Speaker
Nanoom Lee
Description
We develop a formalism exploring the existence of a data-driven solution to the Hubble tension, considering perturbative modifications around a fiducial $\Lambda$CDM cosmology. Taking as proof-of-principle the case of a time-varying electron mass and fine structure constant, we demonstrate that a modified recombination can solve the Hubble tension and lower $S_8$ to match weak lensing measurements. Once baryonic acoustic oscillation and uncalibrated supernovae data are included, however, it is not possible to fully solve the tension with perturbative modifications to recombination.
Authors
Nanoom Lee
Nils Schöneberg
(ICC University Barcelona)
Dr
Vivian Poulin
(LUPM, CNRS & U. de Montpellier, France)
Yacine Ali-Haimoud
(New York University)
