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CATEGORIES:DAMTP Friday GR Seminar
SUMMARY:Quantum gravity as a group field theory: fundament
al dynamics of quantum space and effective (quantu
m) cosmology - Daniele Oriti (AEI Golm)
DTSTART;TZID=Europe/London:20130510T130000
DTEND;TZID=Europe/London:20130510T140000
UID:TALK44524AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/44524
DESCRIPTION:Group field theory (GFT) is a second quantized re
formulation of Loop Quantum Gravity and\, at the s
ame time\, a generalization of matrix models for 2
d gravity and lattice gravity path integrals. \n\n
In the first part of the talk\, we give an introdu
ction to the basic features of the GFT formalism\,
mainly from the point of view of simplicial geome
try. We discuss the nature of the proposed fundame
ntal degrees of freedom of spacetime\, and of thei
r quantum dynamics\, and give an overview of recen
t results and research directions. We also emphasi
ze the strict relation with canonical Loop Quantum
Gravity\, tensor models and lattice gravity path
integrals.\n\nIn the second part of the talk\, we
show that effective cosmological equations for con
tinuum homogeneous geometries can be derived direc
tly from fundamental GFTs. The relevant quantum st
ates are GFT condensates\, and a form of nonlinear
quantum cosmology arises as the hydrodynamics of
the system\, in the same way in which Gross-Pitaev
skii equations arise from the quantum microscopic
dynamics of real Bose condensates. A continuum spa
cetime emerges then from GFT as a quantum fluid\,
made of discrete pre-geometric building blocks.
LOCATION:Pavilion B Potter Room (B1.19)
CONTACT:Dr Joan Camps
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