{"id":253,"date":"2020-04-20T10:23:21","date_gmt":"2020-04-20T10:23:21","guid":{"rendered":"https:\/\/projects.ift.uam-csic.es\/holotube\/?p=253"},"modified":"2020-11-12T15:04:01","modified_gmt":"2020-11-12T15:04:01","slug":"14th-of-july-superluminal-chaos-after-a-quantum-quench-by-kevin-nguyen","status":"publish","type":"post","link":"https:\/\/projects.ift.uam-csic.es\/holotube\/2020\/04\/20\/14th-of-july-superluminal-chaos-after-a-quantum-quench-by-kevin-nguyen\/","title":{"rendered":"21th of July: \u201dSuperluminal chaos after a quantum quench\u201d by K\u00e9vin Nguyen"},"content":{"rendered":"\n<p><strong>Date : 21th of July 2020, 16:00 CET<\/strong><\/p>\n\n\n\n<p><strong>K\u00e9vin Nguyen<\/strong>&nbsp;(Harvard)<\/p>\n\n\n\n<p><strong>Link:<\/strong>&nbsp;<strong><a href=\"https:\/\/us02web.zoom.us\/j\/82834697825?pwd=OUltMDJ5TWgwOVZUWmU2RzA1VmgxUT09\">https:\/\/us02web.zoom.us\/j\/82834697825?pwd=OUltMDJ5TWgwOVZUWmU2RzA1VmgxUT09<\/a><\/strong><\/p>\n\n\n\n<p><strong>Title:<\/strong>&nbsp;<strong>Superluminal chaos after a quantum quench<\/strong><\/p>\n\n\n\n<p><strong>Abstract<\/strong>:&nbsp;I will present a formula to compute out-of-time-order correlators (OTOC) in generic asymptotically AdS spacetimes, based on the geodesic approximation to bulk propagators and the exchange of gravitational shock waves. In contrast to the standard method of Shenker and Stanford, this formula does not require to work in Fourier space and is therefore better suited when considering time-dependent holographic states. Applying this new method to the computation of OTOCs in quenched states dual to collapsing thin shells of matter (Vaidya spacetimes), we discover a transient superluminality in the butterfly velocity characterizing information scrambling in the system.<\/p>\n\n\n\n<figure class=\"wp-block-embed-youtube wp-block-embed is-type-video is-provider-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\"  style=\"display: block; margin: 0px auto;\"  id=\"_ytid_18443\"  width=\"1170\" height=\"658\"  data-origwidth=\"1170\" data-origheight=\"658\" src=\"https:\/\/www.youtube.com\/embed\/q5NlDpcNy44?enablejsapi=1&#038;autoplay=0&#038;cc_load_policy=0&#038;cc_lang_pref=&#038;iv_load_policy=1&#038;loop=0&#038;rel=1&#038;fs=1&#038;playsinline=0&#038;autohide=2&#038;theme=dark&#038;color=red&#038;controls=1&#038;\" class=\"__youtube_prefs__  epyt-is-override  no-lazyload\" title=\"YouTube player\"  allow=\"fullscreen; accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen data-no-lazy=\"1\" data-skipgform_ajax_framebjll=\"\"><\/iframe>\n<\/div><\/figure>\n\n\n\n<div class=\"wp-block-file\"><a href=\"https:\/\/projects.ift.uam-csic.es\/holotube\/wp-content\/uploads\/2020\/07\/SuperluminalChaos_holotube.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">Slides<\/a><a href=\"https:\/\/projects.ift.uam-csic.es\/holotube\/wp-content\/uploads\/2020\/07\/SuperluminalChaos_holotube.pdf\" class=\"wp-block-file__button\" download>Download<\/a><\/div>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Date : 21th of July 2020, 16:00 CET K\u00e9vin Nguyen&nbsp;(Harvard) Link:&nbsp;https:\/\/us02web.zoom.us\/j\/82834697825?pwd=OUltMDJ5TWgwOVZUWmU2RzA1VmgxUT09 Title:&nbsp;Superluminal chaos after a quantum quench Abstract:&nbsp;I will present a formula to compute out-of-time-order correlators (OTOC) in generic asymptotically AdS spacetimes, based on the geodesic approximation to bulk propagators and the exchange of gravitational shock waves. In contrast to the standard method of Shenker [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-253","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/projects.ift.uam-csic.es\/holotube\/wp-json\/wp\/v2\/posts\/253","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/projects.ift.uam-csic.es\/holotube\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/projects.ift.uam-csic.es\/holotube\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/projects.ift.uam-csic.es\/holotube\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/projects.ift.uam-csic.es\/holotube\/wp-json\/wp\/v2\/comments?post=253"}],"version-history":[{"count":7,"href":"https:\/\/projects.ift.uam-csic.es\/holotube\/wp-json\/wp\/v2\/posts\/253\/revisions"}],"predecessor-version":[{"id":67574,"href":"https:\/\/projects.ift.uam-csic.es\/holotube\/wp-json\/wp\/v2\/posts\/253\/revisions\/67574"}],"wp:attachment":[{"href":"https:\/\/projects.ift.uam-csic.es\/holotube\/wp-json\/wp\/v2\/media?parent=253"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/projects.ift.uam-csic.es\/holotube\/wp-json\/wp\/v2\/categories?post=253"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/projects.ift.uam-csic.es\/holotube\/wp-json\/wp\/v2\/tags?post=253"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}