{"id":3842,"date":"2009-10-13T11:00:47","date_gmt":"2009-10-13T16:00:47","guid":{"rendered":"http:\/\/blogs.scienceforums.net\/swansont\/?p=3842"},"modified":"2009-10-13T11:00:47","modified_gmt":"2009-10-13T16:00:47","slug":"challenging-einstein","status":"publish","type":"post","link":"http:\/\/blogs.scienceforums.net\/swansont\/archives\/3842","title":{"rendered":"Challenging Einstein"},"content":{"rendered":"<p><a href=\"http:\/\/blogs.discovermagazine.com\/cosmicvariance\/2009\/10\/12\/a-new-challenge-to-einstein\/\">Cosmic Variance: A New Challenge to Einstein?<\/a><\/p>\n<blockquote><p>There is a straightforward way, in principle, to measure these two types of curvature. A slowly-moving object (like a planet moving around the Sun) is influenced by the curvature of time, but not by the curvature of space. (That sounds backwards, but keep in mind that \u201cslowly-moving\u201d is equivalent to \u201cmoves more through time than through space,\u201d so the curvature of time is more important.) But light, which moves as fast as you can, is pushed around equally by the two types of curvature. So all you have to do is, for example, compare the gravitational field felt by slowly-moving objects to that felt by a passing light ray. GR predicts that they should, in a well-defined sense, be the same.<\/p>\n<p>We\u2019ve done this in the Solar System, of course, and everything is fine. But it\u2019s always possible that some deviation from Einstein shows up at much larger distance and weaker gravitational fields than we have access to in our local neighborhood. That\u2019s basically what Rachel\u2019s paper does, considering different measures of the statistical properties of large-scale structure and comparing them to the predictions of a phenomenological model of the gravitational field. A crucial role is played by gravitational lensing, since that\u2019s where the deflection of light comes in.<\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>Cosmic Variance: A New Challenge to Einstein? There is a straightforward way, in principle, to measure these two types of curvature. A slowly-moving object (like a planet moving around the Sun) is influenced by the curvature of time, but not &hellip; <a href=\"http:\/\/blogs.scienceforums.net\/swansont\/archives\/3842\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[39],"tags":[],"class_list":["post-3842","post","type-post","status-publish","format-standard","hentry","category-physics"],"_links":{"self":[{"href":"http:\/\/blogs.scienceforums.net\/swansont\/wp-json\/wp\/v2\/posts\/3842","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/blogs.scienceforums.net\/swansont\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/blogs.scienceforums.net\/swansont\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/blogs.scienceforums.net\/swansont\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/blogs.scienceforums.net\/swansont\/wp-json\/wp\/v2\/comments?post=3842"}],"version-history":[{"count":0,"href":"http:\/\/blogs.scienceforums.net\/swansont\/wp-json\/wp\/v2\/posts\/3842\/revisions"}],"wp:attachment":[{"href":"http:\/\/blogs.scienceforums.net\/swansont\/wp-json\/wp\/v2\/media?parent=3842"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/blogs.scienceforums.net\/swansont\/wp-json\/wp\/v2\/categories?post=3842"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/blogs.scienceforums.net\/swansont\/wp-json\/wp\/v2\/tags?post=3842"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}