PIRSA:23030103

Entropy versus the Action in Causal Set Theory

Surya, S. (2023). Entropy versus the Action in Causal Set Theory. Perimeter Institute. https://pirsa.org/23030103

Surya, Sumati. Entropy versus the Action in Causal Set Theory. Perimeter Institute, Mar. 09, 2023, https://pirsa.org/23030103 

          @misc{ pirsa_PIRSA:23030103,
            doi = {10.48660/23030103},
            url = {https://pirsa.org/23030103},
            author = {Surya, Sumati},
            keywords = {Quantum Gravity},
            language = {en},
            title = {Entropy versus the Action in  Causal Set Theory},
            publisher = {Perimeter Institute},
            year = {2023},
            month = {mar},
            note = {PIRSA:23030103 see, \url{https://pirsa.org}}
          }

Sumati Surya Raman Research Institute

DOI 10.48660/23030103
Collection
Talk Type Scientific Series
Subject

Abstract

The Lorentzian path sum in causal set theory(CST)  can be defined using the discrete EInstein-Hilbert or Benincasa-Dowker-Glaser(BDG)  action. It has been a long standing question  in CST whether  the path sum is  dominated by a class of non-continuum like layered posets — this would make it much harder to find a dynamically generated continuum approximation —  or whether the BDG action suppresses this contribution.  In this talk I will discuss a series of results that show that to  leading order in the saddle point approximation,  this dominating  class of layered posets is strongly suppressed. Moreover this is true for a  more general class of actions which include the BDG action.   We conclude with some remarks on the interpretation of these results and related  open questions. 

Zoom link:  https://pitp.zoom.us/j/91794153633?pwd=TTFnS0hpQ2s5eFVDM3k5ZDkxcndkUT09