Cosmology and Particle Physics seminar: The H0 world cup

09.10.2026 11:50 – 12:50

Over the past decade, local measurements of the present-day expansion rate of
the Universe, H0, have grown increasingly inconsistent with the value inferred
from cosmic microwave background observations under the assumption of LCDM. In
this talk, I will present the results of the “H0 World Cup”: a systematic
comparison of twelve representative solutions to the Hubble tension,
confronted with the latest cosmological data from Planck, ACT DR6, SPT-3G, and
DESI. The chosen models span a broad range of modifications to the standard
cosmological picture active at early- and late-times. Among the scenarios
considered, those involving an additional form of dark energy in the early
Universe are most strongly favored by current data. Finally, I will examine
the connection between solutions to the Hubble tension and recent indications
of evolving dark energy, and argue that resolving the former may offer an
alternative interpretation of the apparent “CMB–DESI tension.

Lieu

Bâtiment: Ecole de Physique

EP234

entrée libre