A no-singularity scenario in loop quantum gravity

TL;DR

This paper demonstrates that quantum effects in loop quantum gravity can eliminate spacelike singularities by modifying the effective gravitational actions, providing a no-singularity scenario.

Contribution

It introduces a systematic expansion method for effective actions in loop quantum gravity, showing how inverse-triad corrections remove singularities.

Findings

Inverse-triad corrections simplify asymptotic dynamics near singularities

Quantum effects remove spacelike singularities

Effective actions reflect modified space-time deformations

Abstract

Canonical methods allow the derivation of effective gravitational actions from the behavior of space-time deformations reflecting general covariance. With quantum effects, the deformations and correspondingly the effective actions change, revealing dynamical implications of quantum corrections. A new systematic way of expanding these actions is introduced showing as a first result that inverse-triad corrections of loop quantum gravity simplify the asymptotic dynamics near a spacelike collapse singularity. By generic quantum effects, the singularity is removed.