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CATEGORIES:DAMTP Friday GR Seminar
SUMMARY:Spin systems as toy models for emergent gravity -
Fotini Markopoulou\, Perimeter Institute
DTSTART;TZID=Europe/London:20110311T150000
DTEND;TZID=Europe/London:20110311T160000
UID:TALK29981AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/29981
DESCRIPTION:A number of recent proposals for a quantum theory
of gravity are based on the idea that spacetime ge
ometry and gravity are derivative concepts and onl
y apply at an approximate level. There are two fu
ndamental challenges to any such approach. At the
conceptual level\, there is a clash between the "t
imelessness"\nof general relativity and emergence.
Second\, the lack of a fundamental spacetime make
s difficult the straightforward application of wel
l-known methods of statistical physics to the prob
lem. We initiate a study of such problems using t
oy models for emergent geometry and gravity based
on evolution of quantum networks with no a priori
geometric notions.\n\nIn this talk we present two
models. The first is a model of emergent (flat) s
pace and matter and we show how to use methods fro
m quantum information theory\nto derive features s
uch as speed of light from a non-geometric quantum
system. The second model exhibits interacting mat
ter and geometry\, with the geometry defined by th
e behavior of matter. This model has primitive not
ions of gravitational attraction\, and exhibits en
tanglement between matter and geometry and thermal
ization of the quantum geometry.
LOCATION:Pavilion B\, MR11
CONTACT:David Kubiznak
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