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DTSTART;TZID=America/New_York:20241004T090000
DTEND;TZID=America/New_York:20241004T103000
DTSTAMP:20260505T220952
CREATED:20240907T190416Z
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SUMMARY:Holography and Regge Phases at Large U(1) Charge
DESCRIPTION:Quantum Field Theory and Physical Mathematics Seminar \nSpeaker: Giulia Fardelli\, Boston University \nTitle: Holography and Regge Phases at Large U(1) Charge \nAbstract: A single Conformal Field Theory (CFT) can have a rich phase diagram with qualitatively different emergent behaviors in a range of different regimes parameterized by the conserved charges of the theory. In this talk\, I will consider a CFT with a global U(1) current and explore the phase diagram as a function of the U(1) charge Q and angular momentum J\, particularly at large J and Q. By taking the large J limit first\, we are able to employ a dual holographic interpretation in AdS_{d+1} to predict the energy spectrum of Q-particle states. This limit has been studied in detail for Q=2\, yielding very general results applicable to unitary CFTs in d>2. When Q is also taken to be large\, the description is more complicated; nevertheless\, we can draw interesting conclusions about the energy spectrum under certain assumptions. I will conclude with a concrete example\, the O(2) model in 3d\, highlighting interesting connections with recent (and less recent) results in this context. \n 
URL:https://cmsa.fas.harvard.edu/event/qm_10424/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Quantum Field Theory and Physical Mathematics
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-QFT-and-Physical-Mathematics-10.4.2024.png
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20241011T090000
DTEND;TZID=America/New_York:20241011T100000
DTSTAMP:20260505T220952
CREATED:20240912T173151Z
LAST-MODIFIED:20241003T205732Z
UID:10003505-1728637200-1728640800@cmsa.fas.harvard.edu
SUMMARY:Dolbeault Virasoro algebra and M5 branes
DESCRIPTION:Quantum Field Theory and Physical Mathematics Seminar \nSpeaker: Brian Williams\, Boston University \nTitle: Dolbeault Virasoro algebra and M5 branes \nAbstract: The worldvolume theory on a stack of M5 branes in M-theory is superconformal. We propose a conjecture that in the holomorphic twist of the theory on a stack of M5 branes an infinite-dimensional enhancement of the (twisted) superconformal algebra is a symmetry. This algebra is closely related to the exceptional infinite-dimensional Lie superalgebra called E(3|6). We show that under the usual AGT correspondence this enhanced algebra degenerates to the Virasoro algebra at a particular central charge.
URL:https://cmsa.fas.harvard.edu/event/qm_101124/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Quantum Field Theory and Physical Mathematics,Quantum Matter
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-QFT-and-Physical-Mathematics-10.11.2024.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20241018T090000
DTEND;TZID=America/New_York:20241018T100000
DTSTAMP:20260505T220952
CREATED:20240907T193958Z
LAST-MODIFIED:20241015T143755Z
UID:10003468-1729242000-1729245600@cmsa.fas.harvard.edu
SUMMARY:Bosonic and fermionic 1-form symmetries and anomaly matching
DESCRIPTION:Quantum Field Theory and Physical Mathematics Seminar \n*via Zoom only* \nSpeaker: Rajath Radhakrishnan (ICTP\, Trieste) \nTitle: Bosonic and fermionic 1-form symmetries and anomaly matching \nAbstract: In this talk\, I will consider bosonic and fermionic (non-invertible) 1-form symmetries in 2+1d QFTs. These are 1-form symmetries implemented by topological line operators with real spins. I will present a classification of topological quantum field theories in which all line operators have real topological spins\, and use this framework to classify the anomalies associated with these 1-form symmetries. Additionally\, I will discuss the anomaly matching condition for these symmetries under an RG flow. I will illustrate this condition in concrete examples.
URL:https://cmsa.fas.harvard.edu/event/qm_101824/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Quantum Field Theory and Physical Mathematics
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-QFT-10.18.2024.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20241025T090000
DTEND;TZID=America/New_York:20241025T103000
DTSTAMP:20260505T220952
CREATED:20240907T194046Z
LAST-MODIFIED:20241018T221702Z
UID:10003469-1729846800-1729852200@cmsa.fas.harvard.edu
SUMMARY:The spin-statistics theorem for TFTs
DESCRIPTION:Quantum Field Theory and Physical Mathematics Seminar \nSpeaker: Luuk Stehouwer\, Dalhousie University \nTitle: The spin-statistics theorem for TFTs \nAbstract: In quantum field theory (QFT) the spin-statistics theorem says that in a unitary QFT\, a particle has half-integer spin if and only if it is a fermion. I show how to phrase this statement in the language of functorial field theories. More precisely\, I explain when a functorial field theory “has fermions” and “has spinors” and when they are “related”. I will then restrict to topological field theories (TFTs) and define unitary TFTs. There are counterexamples of the spin-statistics theorem for non-unitary TFTs. I will prove that every unitary TFT satisfies the spin-statistics theorem. \n  \n  \n 
URL:https://cmsa.fas.harvard.edu/event/qm_102524/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Quantum Field Theory and Physical Mathematics
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-QFT-and-Physical-Mathematics-10.25.2024.png
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