https://hackerpaper.kaipfister.de/p/2210.10833/Collected HN comments and submissions linking this paper.enMon, 02 Nov 2026 11:16:22 GMThttps://news.ycombinator.com/item?id=42158612urn:hackerpapers:mention:2210.10833:42158612Sat, 16 Nov 2024 19:35:08 GMT<p>Not an expert, just trying to add some more context. With time-delay cosmography[1] one exploits that unless the source is perfectly in the center of the line of sight, then the photons that make up one lensed copy have traveled a different distance from the source than photons that make up a different lensed copy. This effect can be used to measure absolute distance and give an accurate measure of the Hubble constant. With dual source-plane lensing[2] one exploits that if two different sources lensed by the same lens, one can take the ratio of the measurements between the two sources and get…</p><p><a href="https://hackerpaper.kaipfister.de/p/2210.10833/">Paper and discussion history</a>. A mention is not an endorsement.</p>astro-ph.CO