Spectroxide is a publicly available code package that evolves the photon Boltzmann equation from z ~ 5e6 to today to calculate CMB spectral distortions caused by heat or photon injection, with all code and tests generated by AI under human supervision and validated against analytic limits and prior
The synergy between CMB spectral distortions and anisotropies
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Mixing electromagnetic radiation with dark radiation between BBN and recombination dilutes the baryon-to-entropy ratio, tightening the allowed total extra radiation to at most ~25% more than dark-radiation-only scenarios.
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Constraints on the Injection of Radiation in the Early Universe
Mixing electromagnetic radiation with dark radiation between BBN and recombination dilutes the baryon-to-entropy ratio, tightening the allowed total extra radiation to at most ~25% more than dark-radiation-only scenarios.