{"id":930008,"date":"2023-02-27T07:05:32","date_gmt":"2023-02-27T07:05:32","guid":{"rendered":"https:\/\/projects.ift.uam-csic.es\/holotube\/?p=930008"},"modified":"2023-02-28T15:03:56","modified_gmt":"2023-02-28T15:03:56","slug":"february-28-zero-sound-and-higher-form-symmetries-in-compressible-holographic-phases-by-eric-mefford","status":"publish","type":"post","link":"https:\/\/projects.ift.uam-csic.es\/holotube\/2023\/02\/27\/february-28-zero-sound-and-higher-form-symmetries-in-compressible-holographic-phases-by-eric-mefford\/","title":{"rendered":"February 28: “Zero sound and higher-form symmetries in compressible holographic phases” by Eric Mefford"},"content":{"rendered":"\n
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Date : February 28, 2023, 16:00 CET<\/strong> <\/p>\n\n\n\n

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Eric Mefford<\/strong><\/strong> (University of Victoria)<\/p>\n<\/div><\/div>\n\n\n\n

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

Zero sound and higher-form symmetries in compressible holographic phases<\/strong><\/p>\n\n\n\n

Abstract: <\/strong> Certain holographic states of matter with a global U(1) symmetry support a sound mode at zero temperature, caused neither by spontaneous symmetry breaking of the global U(1) nor by the emergence of a Fermi surface in the infrared. In this talk, I will present recent work that illustrates that such a mode is also found in zero density holographic quantum critical states. I will argue that the appearance of a zero temperature sound mode is the consequence of a mixed \u2018t Hooft anomaly between the global U(1) symmetry and an emergent higher-form symmetry. At non-zero temperatures, the presence of a black hole horizon weakly breaks the emergent symmetry and gaps the collective mode, giving rise to a sharp Drude-like peak in the electric conductivity. Time permitting, I will present evidence that the same physics emerges in certain finite density holographic quantum critical states at low temperatures.<\/p>\n<\/div><\/div>\n\n\n\n