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SUMMARY:•	Tunneling into the Past: Quantum Creation of Time Machines
DTSTART;VALUE=DATE-TIME:20261030T073000Z
DTEND;VALUE=DATE-TIME:20261030T074500Z
DTSTAMP;VALUE=DATE-TIME:20261104T222807Z
UID:indico-contribution-6272@cern.ch
DESCRIPTION:Speakers: Victor Kuryan ()\nOne of the predictions of general 
 relativity is the existence of spacetimes with nontrivial topology and cau
 sal structure. In principle\, the real three-dimensional space could be mu
 ltiply connected and could contain wormholes. As shown in the work of Novi
 kov\, a stable wormhole—if such an object exists—could\, in principle\
 , be turned into a time machine. When quantum field fluctuations are taken
  into account in a spacetime containing such a wormhole\, these fluctuatio
 ns grow significantly as the Cauchy horizon is approached. In particular\,
  the renormalized stress energy tensor of the quantum field diverges at th
 e Cauchy horizon\, leading to an infinite energy density. This divergence 
 is commonly interpreted as a sign that building a time machine is impossib
 le—this is the essence of the chronology protection conjecture. However\
 , that conclusion was reached by treating the wormhole throats' motion cla
 ssically and by evaluating quantum effects in a fixed background geometry.
 \nIn contrast\, in the present paper we apply quantum mechanics to describ
 e the motion of the wormhole throats. Within this approach\, we obtain an 
 estimate for the probability of creating a time machine\, and this probabi
 lity is found to be of order unity. The process closely resembles quantum 
 tunnelling as known from ordinary quantum mechanics.\n\nhttps://indico.par
 ticle.mephi.ru/event/626/contributions/6272/
LOCATION: Conference Hall 4
URL:https://indico.particle.mephi.ru/event/626/contributions/6272/
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