PIRSA:26040130

Video URL

https://pirsa.org/26040130

Can a multiverse theory explain the H_0 tension, the S_8 tension, the w(z) < -1 behavior and many other cosmological observations? Maybe!

Ambjorn, J. (2026). Can a multiverse theory explain the H_0 tension, the S_8 tension, the w(z) < -1 behavior and many other cosmological observations? Maybe!. Perimeter Institute for Theoretical Physics. https://pirsa.org/26040130

Ambjorn, Jan. Can a multiverse theory explain the H_0 tension, the S_8 tension, the w(z) < -1 behavior and many other cosmological observations? Maybe!. Perimeter Institute for Theoretical Physics, Apr. 30, 2026, https://pirsa.org/26040130 

          @misc{ scivideos_PIRSA:26040130,
            doi = {10.48660/26040130},
            url = {https://pirsa.org/26040130},
            author = {Ambjorn, Jan},
            keywords = {Quantum Gravity},
            language = {en},
            title = {Can a multiverse theory explain the H_0 tension, the S_8 tension, the w(z) < -1 behavior and many other cosmological observations? Maybe!},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2026},
            month = {apr},
            note = {PIRSA:26040130 see, \url{https://scivideos.org/pirsa/26040130}}
          }

Jan Ambjorn University of Copenhagen

Talk numberPIRSA:26040130
DOI10.48660/26040130
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

A simple multiverse model explains the late time exponential expansion of our universe without the need of a cosmological constant. Assuming that the local measurement of H_0 is correct, it also give a better fit to data than the standard LCDM model, as well as a z-dependent state parameter w(z) that is not incompatible with the latest DESI data. An (tentative) underlying microscopic theory of the multiverse model, based on W_3 and exceptional Jordan algebras may allow us to calculate the expansion rate of our universe.