University of Cambridge > Talks.cam > DAMTP Friday GR Seminar > Quantum gravity as a group field theory: fundamental dynamics of quantum space and effective (quantum) cosmology

Quantum gravity as a group field theory: fundamental dynamics of quantum space and effective (quantum) cosmology

Add to your list(s) Download to your calendar using vCal

If you have a question about this talk, please contact Dr Joan Camps.

Group field theory (GFT) is a second quantized reformulation of Loop Quantum Gravity and, at the same time, a generalization of matrix models for 2d gravity and lattice gravity path integrals.

In the first 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 spacetime, and of their quantum dynamics, and give an overview of recent results and research directions. We also emphasize the strict relation with canonical Loop Quantum Gravity, tensor models and lattice gravity path integrals.

In the second part of the talk, we show that effective cosmological equations for continuum homogeneous geometries can be derived directly 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 from the quantum microscopic dynamics of real Bose condensates. A continuum spacetime emerges then from GFT as a quantum fluid, made of discrete pre-geometric building blocks.

This talk is part of the DAMTP Friday GR Seminar series.

Tell a friend about this talk:

This talk is included in these lists:

Note that ex-directory lists are not shown.

 

© 2006-2014 Talks.cam, University of Cambridge. Contact Us | Help and Documentation | Privacy and Publicity