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From Scratch: A Direct Test of the Sound-Horizon Assumption

We evaluate the sound horizon at photon decoupling using only late-time observations and the directly measured acoustic angle from the CMB. The goal is to determine how much of the sound horizon can be recovered from data alone, without assuming any specific early-universe model. The analysis ...
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researchsquare.com broke the news in on Thursday, January 8, 2026.
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