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SUMMARY:Planck Stars: theory and observations -  Francesca Vidotto (Bilba
 o)
DTSTART:20180227T160000Z
DTEND:20180227T170000Z
UID:TALK97393@talks.cam.ac.uk
CONTACT:Professor Maciej Dunajski
DESCRIPTION: Non-perturbative quantum gravity prevents the formation of cu
 rvature singularities\, and replaces it with a quantum region evocatively
  called a "Planck Star". The presence of\nquantum fluctuations of the met
 ric may induce black holes to decay into a white hole. These quantum fl
 uctuations appears in a characteristic time shorter than the evaporatio
 n time\, therefore the black-to-white transition can solve\nthe puzzle of 
 the ultimate fate of black holes\, and provides a solution for the informa
 tion paradox. Calculating the exact black-hole lifetime is a major chall
 enge for a quantum gravity theory\, currently under investigation in\nLoop
  Quantum Gravity. The phenomenon opens a new window in quantum-gravity ph
 enomenology\, in connection with the existence of primordial black hole
 s. Primordial black holes decaying in this way appears compatible with 
 the current\ncosmological constraints. I discuss the possibility to obser
 ve an astrophysical emission from the explosion of primordial black hol
 e in different wavelengths\, including the mysterious Fast Radio Bursts.
  Those emissions can be\ndiscriminated from other astrophysical sources be
 cause of the peculiar way the emitted wavelength scales with the distance.
  In particular\, the spectrum of the diffuse radiation produced by those o
 bjects presents a distortion due to\nthis scaling. \n
LOCATION:MR11
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