PIRSA:25060063

Spinfoams and the discreteness of time

APA

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

MLA

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

BibTex

          @misc{ scivideos_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 for Theoretical Physics},
            year = {2025},
            month = {jun},
            note = {PIRSA:25060063 see, \url{https://scivideos.org/index.php/pirsa/25060063}}
          }
          

Francesca Vidotto Western University

Talk numberPIRSA:25060063
Talk Type Conference

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.