{"id":330,"date":"2008-03-25T00:27:59","date_gmt":"2008-03-25T05:27:59","guid":{"rendered":"http:\/\/arxivblog.com\/?p=330"},"modified":"2008-03-25T14:27:08","modified_gmt":"2008-03-25T19:27:08","slug":"how-hawking-radiation-may-explain-dark-energy","status":"publish","type":"post","link":"http:\/\/arxivblog.com\/?p=330","title":{"rendered":"How Hawking radiation may explain dark energy"},"content":{"rendered":"<p><a href=\"http:\/\/arxivblog.com\/wp-content\/uploads\/2008\/03\/dark-hawking-energy.jpg\" title=\"Dark Hawking Energy\"><img decoding=\"async\" src=\"http:\/\/arxivblog.com\/wp-content\/uploads\/2008\/03\/dark-hawking-energy.thumbnail.jpg\" alt=\"Dark Hawking Energy\" \/><\/a><\/p>\n<p>In 1993, the Dutch Nobel prize-winning physicist Gerard t&#8217;Hooft suggested that all the information in a region of space can be represented as a hologram, an idea that implies that the laws of physics that govern our universe are somehow encoded on its (higher dimensional) boundary.<\/p>\n<p>This idea, known as the holographic principle, has a certain elegance and so has received widespread attention from some theorists although nobody knowns whether it is a true description of the universe or not.<\/p>\n<p>If it is true, Jae-Weon Lee from the Korea Institute for Advanced Study in Seoul and some pals, say that this boundary should emit Hawking radiation.<\/p>\n<p>Hawking originally dreamt up this radiation idea to describe a process that might occur near the event horizon of a black hole. When pairs of virtual particles pop into existence (as they do all over the universe), they normally annihilate each other and disappear again. But near a black hole, one of these particles can cross the event horizon while the other makes its escape and this gives the impression that the black hole is emiting radiation.<\/p>\n<p>Lee&#8217;s team say a similar thing may happen at the holographic boundary and that the energy this creates might be responsible for making the expansion of the universe accelerate.<\/p>\n<p>They also explain why this radiation does not interact with ordinary matter and so is not seen in other ways: it&#8217;s wavelength, being universe-sized, is too long.<\/p>\n<p>Seems as good an explanation as any other at this stage, after all the competition is ideas like quintessence, k-essence and quintoms.<\/p>\n<p>Two things though: if this radiation exerts a force, why would it act to accelerate the expansion of the universe and not decelerate it? Lee and co are not convincing on this point.  And, I wonder whether t&#8217;Hooft, who has some exotic ideas of his own about quantum determinism, would say that this kind of cosmic Hawking radiation is not compatible with the holographic principle and therefore bunkum.<\/p>\n<p>Ref: <a href=\"http:\/\/arxiv.org\/abs\/0803.1987\">arxiv.org\/abs\/0803.1987<\/a>: Is Dark Energy from Cosmic Hawking radiation?<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In 1993, the Dutch Nobel prize-winning physicist Gerard t&#8217;Hooft suggested that all the information in a region of space can be represented as a hologram, an idea that implies that the laws of physics that govern our universe are somehow encoded on its (higher dimensional) boundary. This idea, known as the holographic principle, has a [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14,6,7],"tags":[],"class_list":["post-330","post","type-post","status-publish","format-standard","hentry","category-at-the-seaside","category-hellraisin","category-stars-in-their-eyes"],"_links":{"self":[{"href":"http:\/\/arxivblog.com\/index.php?rest_route=\/wp\/v2\/posts\/330","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/arxivblog.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/arxivblog.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/arxivblog.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/arxivblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=330"}],"version-history":[{"count":0,"href":"http:\/\/arxivblog.com\/index.php?rest_route=\/wp\/v2\/posts\/330\/revisions"}],"wp:attachment":[{"href":"http:\/\/arxivblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=330"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/arxivblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=330"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/arxivblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=330"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}