{"id":189152,"date":"2024-05-11T11:27:33","date_gmt":"2024-05-11T16:27:33","guid":{"rendered":"https:\/\/lifeboat.com\/blog\/2024\/05\/how-do-we-know-how-much-dark-matter-there-is-in-the-universe"},"modified":"2024-05-11T11:27:33","modified_gmt":"2024-05-11T16:27:33","slug":"how-do-we-know-how-much-dark-matter-there-is-in-the-universe","status":"publish","type":"post","link":"https:\/\/lifeboat.com\/blog\/2024\/05\/how-do-we-know-how-much-dark-matter-there-is-in-the-universe","title":{"rendered":"How do we know how much dark matter there is in the Universe?"},"content":{"rendered":"<p><\/p>\n<p><iframe style=\"display: block; margin: 0 auto; width: 100%; aspect-ratio: 4\/3; object-fit: contain;\" src=\"https:\/\/www.youtube.com\/embed\/AKa0Wcq86vE?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope;\n   picture-in-picture\" allowfullscreen><\/iframe><\/p>\n<p>AD \u2014 Go to <a href=\"https:\/\/ground.news\/drbecky\">https:\/\/ground.news\/drbecky<\/a> to stay fully informed with the latest Space and Science news. Subscribe through my link to get 40% off the Vantage plan for unlimited access this month only. | I often get asked how do we know dark matter exists? Which is why I\u2019ve made a video on all the observational evidence we have before (linked below)! But occasionally I\u2019ll get asked how do we know how much dark matter there is, which is a really fun question. There\u2019s many different ways we can calculate this, including the ratio between normal (baryonic) and dark matter, but in this video I just wanted to highlight three different ways astrophysicists calculate this.<\/p>\n<p>Here\u2019s my previous video on all the evidence we have for dark matter \u2014 \u2022 All the evidence we have for dark mat\u2026<br \/> My previous video on whether dark matter could be made of black holes \u2014 \u2022 Is dark matter made of black holes?<br \/> My previous video on whether black holes contain dark matter \u2014 \u2022 Do black holes contain dark matter?<br \/> My previous video on why galaxies merge if the universe is expanding \u2014 \u2022 If the Universe is expanding, then wh\u2026<\/p>\n<p>Allen, Evrard \\&amp; Mantz (2011; review on galaxy clusters observations) \u2014 <a href=\"https:\/\/arxiv.org\/pdf\/1103.4829\">https:\/\/arxiv.org\/pdf\/1103.4829<\/a><br \/> Zwicky (1933; first virial theorem paper in German) \u2014 <a href=\"https:\/\/articles.adsabs.harvard.edu\/p\">https:\/\/articles.adsabs.harvard.edu\/p<\/a>\u2026<br \/> Zwicky (1937; virial theorem applied to the Coma cluster) \u2014 <a href=\"https:\/\/articles.adsabs.harvard.edu\/p\">https:\/\/articles.adsabs.harvard.edu\/p<\/a>\u2026<br \/> Alpher, Bethe, \\&amp; Gamow (1948; big bang nucleosynthesis; behind paywall) \u2014 <a href=\"https:\/\/journals.aps.org\/pr\/abstract\/.\">https:\/\/journals.aps.org\/pr\/abstract\/.<\/a>\u2026<br \/> Alpher \\&amp; Herman (1950; more BBN work; behind paywall) \u2014 <a href=\"https:\/\/journals.aps.org\/rmp\/abstract\">https:\/\/journals.aps.org\/rmp\/abstract<\/a>\u2026<br \/> Planck collaboration (2015; cosmological parameter results for our best model of the Universe) \u2014 <a href=\"https:\/\/arxiv.org\/pdf\/1502\">https:\/\/arxiv.org\/pdf\/1502<\/a>.<\/p>\n<p>00:00 Introduction.<br \/> 02:04 Ground News AD<br \/> 03:54 Method 1 \u2014 Galaxy Clusters and the virial theorem.<br \/> 08:49 Method 2 \u2014 Big Bang Nucleosynthesis.<br \/> 11:39 Method 3 \u2014 Cosmic Microwave Background.<br \/> 14:35 Outro.<br \/> 15:24 Bloopers.<\/p>\n<p>Video filmed on a Sony \u237a7 IV<\/p>\n<p>\ud83c\udfa7 Royal Astronomical Society Podcast that I co-host: <a href=\"http:\/\/podfollow.com\/supermassive.\">podfollow.com\/supermassive.<\/a><\/p>\n<div class=\"more-link-wrapper\"> <a class=\"more-link\" href=\"https:\/\/lifeboat.com\/blog\/2024\/05\/how-do-we-know-how-much-dark-matter-there-is-in-the-universe\">Continue reading \u201cHow do we know how much dark matter there is in the Universe?\u201d | &gt;<\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>AD \u2014 Go to https:\/\/ground.news\/drbecky to stay fully informed with the latest Space and Science news. Subscribe through my link to get 40% off the Vantage plan for unlimited access this month only. | I often get asked how do we know dark matter exists? Which is why I\u2019ve made a video on all the [\u2026]<\/p>\n","protected":false},"author":661,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[33,219],"tags":[],"class_list":["post-189152","post","type-post","status-publish","format-standard","hentry","category-cosmology","category-physics"],"_links":{"self":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts\/189152","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/users\/661"}],"replies":[{"embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/comments?post=189152"}],"version-history":[{"count":0,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts\/189152\/revisions"}],"wp:attachment":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/media?parent=189152"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/categories?post=189152"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/tags?post=189152"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}