https://hackerpaper.kaipfister.de/p/1103.0007/Collected HN comments and submissions linking this paper.enMon, 02 Nov 2026 11:16:22 GMThttps://news.ycombinator.com/item?id=19538567urn:hackerpapers:mention:1103.0007:19538567Sun, 31 Mar 2019 21:35:23 GMT<p>As another commenter has noted, they wouldn&#x27;t then be galaxies. And the question of whether there are (or how common and at what mass) galaxyless dark matter overdensities (think of it as a clump, in the literature they are called &quot;halos&quot;) is still open. One of the problems with the current best model of the universe (Lambda CDM - a universe that is primarily make up of some cosmological constant driving expansion and cold dark matter whose gravity drives structure formation) is that it predicts that there should be far more of these dark matter overdensities than we see galaxies. This is the…</p><p><a href="https://hackerpaper.kaipfister.de/p/1103.0007/">Paper and discussion history</a>. A mention is not an endorsement.</p>astro-ph.CO