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SUMMARY:Universe in a black hole with spin and torsion
DTSTART;VALUE=DATE-TIME:20200925T160000Z
DTEND;VALUE=DATE-TIME:20200925T163000Z
DTSTAMP;VALUE=DATE-TIME:20260305T173405Z
UID:indico-contribution-313@indico.uni.edu.pe
DESCRIPTION:Speakers: Nikodem Poplawski (University of New Haven)\nThe con
 servation law for the total (orbital and spin) angular momentum of a Dirac
  particle in the presence of gravity requires that spacetime is not only c
 urved\, but also has a nonzero torsion.\nThe coupling between the spin and
  torsion in the Einstein-Cartan theory of gravity generates gravitational 
 repulsion at extremely high densities.\nWe consider gravitational collapse
  of a spin-fluid sphere into a black hole.\nWe show that a singularity is 
 replaced with a nonsingular bounce if there is no shear.\nWe also show tha
 t torsion and quantum particle production during contraction avoid a singu
 larity even if shear is present.\nParticle production during expansion can
  generate a finite period of inflation and produce enormous amounts of mat
 ter.\nThe resulting closed universe on the other side of the event horizon
  may have several bounces.\nSuch a universe is oscillatory\, with each cyc
 le larger in size then the previous cycle\, until it reaches the cosmologi
 cal size and expands indefinitely.\nOur universe might have therefore orig
 inated from a black hole.\n\nhttps://indico.uni.edu.pe/event/85/contributi
 ons/313/
LOCATION:Lima\, Perú
URL:https://indico.uni.edu.pe/event/85/contributions/313/
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