{"id":306232,"date":"2021-06-10T15:09:33","date_gmt":"2021-06-10T15:09:33","guid":{"rendered":"https:\/\/projects.ift.uam-csic.es\/holotube\/?p=306232"},"modified":"2021-06-28T23:47:12","modified_gmt":"2021-06-28T23:47:12","slug":"june-22-1600-cest-by-nabil-iqbal","status":"publish","type":"post","link":"https:\/\/projects.ift.uam-csic.es\/holotube\/2021\/06\/10\/june-22-1600-cest-by-nabil-iqbal\/","title":{"rendered":"June 22: \u201cMean string field theory\u201d by Nabil Iqbal"},"content":{"rendered":"\n
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Date : June 22, 2021, 16:00 CEST<\/strong><\/p>\n\n\n\n

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Nabil Iqbal\u202c <\/strong>(Durham University)<\/p>\n<\/div><\/div>\n\n\n\n

Link:<\/strong> https:\/\/zoom.us\/j\/98260147834?pwd=VW5BQStqUGUrUFFzWG1jL2tuWXJoZz09<\/a><\/p>\n\n\n\n

Title:<\/strong> Mean string field theory<\/p>\n\n\n\n

Abstract<\/strong>:  Just as conventional global symmetries result in a conserved particle number, higher-form global symmetries are associated with a conserved density of higher dimensional objects, such as strings or branes. Many well-known systems possess such symmetries. I will present an overview of the applications of such symmetries and discuss the prospect of using them to enlarge the usual Landau classification of the phases of matter. I will then describe the construction of a continuum Landau-Ginzburg theory to describe the spontaneous breaking of a higher-form symmetry. As the order parameter is an operator that creates a string, the framework can be thought of as a kind of “mean string field theory” that provides a non-perturbative description where effective strings can be created and destroyed. I will argue that many aspects of higher form symmetries \u2014 including the phase structure, the behavior of line operators, and the dynamics of Goldstone modes \u2014 can be transparently understood in this framework. <\/p>\n<\/div><\/div>\n\n\n\n

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