Cosmic Microwave Background Spectral Distortion Limits on Primordial Black Holes
Year: 2026
Type: article
Abstract: Before the cosmic microwave background was released at recombination, the universe was an almost perfect blackbody machine, but not quite a perfect one. Energy injected into the photon bath at redshifts between about two million and fifty thousand cannot fully thermalise; it leaves a characteristic chemical-potential distortion of the spectrum, and later injections leave a Compton-y distortion instead. The headline computed values are: strongest finite f = 1.84e-04. The study is a computation from stated assumptions, not a measurement, and the deposited script reproduces every number quoted.
Author: Aldred, William Alexander
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7225775232
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