Quantum gravity phenomenology in the infrared

Laurent Freidel, Jerzy Kowalski-Glikman, Robert G. Leigh, Djordje Minic

Research output: Contribution to journalArticlepeer-review


Quantum gravity effects are traditionally tied to short distances and high energies. In this essay, we argue that, perhaps surprisingly, quantum gravity may have important consequences for the phenomenology of the infrared. We center our discussion around a conception of quantum gravity involving a notion of quantum spacetime that arises in metastring theory. This theory allows for an evolution of a cosmological Universe in which string-dual degrees of freedom decouple as the Universe ages. Importantly, such an implementation of quantum gravity allows for the inclusion of a fundamental length scale without introducing the fundamental breaking of Lorentz symmetry. The mechanism seems to have potential for an entirely novel source for dark matter/energy. The simplest observational consequences of this scenario may very well be residual infrared modifications that emerge through the evolution of the Universe.

Original languageEnglish (US)
Article number2141002
JournalInternational Journal of Modern Physics D
Issue number14
StatePublished - Oct 15 2021


  • Quantum gravity phenomenology
  • cosmology
  • metaparticles

ASJC Scopus subject areas

  • Mathematical Physics
  • Astronomy and Astrophysics
  • Space and Planetary Science


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