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SUMMARY:Quantum graphity:  a model of emergent locality in quantum gravity
  - Fotini Markopoulou (Perimeter Institute for Theoretical Physics)
DTSTART:20090108T140000Z
DTEND:20090108T150000Z
UID:TALK16065@talks.cam.ac.uk
CONTACT:Lawrence Ioannou
DESCRIPTION:Quantum graphity is a background independent condensed matter 
 model for emergent locality\, spatial geometry and matter in quantum gravi
 ty.  The states of the system are given by bosonic degrees of freedom on a
  dynamical graph on N vertices. At high energy\, the graph is the complete
  graph on N vertices and the physics is invariant under the full symmetric
  group acting on the vertices and highly non-local.  The ground state dyna
 mically breaks the permutation symmetry to translations and rotations.  In
  this phase the system is ordered\, low-dimensional and local.  The model 
 gives rise to an emergent U(1) gauge theory in the ground state by the str
 ing-net condensation mechanism of Levin and Wen.    In addition\, in such 
 a model\, observable effects of emergent locality such as its imprint on t
 he 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 quantum information theory suc
 h as topological order and the use of the Lieb-Robinson bounds to find the
  speed of light in the system.
LOCATION:MR14\, Centre for Mathematical Sciences
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