PIRSA:24110066

Video URL

https://pirsa.org/24110066

Why there is (almost) nothing rather than something? On the cosmological constant problem.

Kowalski-Glikman, J. (2024). Why there is (almost) nothing rather than something? On the cosmological constant problem.. Perimeter Institute for Theoretical Physics. https://pirsa.org/24110066

Kowalski-Glikman, Jerzy. Why there is (almost) nothing rather than something? On the cosmological constant problem.. Perimeter Institute for Theoretical Physics, Nov. 14, 2024, https://pirsa.org/24110066 

          @misc{ scivideos_PIRSA:24110066,
            doi = {10.48660/24110066},
            url = {https://pirsa.org/24110066},
            author = {Kowalski-Glikman, Jerzy},
            keywords = {},
            language = {en},
            title = {Why there is (almost) nothing rather than something? On the cosmological constant problem.},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2024},
            month = {nov},
            note = {PIRSA:24110066 see, \url{https://scivideos.org/pirsa/24110066}}
          }

Jerzy Kowalski-Glikman University of Wrocław

Talk numberPIRSA:24110066
DOI10.48660/24110066
Source RepositoryPIRSA
Collection
Talk Type Scientific Series

Abstract

The failure to calculate the vacuum energy remains a central problem in theoretical physics. In my talk I present a new understanding of the cosmological constant problem, grounded in the insight that vacuum energy density can be expressed in terms of phase space volume. Introduction of a UV-IR regularization implies a relationship between the vacuum energy and entropy. Combining this insight with the holographic bound on entropy then yields a bound on the cosmological constant consistent with observations. It follows that the universe is large, and the cosmological constant is naturally small, because the universe is filled with a large number of degrees of freedom. The talk is based on our papers Phys.Rev.D 107 (2023) 12, 126016; e-Print: 2212.00901 [hep-th] and Int.J.Mod.Phys.D 32 (2023) 14, 2342004; e-Print: 2303.17495 [hep-th].