HERA Power-Spectrum Limits and the Allowed Delay in Lyman-alpha Coupling
Year: 2026
Type: article
Abstract: Interferometric limits from HERA on the 21-cm power spectrum at cosmic dawn already exclude the coldest, most strongly fluctuating scenarios in some redshift ranges. Using the stated cosmology and the brightness-temperature relations described in the Methods, the calculation gives the following headline values: z couple = 17.5; delay z = 2.5; power upper mK2 = 730; model power mK2 = 315. The comparison values taken from the published record — including the EDGES and SARAS reports, HERA limits and the Planck optical depth where relevant — are used exactly as published, and the bounce contribution enters only through the named timing, heating or shear inputs. The result is a computed prediction for the delayed-onset history, with its sensitivity to each input stated in the Discussion. This study is simulated and computed from stated assumptions; it is not a measurement.
Author: Aldred, William Alexander
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7225803387
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