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astro-ph.CO2026
Limits on the size of electron density fluctuations in the early universe and implications for the Hubble tension
Gabriel P. Lynch, Jens Chluba, Richard Battye +1
Little is known about the early universe on scales smaller than those resolved by the cosmic microwave background (CMB), where electron density fluctuations on kiloparsec to megapa…
astro-ph.CO2026
Improved frequency hierarchy treatment for anisotropic spectral distortions
Jens Chluba, Sara Evangelista, Tom Daman +1
Spectral distortion anisotropies of the cosmic microwave background (CMB) provide a new probe of the early Universe that can be accessed using traditional CMB imaging techniques. I…
astro-ph.CO2025
Ito calculus meets the Hubble tension: Effects of small-scale electron density fluctuations on the CMB anisotropies
Jens Chluba, Geoffrey Vasil, Richard Battye
In this work, we develop a novel formalism to include the effect of electron density fluctuations at ultra small scales (well below the sound horizon at last scattering) on the obs…