{"id":16107,"date":"2021-08-27T09:04:30","date_gmt":"2021-08-27T01:04:30","guid":{"rendered":"https:\/\/www.physics.nus.edu.sg\/?page_id=16107"},"modified":"2021-10-05T14:31:21","modified_gmt":"2021-10-05T06:31:21","slug":"colloquium-2021-sept-djordje-radicevic","status":"publish","type":"page","link":"https:\/\/www.physics.nus.edu.sg\/colloquium\/colloquium-2021-sept-djordje-radicevic\/","title":{"rendered":"colloquium-2021-sept-djordje-radicevic"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"16107\" class=\"elementor elementor-16107\" data-elementor-post-type=\"page\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-06fccc8 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"06fccc8\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-73a21e7\" data-id=\"73a21e7\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-256ffca elementor-widget elementor-widget-text-editor\" data-id=\"256ffca\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<h1 style=\"text-align: center;\">COLLOQUIUM 2021<\/h1>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-06e49c5 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"06e49c5\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-313b58a\" data-id=\"313b58a\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-f792b38 elementor-widget elementor-widget-text-editor\" data-id=\"f792b38\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<h2 align=\"center\">Translating between the two languages of quantum field theory<\/h2>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-ab318f8 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"ab318f8\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-4e3c0f1\" data-id=\"4e3c0f1\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-7ec9151 elementor-widget elementor-widget-text-editor\" data-id=\"7ec9151\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"table-responsive\"><table class=\"table table table-bordered\"><tbody><tr><td style=\"width: 20.8738%;\">Speaker<\/td><td style=\"width: 79.1262%;\"><strong>Djordje Radicevic<\/strong><br \/>Brandeis University, Waltham, Massachusetts, USA<\/td><\/tr><tr><td style=\"width: 20.8738%;\">Host<\/td><td style=\"width: 79.1262%;\">Lee Ching Hua<\/td><\/tr><tr><td style=\"width: 20.8738%;\">Date<\/td><td style=\"width: 79.1262%;\">Thu, 16 Sept @ 4.30 PM<\/td><\/tr><tr><td style=\"width: 20.8738%;\">Zoom registration link<\/td><td style=\"width: 79.1262%;\"><a href=\"https:\/\/nus-sg.zoom.us\/meeting\/register\/tZIsc-CurjIiHddUFeq88iimb2yNvDDaF49n\">https:\/\/nus-sg.zoom.us\/meeting\/register\/tZIsc-CurjIiHddUFeq88iimb2yNvDDaF49n<\/a><\/td><\/tr><\/tbody><\/table><\/div>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-9f4361a elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"9f4361a\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-fac1f26\" data-id=\"fac1f26\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-b4f767a elementor-widget elementor-widget-text-editor\" data-id=\"b4f767a\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<h4>Abstract<\/h4>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-6701e74 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"6701e74\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-1222070\" data-id=\"1222070\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-6ac1c0f elementor-widget elementor-widget-text-editor\" data-id=\"6ac1c0f\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>Quantum field theory (QFT) was originally developed as a set of rules describing elementary particles moving at relativistic speeds. It worked \u2014 often to unprecedented accuracy. QFT has since outgrown its initial remit and found uses in many areas of physics, mathematics, chemistry, and computer science. At its core, it is now a framework for studying systems with many degrees of freedom and finding simple, effective descriptions of their correlations, phase transitions, and other collective phenomena.<\/p><p>Perhaps surprisingly, theoretical physicists today use two fundamentally different approaches to QFT, much like two people may use different languages to describe the world. The continuum approach, based on analysis and differential geometry, is usually used in particle physics, string theory, and cosmology. The lattice approach, based on algebra and discrete mathematics, is more often seen in condensed matter, statistical mechanics, quantum information science, and in various numerical simulations. We know relatively little about the dictionary between the lattice and continuum &#8220;languages,&#8221; even though they can often describe the same physical phenomenon, such as the collision of two particles or the onset of superconductivity. In this talk I will describe a new and very general way to write such a dictionary. This formalizes decades of intuition, leads to long-sought mathematically rigorous definitions, and provides new insights into phase diagrams, dualities, and inherent limitations of well known examples of QFTs. Perhaps most importantly, this dictionary opens the door to realizing many QFTs as finite quantum systems that can be numerically or experimentally simulated.