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CATEGORIES:Mathematical Physics Seminar
SUMMARY:Planck Stars: theory and observations -  Francesca
  Vidotto (Bilbao)
DTSTART;TZID=Europe/London:20180227T160000
DTEND;TZID=Europe/London:20180227T170000
UID:TALK97393AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/97393
DESCRIPTION: Non-perturbative quantum gravity prevents the for
 mation of curvature singularities\, and replaces i
 t with a quantum region evocatively called a "Plan
 ck Star". The presence of\nquantum fluctuations of
  the metric may induce black holes to decay into a
  white hole. These quantum fluctuations appears in
  a characteristic time shorter than the evaporatio
 n time\, therefore the black-to-white transition c
 an solve\nthe puzzle of the ultimate fate of black
  holes\, and provides a solution for the informati
 on paradox. Calculating the exact black-hole lifet
 ime is a major challenge for a quantum gravity the
 ory\, currently under investigation in\nLoop Quant
 um Gravity. The phenomenon opens a new window in q
 uantum-gravity phenomenology\, in connection with 
 the existence of primordial black holes. Primordia
 l black holes decaying in this way appears compati
 ble with the current\ncosmological constraints. I 
 discuss the possibility to observe an astrophysica
 l emission from the explosion of primordial black 
 hole in different wavelengths\, including the myst
 erious Fast Radio Bursts. Those emissions can be\n
 discriminated from other astrophysical sources bec
 ause of the peculiar way the emitted wavelength sc
 ales with the distance. In particular\, the spectr
 um of the diffuse radiation produced by those obje
 cts presents a distortion due to\nthis scaling. \n
LOCATION:MR11
CONTACT:Professor Maciej Dunajski
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