https://hackerpaper.kaipfister.de/p/1807.02059/Collected HN comments and submissions linking this paper.enMon, 02 Nov 2026 11:16:22 GMThttps://news.ycombinator.com/item?id=35726136urn:hackerpapers:mention:1807.02059:35726136Thu, 27 Apr 2023 10:51:54 GMT<p>Some reading on the universality of free fall version of the strong equivalent principle, tested in a manifestly relativistic regime: &quot;Even Phenomenally Dense Neutron Stars Fall like a Feather -- Einstein Gets It Right Again&quot; https://public.nrao.edu/news/neutron-stars-fall/ More detail, Archibald et al. 2018, &quot;Testing the universality of free fall by tracking a pulsar in a stellar triple system&quot; (Nature volume 559, pages 73--76 (2018)) preprint: &lt;https://arxiv.org/abs/1807.02059&gt;. If universality of free fall fails, so does the single metric / purely geometrical theory of General Relativity.…</p><p><a href="https://hackerpaper.kaipfister.de/p/1807.02059/">Paper and discussion history</a>. A mention is not an endorsement.</p>astro-ph.HEhttps://news.ycombinator.com/item?id=28922281urn:hackerpapers:mention:1807.02059:28922281Tue, 19 Oct 2021 19:11:57 GMT<p>This is a surprisingly good write-up. The Skordis &amp; Zlosnik paper can be found at https://arxiv.org/abs/2007.00082 I&#x27;ll start with some comments for non-experts, and then escalate about ten paragraphs further down. tl;dr: there are lots of things that hang on General Relativity being correct practically everywhere in our universe, the only &quot;hiding places&quot; that don&#x27;t break astrophysical objects (or even laboratory experiments, including in robotic laboratories we have sent to other places in our solar system) is very close to the big bang, deep inside black holes, and in large masses brought…</p><p><a href="https://hackerpaper.kaipfister.de/p/1807.02059/">Paper and discussion history</a>. A mention is not an endorsement.</p>astro-ph.HEhttps://news.ycombinator.com/item?id=28248415urn:hackerpapers:mention:1807.02059:28248415Fri, 20 Aug 2021 17:01:52 GMT<p>Pretty sure you know this, but for the benefit of other readers, extracting from the SEP we might more properly put this as, &quot;no-one can tell the difference between uniform acceleration and being at rest while immersed in a uniform gravitational field&quot;. A uniform gravitational field is not a feature of our universe, and especially not around our planet. More concretely, a necessary condition for a spacetime equipped with a uniform gravitational field is a constant https://en.wikipedia.org/wiki/Scalar_curvature . In sufficiently small (compared to galaxy clusters) patches of our universe we…</p><p><a href="https://hackerpaper.kaipfister.de/p/1807.02059/">Paper and discussion history</a>. A mention is not an endorsement.</p>astro-ph.HE