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University of Cambridge > Talks.cam > CQIF Seminar > Quantum graphity: a model of emergent locality in quantum gravity

## Quantum graphity: a model of emergent locality in quantum gravityAdd to your list(s) Download to your calendar using vCal - Fotini Markopoulou (Perimeter Institute for Theoretical Physics)
- Thursday 08 January 2009, 14:00-15:00
- MR14, Centre for Mathematical Sciences.
If you have a question about this talk, please contact Lawrence Ioannou. Quantum graphity is a background independent condensed matter model for emergent locality, spatial geometry and matter in quantum gravity. 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 dynamically 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 string-net condensation mechanism of Levin and Wen. In addition, in such a model, observable effects of emergent locality such as its imprint on the CMB can be studied. Finding the right dynamics for the desired ground state is ongoing work and I will review some of the basic results with an emphasis on the use of methods from quantum information theory such as topological order and the use of the Lieb-Robinson bounds to find the speed of light in the system. This talk is part of the CQIF Seminar series. ## This talk is included in these lists:- All CMS events
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