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Can small-scale baryon inhomogeneities resolve the Hubble tension? An investigation with ACT DR4
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Small-scale inhomogeneities in the baryon density around recombination have been proposed as a solution to the tension between local and global determinations of the Hubble constant. These baryon clumping models make distinct predictions for the cosmic microwave background anisotropy power spectra on small angular scales. We use recent data from the Atacama Cosmology Telescope to test these predictions. No evidence for baryon clumping is found, assuming a range of parameterizations for time-independent baryon density probability distribution functions. The inferred Hubble constant remains in significant tension with the SH0ES measurement.
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Cited by 3 Pith papers
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Modified recombination and the Hubble tension
A selected modified recombination history fitted to Planck and DESI data raises the inferred Hubble constant to about 71 km/s/Mpc, reducing the SH0ES tension to below 2 sigma; a smooth four-parameter shape captures mu...
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Hubble tension: a short review of theoretical explanations
A comprehensive review finds no theoretical Hubble-tension solution yet passes all consistency tests; new early-dark-energy chains reach high H0 only when the SH0ES calibration is added.
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The Hubble tension: A decade review
Pure early or late fixes to the Hubble tension are tightly constrained; remaining options are combined early-late interacting dark energy or new physics at the local-to-homogeneous transition.
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