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SUMMARY:Ted Jacobson(Substituted by Rodrigo Andrade e Silva)
DTSTART:20220314T144000Z
DTEND:20220314T152000Z
DTSTAMP:20260423T004039Z
UID:PhysBound/3
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/PhysBound/3/
 ">Causal diamonds in 2+1 dimensional quantum gravity</a>\nby Ted Jacobson(
 Substituted by Rodrigo Andrade e Silva) as part of Physics @ Boundaries Wo
 rkshop\n\n\nAbstract\nWe identify the reduced phase space of causal diamon
 ds with fixed edge\nlength in pure 2+1 dimensional gravity with a negative
  cosmological constant\,\nwhich turns out to be the cotangent bundle of th
 e homogeneous space\n$Diff^+(S^1)/PSL(2\,R)$. Isham’s group theoretic qu
 antization scheme is applied to\nthis nonlinear phase space. We find that 
 the twist of the boundary curve (which\nis also the ``spin” of the diamo
 nd) is quantized in integer or half-integer\nmultiples of the ratio of the
  Planck length to the diamond edge length.\n
LOCATION:https://researchseminars.org/talk/PhysBound/3/
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