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Related Experiment Video

Updated: May 7, 2026

Setting Limits on Supersymmetry Using Simplified Models
07:46

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

Evidence for maximal acceleration and singularity resolution in covariant loop quantum gravity.

Carlo Rovelli1, Francesca Vidotto

  • 1Aix Marseille Université, CNRS, CPT, UMR 7332, 13288 Marseille, France, and Université de Toulon, CNRS, CPT, UMR 7332, 83957 La Garde, France.

Physical Review Letters
|September 17, 2013
PubMed
Summary

Covariant loop gravity, a spin foam theory, predicts a maximum acceleration, preventing curvature singularities. This finding aligns with previous cosmological and black hole research using canonical methods.

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Area of Science:

  • Theoretical physics
  • Quantum gravity

Background:

  • Curvature singularities are problematic in general relativity, appearing in black holes and the early universe.
  • Canonical loop quantum gravity has shown promise in resolving these singularities.

Purpose of the Study:

  • To investigate whether covariant loop gravity (spin foam theory) also predicts a mechanism to avoid curvature singularities.
  • To explore the implications of maximal acceleration in quantum gravity.

Main Methods:

  • A simple argument based on the principles of covariant loop gravity (spin foam theory).

Main Results:

  • Covariant loop gravity predicts a fundamental upper limit on acceleration.
  • This maximal acceleration inherently prevents the formation of curvature singularities.

Conclusions:

  • The results from covariant loop gravity support and extend findings from canonical loop quantum gravity.
  • Spin foam theory offers a consistent framework for singularity-free cosmology and black hole physics.