https://hackerpaper.kaipfister.de/p/1611.01808/Collected HN comments and submissions linking this paper.enMon, 02 Nov 2026 11:16:22 GMThttps://news.ycombinator.com/item?id=35731192urn:hackerpapers:mention:1611.01808:35731192Thu, 27 Apr 2023 17:05:20 GMT<p>&gt; He mentioned something about negative mass, which is maybe the handwavium equivalent of anti-matter in science fiction? Well, anti-matter actually exists but its mass is positive. Also, the anti-particle of the (hypothetical) graviton is the graviton itself[0], so all in all nothing fancy happening there. &gt; Gravity only attracts. It never pushes away. Cosmic expansion would like to have a word. (Though, admittedly, expansion doesn&#x27;t happen in gravitationally bound systems, so from this point of view your statement is of course correct.) &gt; The one guy said the biggest problem with gravity is…</p><p><a href="https://hackerpaper.kaipfister.de/p/1611.01808/">Paper and discussion history</a>. A mention is not an endorsement.</p>math.DG