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SUMMARY:Sayyed Rassouli - 'Volume as a Clock: Observers and Topology Chang
 e in Quantum Gravity'
DTSTART:20261015T050000Z
DTEND:20261015T070000Z
DTSTAMP:20261021T230700Z
UID:indico-event-1441@indico.ibs.re.kr
DESCRIPTION:Different notions of time arise from different choices of obse
 rver. In cosmological settings\, a particularly natural choice is spacetim
 e volume\, which is conjugate to the cosmological constant. This gives ris
 e to unimodular time\, deparametrizing the Wheeler–DeWitt equation into 
 a Schrödinger-like evolution equation. I will first explain how this cons
 truction appears in arbitrary dimensions\, with particular emphasis on the
  four-dimensional case.\nI will then use a two-dimensional toy model to qu
 antise global Lorentzian de Sitter space\, where quantum mechanically ther
 e is a region in which topology change can occur. More generally\, I will 
 explain how adding these types of observers and clocks classically encodes
  topology change and orientation change\, and how this structure can be as
 sociated with a Morse function. I will also show the holography of such ob
 servers in the context of near horizon black holes.\n\nhttps://indico.ibs.
 re.kr/event/1441/
URL:https://indico.ibs.re.kr/event/1441/
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