
 General Relativity and Quantum Cosmology;
 Astrophysics  High Energy Astrophysical Phenomena;
 High Energy Physics  Theory
 EPrint:
 6 pages, 3 figures. Nice paper