{"id":4140,"date":"2024-05-19T18:37:46","date_gmt":"2024-05-19T18:37:46","guid":{"rendered":"http:\/\/alanrolsky.site\/?p=4140"},"modified":"2024-05-19T18:37:46","modified_gmt":"2024-05-19T18:37:46","slug":"keine-haare","status":"publish","type":"post","link":"https:\/\/mx-dilo.red\/?p=4140","title":{"rendered":"keine Haare*"},"content":{"rendered":"\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p>&#8220;But then one may come to appreciate this result after all. It means that, given any closed surface, we can represent all that happens inside it by degrees of freedom on this surface itself. This, one may argue, suggests that quantum gravity should be described entirely by a topological quantum field theory, in which all physical degrees of freedom<br>can be projected onto the boundary. One Boolean variable per Planckian surface element should suffice.&#8221;**<\/p>\n\n\n\n<p><em>\u00b4t Hooft<\/em> hat im Jahre 1993 einen, wie er sagt, Essay** zu Ehren von Abdus Salam geschrieben, dem Mitbegr\u00fcnder des Standardmodells der Teilchenphysik und der Vereinheitlichung der Beschreibung der Ph\u00e4nomene. Diesem Essay folgte dann sieben Jahre sp\u00e4ter das Paper <em>The Holographic Principle<\/em>***, eine absolut bemerkenswerter, phantastischer Ansatz, gr\u00fcndend auf dem Essay, der deutlich macht, wie und wieviel wir von <em>black holes<\/em> \u00fcber den Kosmos lernen k\u00f6nnen.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-video aligncenter\"><video controls src=\"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/transcoded\/1\/1d\/A_Black_Hole%E2%80%99s_Dinner_is_Fast_Approaching_-_Part_2.ogv\/A_Black_Hole%E2%80%99s_Dinner_is_Fast_Approaching_-_Part_2.ogv.360p.vp9.webm\"><\/video><figcaption class=\"wp-element-caption\"><em>dinner, or just supper<\/em><\/figcaption><\/figure>\n\n\n\n<p>Das faszinierende an dem Essay sind die spekulativen <em>bits and pieces<\/em>, die man als W\u00fcrdigung, als Geschenk an A. Salam verstehen darf, daher auch die Characterisierung als Essay, was diesen Freiheitsgrad bietet. Der Begriff <em>Dimensional Reduction<\/em> wird hier bereits in den Zusammenhang mit einem Hologramm gebracht : &#8220;The situation can be compared with a hologram of a three dimensional image on a two-dimensional surface. &#8221; Wie sagt <em>\u00b4t Hooft<\/em> einleitend :&#8221;I am given the opportunity to contemplate some very deep questions concerning the ultimate unification..&#8221; <em>`t Hooft<\/em> erhielt 1999 den Nobelpreis f\u00fcr Arbeiten im Zusammenhang mit Regularisierung und Renormierung von Eichtheorien (QED)****.<\/p>\n<\/div>\n<\/div>\n\n\n\n<p><em>*J. Wheeler, &#8220;ein schwarzes Loch hat keine Haare&#8221; ;  ** <a href=\"https:\/\/arxiv.org\/pdf\/gr-qc\/9310026\">Dimensional Reduction in Quantum Gravity<\/a>, G. &#8216;t Hooft, Utrecht, Spinoza Institute, 1993; ***<\/em><a href=\"https:\/\/arxiv.org\/pdf\/hep-th\/0003004\">The Holographic Principle<\/a>, <em>**** G. &#8216;t Hooft, M. Veltman; <a href=\"https:\/\/doi.org\/10.1016\/0550-3213(72)90279-9\">Regularization and renormalization of gauge fields<\/a>, Nuclear Physics B, Volume 44, Issue 1, 1972<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>&#8220;But then one may come to appreciate this result after all. It means that, given any closed surface, we can represent all that happens inside it by degrees&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,1],"tags":[],"class_list":["post-4140","post","type-post","status-publish","format-standard","hentry","category-physics","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/mx-dilo.red\/index.php?rest_route=\/wp\/v2\/posts\/4140","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mx-dilo.red\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mx-dilo.red\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mx-dilo.red\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mx-dilo.red\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4140"}],"version-history":[{"count":0,"href":"https:\/\/mx-dilo.red\/index.php?rest_route=\/wp\/v2\/posts\/4140\/revisions"}],"wp:attachment":[{"href":"https:\/\/mx-dilo.red\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4140"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mx-dilo.red\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4140"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mx-dilo.red\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4140"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}