Manifest non-locality in quantum mechanics, quantum field theory and quantum gravity

Laurent Freidel, Robert G. Leigh, Djordje Minic

Research output: Contribution to journalArticlepeer-review


We summarize our recent work on the foundational aspects of string theory as a quantum theory of gravity. We emphasize the hidden quantum geometry (modular spacetime) behind the generic representation of quantum theory and then stress that the same geometric structure underlies a manifestly T-duality covariant formulation of string theory, that we call metastring theory. We also discuss an effective non-commutative description of closed strings implied by intrinsic non-commutativity of closed string theory. This fundamental non-commutativity is explicit in the metastring formulation of quantum gravity. Finally we comment on the new concept of metaparticles inherent to such an effective non-commutative description in terms of bi-local quantum fields.

Original languageEnglish (US)
Article number1941004
JournalInternational Journal of Modern Physics A
Issue number28
StatePublished - Oct 10 2019


  • Non-locality
  • metastring theory
  • modular spacetime
  • non-commutativity

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Astronomy and Astrophysics

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