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CATEGORIES:CQIF Seminar
SUMMARY:Quantum graphity: a model of emergent locality in
quantum gravity - Fotini Markopoulou (Perimeter I
nstitute for Theoretical Physics)
DTSTART;TZID=Europe/London:20090108T140000
DTEND;TZID=Europe/London:20090108T150000
UID:TALK16065AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/16065
DESCRIPTION:Quantum graphity is a background independent conde
nsed matter model for emergent locality\, spatial
geometry and matter in quantum gravity. The state
s of the system are given by bosonic degrees of fr
eedom on a dynamical graph on N vertices. At high
energy\, the graph is the complete graph on N vert
ices and the physics is invariant under the full s
ymmetric group acting on the vertices and highly n
on-local. The ground state dynamically breaks the
permutation symmetry to translations and rotation
s. In this phase the system is ordered\, low-dime
nsional and local. The model gives rise to an eme
rgent U(1) gauge theory in the ground state by the
string-net condensation mechanism of Levin and We
n. In addition\, in such a model\, observable e
ffects of emergent locality such as its imprint on
the CMB can be studied. \n\n\nFinding the right
dynamics for the desired ground state is ongoing
work and I will review some of the basic results w
ith an emphasis on the use of methods from quantu
m information theory such as topological order and
the use of the Lieb-Robinson bounds to find the s
peed of light in the system.
LOCATION:MR14\, Centre for Mathematical Sciences
CONTACT:Lawrence Ioannou
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