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DTSTART;TZID=America/New_York:20221024T090000
DTEND;TZID=America/New_York:20221024T103000
DTSTAMP:20260411T135346
CREATED:20240214T114116Z
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SUMMARY:Insulating BECs and other surprises in dipole-conserving systems
DESCRIPTION:Quantum Matter Seminar \nSpeaker: Ethan Lake (MIT) \nTitle: Insulating BECs and other surprises in dipole-conserving systems \nAbstract: I will discuss recent work on bosonic models whose dynamics conserves both total charge and total dipole moment\, a situation which can be engineered in strongly tilted optical lattices. Related models have received significant attention recently for their interesting out-of-equilibrium dynamics\, but analytic and numeric studies reveal that they also possess rather unusual ground states. I will focus in particular on a dipole-conserving variant of the Bose-Hubbard model\, which realizes an unusual phase of matter that possesses a Bose-Einstein condensate\, but which is nevertheless insulating\, and has zero superfluid weight. Time permitting\, I will also describe the physics of a regime in which these models spontaneously fracture into an exotic type of glassy state. \n 
URL:https://cmsa.fas.harvard.edu/event/qm_102422/
LOCATION:Virtual
CATEGORIES:Quantum Matter
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Quantum-Matter-in-Mathematics-and-Physics-10.24.22.png
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DTSTART;TZID=America/New_York:20221024T110000
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DTSTAMP:20260411T135346
CREATED:20230730T183559Z
LAST-MODIFIED:20240110T045511Z
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SUMMARY:Anomalies of Discrete Gauge Symmetries and their Cancellation in 6D F-theory
DESCRIPTION:Swampland Seminar \nSpeaker: Paul-Konstantin Oehlmann(Northeastern) \nTitle: Anomalies of Discrete Gauge Symmetries and their Cancellation in 6D F-theory \nAbstract: We consider 6D SUGRAs with a discrete gauge group G\, engineered via F-theory compactifications on genus-one fibered threefolds. We argue that group G suffers from Dai-Freed anomalies that can be canceled via a discrete Green-Schwarz mechanism. We comment on the ambiguity to assign this GS term in the 7D Anomaly theory which leads to choices that are not all compatible with F-theory. \nIn F-theory we then deduce this Anomaly coefficient explicitly by computing the elliptic genera of the non-critical strings that couple to the 6D two-form fields: Their 2D worldsheet theories inherits a G Flavor symmetries whose t’Hooft anomaly cancels the 6D Dai-Freed anomaly in the bulk via inflow. This talk is based on work in preparation together with Markus Dierigl and Thorsten Schimmanek.
URL:https://cmsa.fas.harvard.edu/event/swampland_102422/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Swampland Seminar
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