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Updated: Jul 31, 2025

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
Published on: August 12, 2013
What It Takes to Solve the Hubble Tension through Modifications of Cosmological Recombination
Nanoom Lee1, Yacine Ali-Haïmoud1, Nils Schöneberg2
1Center for Cosmology and Particle Physics, Department of Physics, New York University, New York, New York 10003, USA.
Abstract:
We construct data-driven solutions to the Hubble tension which are perturbative modifications to the fiducial ΛCDM cosmology, using the Fisher bias formalism. Taking as proof of principle the case of a time-varying electron mass and fine structure constant, and focusing first on Planck CMB data, 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.
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