PIRSA:23100068 Conference Quantum Gravity

DOI10.48660/23100068

Conference/School: Puzzles in the Quantum Gravity Landscape: viewpoints from different approaches

Dittrich, B. (2023). The simplicial Lorentzian path integral and spin foams. Perimeter Institute. https://pirsa.org/23100068

Dittrich, Bianca. The simplicial Lorentzian path integral and spin foams. Perimeter Institute, Oct. 27, 2023, https://pirsa.org/23100068 

@misc{ pirsa_PIRSA:23100068,
  doi = {10.48660/23100068},
  url = {https://pirsa.org/23100068},
  author = {Dittrich, Bianca},
  keywords = {Quantum Gravity},
  language = {en},
  title = {The simplicial Lorentzian path integral and spin foams},
  publisher = {Perimeter Institute},
  year = {2023},
  month = {oct},
  note = {PIRSA:23100068 see, \url{https://pirsa.org}}
}

Abstract

I will discuss two versions of the simplicial Lorentizian path integral, namely the (Lorentzian) quantum Regge and the spin foam version. I will do so in the simple context of de Sitter cosmology. This simple example will reveal the important role of light cone irregular configurations in the simplicial path integral — I will show that these can either lead to an exponentially enhanced or an exponentially suppressed amplitude. I will then highlight an important difference between the spin foams and quantum Regge path integral, which affects the probability for the creation of the (de Sitter) universe.

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