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-84c08da elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"84c08da\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-a51f5c0\" data-id=\"a51f5c0\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-c777730 elementor-widget elementor-widget-text-editor\" data-id=\"c777730\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<h4>References<\/h4><ol class=\"ol-listing\"><li>\u0110. Radi\u010devi\u0107, The Ultraviolet Structure of Quantum Field Theories. Part 1: Quantum Mechanics. arXiv:2105.11470<\/li><li>\u0110. Radi\u010devi\u0107, The Ultraviolet Structure of Quantum Field Theories. Part 2: What is Quantum Field Theory? arXiv:2105.12147<\/li><li>\u0110. Radi\u010devi\u0107, The Ultraviolet Structure of Quantum Field Theories. Part 3: Gauge Theories. arXiv:2105.12751<\/li><\/ol>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-2872988 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"2872988\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-97ff43b\" data-id=\"97ff43b\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-55d309d elementor-widget elementor-widget-text-editor\" data-id=\"55d309d\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<h4>Biography<\/h4>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-7eb8c77 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"7eb8c77\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-74a7d38\" data-id=\"74a7d38\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-d126386 elementor-widget elementor-widget-image\" data-id=\"d126386\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"640\" height=\"889\" src=\"https:\/\/www.physics.nus.edu.sg\/wp-content\/uploads\/sites\/5\/2021\/08\/Radicevic-Pic-1-737x1024.jpg\" class=\"attachment-large size-large wp-image-16121\" alt=\"\" srcset=\"https:\/\/www.physics.nus.edu.sg\/wp-content\/uploads\/sites\/5\/2021\/08\/Radicevic-Pic-1-737x1024.jpg 737w, https:\/\/www.physics.nus.edu.sg\/wp-content\/uploads\/sites\/5\/2021\/08\/Radicevic-Pic-1-216x300.jpg 216w, https:\/\/www.physics.nus.edu.sg\/wp-content\/uploads\/sites\/5\/2021\/08\/Radicevic-Pic-1-768x1066.jpg 768w, https:\/\/www.physics.nus.edu.sg\/wp-content\/uploads\/sites\/5\/2021\/08\/Radicevic-Pic-1-1106x1536.jpg 1106w, https:\/\/www.physics.nus.edu.sg\/wp-content\/uploads\/sites\/5\/2021\/08\/Radicevic-Pic-1-1475x2048.jpg 1475w, https:\/\/www.physics.nus.edu.sg\/wp-content\/uploads\/sites\/5\/2021\/08\/Radicevic-Pic-1-scaled.jpg 1843w\" sizes=\"(max-width: 640px) 100vw, 640px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-a61d015\" data-id=\"a61d015\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-0e5729b elementor-widget elementor-widget-text-editor\" data-id=\"0e5729b\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>Dr. Djordje Radicevic received a PhD in theoretical high energy physics from Stanford University in 2016 under the supervision of Profs. Herman Verlinde (Princeton) and Stephen Shenker (Stanford). From 2016 to 2019 he was a postdoctoral fellow at the Perimeter Institute for Theoretical Physics, and since 2019 he has been a Simons Foundation &#8220;It from Qubit&#8221; postdoctoral scholar based at Brandeis University.<\/p><p>Dr. Radicevic is broadly interested in fundamental aspects of quantum field theory, from its connections to basic mathematics and quantum gravity to its applications in condensed matter and quantum information science. His research aims to unify seemingly disparate ideas, theories, and disciplines. His doctoral work on Chern-Simons-matter dualities spearheaded a wave of joint high energy\/condensed matter research that to this day continues to shed new light on the quantum Hall effect and related strongly coupled phases of matter. His further work led to new mathematical systematizations of many known dualities as well as the derivation of new exact dualities, the most important being a powerful higher-dimensional generalization of the famous Jordan-Wigner transformation (joint work with Y.-A. Chen and A. Kapustin).<\/p><p>His current research efforts focus on the correspondence between lattice and continuum quantum field theories. His recent work provides a new, mathematically rigorous foundation of quantum field theory &#8212; an issue at the core of one of the Clay Mathematics Institute&#8217;s Millennium Problems &#8212; while at the same time showing how many well known quantum field theories may be precisely expressed as discrete, numerically simulable models.<\/p><p>In his free time, Djordje enjoys exploring new places, reading, learning languages, and playing\/solving\/occasionally creating various games and puzzles.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>COLLOQUIUM 2021 Translating between the two languages of quantum field theory Speaker Djordje RadicevicBrandeis University, Waltham, Massachusetts, USA Host Lee&#8230;<\/p>\n","protected":false},"author":77,"featured_media":0,"parent":15964,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-16107","page","type-page","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.physics.nus.edu.sg\/wp-json\/wp\/v2\/pages\/16107"}],"collection":[{"href":"https:\/\/www.physics.nus.edu.sg\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.physics.nus.edu.sg\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.physics.nus.edu.sg\/wp-json\/wp\/v2\/users\/77"}],"replies":[{"embeddable":true,"href":"https:\/\/www.physics.nus.edu.sg\/wp-json\/wp\/v2\/comments?post=16107"}],"version-history":[{"count":10,"href":"https:\/\/www.physics.nus.edu.sg\/wp-json\/wp\/v2\/pages\/16107\/revisions"}],"predecessor-version":[{"id":18608,"href":"https:\/\/www.physics.nus.edu.sg\/wp-json\/wp\/v2\/pages\/16107\/revisions\/18608"}],"up":[{"embeddable":true,"href":"https:\/\/www.physics.nus.edu.sg\/wp-json\/wp\/v2\/pages\/15964"}],"wp:attachment":[{"href":"https:\/\/www.physics.nus.edu.sg\/wp-json\/wp\/v2\/media?parent=16107"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}