DESI 2024 VI: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations · HackerPapers discussions

DESI 2024 VI: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations — mentioned by suuuuuuuu

Sun, 23 Aug 2026 00:50:07 GMT

Domain expertise. (I would ask the same of you!) Fluids always have perturbations, except in the special case of w = -1 (cosmological constant); otherwise, dropping them violates energy-momentum conservation and gauge invariance. Here are a few excerpts from DESI: * https://arxiv.org/html/2404.03002v3#:~:text=Although%20a%20c... * https://arxiv.org/html/2404.03002v3#:~:text=Since%20the%20pa...

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DESI 2024 VI: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations — mentioned by negativelambda

Fri, 07 Nov 2025 03:13:21 GMT

It could be a big discovery and it also aligns with the findings from DESI BAO [1] and by another Korean group using galaxy clustering to infer the expansion history [2]. [1] https://arxiv.org/abs/2404.03002 [2] https://arxiv.org/abs/2305.00206

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DESI 2024 VI: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations — mentioned by jwuphysics

Sat, 06 Apr 2024 13:33:29 GMT

I am an astronomer and was at a conference when this headline broke. Obviously we ignored this and read the actual papers, e.g. https://arxiv.org/abs/2404.03002. There you can see that the dark energy equation of state parameter w0 = -0.99 +0.15/-0.13, which is not at all significantly different than w0 = -1. That is, no time evolving dark energy. When combined with other cosmological results, the joint analysis slightly favors w0 > -1 rather than w0 = -1 at the ~2.5sigma level or so, but it depends which other results you factor in.

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