Jan 25 – 27, 2023
Lindenberg cultuurhuis
Europe/Amsterdam timezone

From the birth of CDT to a modified Friedmann equation that resolves the Hubble constant tension.

Jan 25, 2023, 9:10 AM
Valkhofzaal (Lindenberg cultuurhuis)


Lindenberg cultuurhuis

Ridderstraat 23, 6511 TM Nijmegen


Yoshiyuki WatabikiProf. Jan Ambjorn (Niels Bohr Institute & Radboud University)


We describe how the original 2d CDT model has been generalized in various ways: to a multicomponent W3 algebra model based on the exceptional Jordan algebra and to a four-dimensional CDT model. Remarkably, under certain assumptions, both these generalisations lead to the same modified Friedmann equation where the present expansion of our universe is driven not by the cosmological constant, but by the creation of baby universes. We will discuss how the model seems to resolve the tension between the Hubble constant determined from early time observations (the CMB data) and from present days local direct measurements.

Primary authors

Yoshiyuki Watabiki Prof. Jan Ambjorn (Niels Bohr Institute & Radboud University)

Presentation materials

There are no materials yet.