Bouncing cosmologies from quantum gravity condensates

TL;DR

This paper derives cosmological dynamics from quantum gravity condensates, showing how quantum corrections lead to a bounce that resolves classical singularities, thus providing a quantum gravity-based model of the universe's evolution.

Contribution

It introduces a novel approach to derive large-scale cosmology from group field theory condensates, connecting quantum gravity with observable universe dynamics.

Findings

Recover Friedmann equations in semi-classical limit

Quantum corrections induce a bounce avoiding singularities

Provides a quantum gravity foundation for bouncing cosmologies

Abstract

We show how the large-scale cosmological dynamics can be obtained from the hydrodynamics of isotropic group field theory condensate states in the Gross-Pitaevskii approximation. The correct Friedmann equations are recovered in the semi-classical limit for some choices of the parameters in the action for the group field theory, and quantum gravity corrections arise in the high-curvature regime causing a bounce which generically resolves the big-bang and big-crunch singularities.