Is there proof that backreaction of inhomogeneities is irrelevant in cosmology? · HackerPapers discussionshttps://hackerpaper.kaipfister.de/p/1505.07800/Collected HN comments and submissions linking this paper.enMon, 02 Nov 2026 11:16:22 GMTIs there proof that backreaction of inhomogeneities is irrelevant in cosmology? — mentioned by Certhashttps://news.ycombinator.com/item?id=21280103urn:hackerpapers:mention:1505.07800:21280103Thu, 17 Oct 2019 08:56:23 GMT<p>Hossenfelder is refering to the ongoing discussion in the physicist community on this topic. Some of the giants of the field (Wald, Ellis) semi-regularly exchange papers on this. It&#x27;s not a hunch. Green and Wald tried to proof that the inhomogeneities don&#x27;t matter, others disagree that they proofed anything of the sort. It&#x27;s a fairly robust debate, and I am not qualified to summarize the state of play. Here are some slides: https://cosmoback.sciencesconf.org/data/program/Ostrowski.pd... Edit: The rebuttal paper to Green-Wald from three years ago already has 100 citations...…</p><p><a href="https://hackerpaper.kaipfister.de/p/1505.07800/">Paper and discussion history</a>. A mention is not an endorsement.</p>gr-qc