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SUMMARY:Quantum gravity as a group field theory: fundamental dynamics of q
 uantum space and effective (quantum) cosmology - Daniele Oriti (AEI Golm)
DTSTART:20130510T120000Z
DTEND:20130510T130000Z
UID:TALK44524@talks.cam.ac.uk
CONTACT:Dr Joan Camps
DESCRIPTION:Group field theory (GFT) is  a second quantized reformulation 
 of Loop Quantum Gravity and\, at the same time\, a generalization of matri
 x models for 2d gravity and lattice gravity path integrals. \n\nIn the fir
 st part of the talk\, we give an introduction to the basic features of the
  GFT formalism\, mainly from the point of view of simplicial geometry. We 
 discuss the nature of the proposed fundamental degrees of freedom of space
 time\, and of their quantum dynamics\, and give an overview of recent resu
 lts and research directions. We also emphasize the strict relation with ca
 nonical Loop Quantum Gravity\, tensor models and lattice gravity path inte
 grals.\n\nIn the second part of the talk\, we show that effective cosmolog
 ical equations for continuum homogeneous geometries can be derived directl
 y from fundamental GFTs. The relevant quantum states are GFT condensates\,
  and a form of nonlinear quantum cosmology arises as the hydrodynamics of 
 the system\, in the same way in which Gross-Pitaevskii equations arise fro
 m the quantum microscopic dynamics of real Bose condensates. A continuum s
 pacetime emerges then from GFT as a quantum fluid\, made of discrete pre-g
 eometric building blocks.
LOCATION:Pavilion B Potter Room (B1.19)
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