Spacetime emergence in group field theory

Particle Physics Theory seminar

Spacetime emergence in group field theory

Event details


Spacetime emergence in group field theory


The failure of a simple perturbative quantisation of general relativity
suggests that quantum gravity is fundamentally non-perturbative, defined
by a path integral or sum over spacetime histories. In some approaches
even the spacetime manifold and its topology are not fixed background
structures but part of the sum: we then have a quantum theory "of, not
on spacetime". I will briefly review one such approach, group field
theory, which can be seen as an extension of matrix and tensor models to
higher dimensions. I will highlight a number of applications to
cosmology, including the derivation of an effective Friedmann equation
(with higher-curvature corrections leading to a bounce) for homogeneous
cosmology, and recent work showing how a spacetime metric can be
extracted from this formalism, paving the way towards a physical
interpretation of many other solutions of the theory.

About Particle Physics Theory seminars

The Particle Physics Theory seminar is a weekly series of talks reflecting the diverse interests of the group. Topics include analytic and numerical calculations based on the Standard Model of elementary particle physics, theories exploring new physics, as well as more formal developments in gauge theories and gravity..

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