{"id":12934,"date":"2016-11-11T10:46:47","date_gmt":"2016-11-11T18:46:47","guid":{"rendered":"http:\/\/www.preposterousuniverse.com\/blog\/?p=12934"},"modified":"2016-11-11T10:47:25","modified_gmt":"2016-11-11T18:47:25","slug":"talking-about-dark-matter-and-dark-energy","status":"publish","type":"post","link":"https:\/\/preposterousuniverse.com\/blog\/2016\/11\/11\/talking-about-dark-matter-and-dark-energy\/","title":{"rendered":"Talking About Dark Matter and Dark Energy"},"content":{"rendered":"<p>Trying to keep these occasional Facebook Live videos going. (I&#8217;ve looked briefly into other venues such as Periscope, but FB is really easy and anyone can view without logging in if they like.) <\/p>\n<p>So <a href=\"https:\/\/www.facebook.com\/seanmcarrollauthor\/videos\/1236421353095130\/\">here<\/a> is one I did this morning, about why cosmologists think dark matter and dark energy are things that really exist. I talk in particular about a recent paper by <a href=\"https:\/\/arxiv.org\/abs\/1506.01354\">Nielsen, Guffanti, and Sarkar<\/a> that questioned the evidence for universal acceleration (I think the evidence is still very good), and one by <a href=\"https:\/\/arxiv.org\/abs\/1611.02269\">Erik Verlinde<\/a> suggesting that emergent gravity can modify Einstein&#8217;s general relativity on large scales to explain away dark matter (I think it&#8217;s an intriguing idea, but am skeptical it can ever fit the data from the cosmic microwave background).<\/p>\n<p><iframe loading=\"lazy\" src=\"https:\/\/www.facebook.com\/plugins\/video.php?href=https%3A%2F%2Fwww.facebook.com%2Fseanmcarrollauthor%2Fvideos%2F1236421353095130%2F&#038;show_text=0&#038;width=560\" width=\"560\" height=\"315\" style=\"border:none;overflow:hidden\" scrolling=\"no\" frameborder=\"0\" allowTransparency=\"true\" allowFullScreen=\"true\"><\/iframe><\/p>\n<p>Feel free to propose topics for future conversations, or make suggestions about the format.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Trying to keep these occasional Facebook Live videos going. (I&#8217;ve looked briefly into other venues such as Periscope, but FB is really easy and anyone can view without logging in if they like.) So here is one I did this morning, about why cosmologists think dark matter and dark energy are things that really exist. [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[28],"tags":[],"class_list":["post-12934","post","type-post","status-publish","format-standard","hentry","category-science"],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/preposterousuniverse.com\/blog\/wp-json\/wp\/v2\/posts\/12934","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/preposterousuniverse.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/preposterousuniverse.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/preposterousuniverse.com\/blog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/preposterousuniverse.com\/blog\/wp-json\/wp\/v2\/comments?post=12934"}],"version-history":[{"count":3,"href":"https:\/\/preposterousuniverse.com\/blog\/wp-json\/wp\/v2\/posts\/12934\/revisions"}],"predecessor-version":[{"id":12937,"href":"https:\/\/preposterousuniverse.com\/blog\/wp-json\/wp\/v2\/posts\/12934\/revisions\/12937"}],"wp:attachment":[{"href":"https:\/\/preposterousuniverse.com\/blog\/wp-json\/wp\/v2\/media?parent=12934"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/preposterousuniverse.com\/blog\/wp-json\/wp\/v2\/categories?post=12934"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/preposterousuniverse.com\/blog\/wp-json\/wp\/v2\/tags?post=12934"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}