PIRSA:25060063 Conference

DOI10.48660/25060063

Conference/School: Lee's Fest: Quantum Gravity and the Nature of Time

Vidotto, F. (2025). Spinfoams and the discreteness of time. Perimeter Institute. https://pirsa.org/25060063

Vidotto, Francesca. Spinfoams and the discreteness of time. Perimeter Institute, Jun. 03, 2025, https://pirsa.org/25060063 

@misc{ pirsa_PIRSA:25060063,
  doi = {10.48660/25060063},
  url = {https://pirsa.org/25060063},
  author = {Vidotto, Francesca},
  keywords = {},
  language = {en},
  title = {Spinfoams and the discreteness of time},
  publisher = {Perimeter Institute},
  year = {2025},
  month = {jun},
  note = {PIRSA:25060063 see, \url{https://pirsa.org}}
}

Abstract

The covariant dynamics of Loop Quantum Gravity answers the question of what we can in principle predict and observe in quantum gravity. It features a characteristic discrete quantum evolution, as proposed in a seminal paper by Smolin and Markoupoulou in 1997. Spinfoam transition amplitudes are local exactly thanks to this form of discreteness. Another property of the amplitudes is to be exactly finite when their formulation includes a cosmological constant: this adds further to the fundamental discreteness of spacetime quanta, and again it is a feature rooted in Lee’s Smolin seminal works.

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