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DTSTART;TZID=America/New_York:20230609T100000
DTEND;TZID=America/New_York:20230609T113000
DTSTAMP:20260406T184406
CREATED:20230802T171314Z
LAST-MODIFIED:20240215T111159Z
UID:10001180-1686304800-1686310200@cmsa.fas.harvard.edu
SUMMARY:Classification of Self-Dual Vertex Operator Superalgebras of Central Charge at Most 24
DESCRIPTION:Quantum Matter Seminar \nSpeakers: Gerald Höhn (Kansas State University) & Sven Möller (University of Hamburg) \nTitle: Classification of Self-Dual Vertex Operator Superalgebras of Central Charge at Most 24 \nAbstract: We discuss the classfication of self-dual vertex operator superalgebras (SVOAs) of central charge 24\, or in physics parlance the purely chiral 2-dimensional fermionic conformal field theories with just one primary field. \nThere are exactly 969 such SVOAs under suitable regularity assumptions and the assumption that the shorter moonshine module VB^# is the unique self-dual SVOA of central charge 23.5 whose weight-1/2 and weight-1 spaces vanish. \nWe construct and classify the self-dual SVOAs by determining the 2-neighbourhood graph of the self-dual (purely bosonic) VOAs of central charge 24 and also by realising them as simple-current extensions of a dual pair containing a certain maximal lattice VOA. We show that all SVOAs besides VB^# x F and potential fake copies thereof stem from elements of the Conway group Co_0\, the automorphism group of the Leech lattice. \nBy splitting off free fermions F\, if possible\, we obtain the classification for all central charges less than or equal to 24.\nReference: G. Höhn\, S. Möller\, arXiv:2303.17190.
URL:https://cmsa.fas.harvard.edu/event/qm_6923/
LOCATION:Virtual
CATEGORIES:Quantum Matter
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-QMMP-06.09.23.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20230613T100000
DTEND;TZID=America/New_York:20230613T120000
DTSTAMP:20260406T184406
CREATED:20230802T171505Z
LAST-MODIFIED:20240228T070233Z
UID:10001181-1686650400-1686657600@cmsa.fas.harvard.edu
SUMMARY:Small Bosonic CFTs\, Chiral Fermionization\, and Symmetry/Subalgebra Duality
DESCRIPTION:Quantum Matter Seminar \nSpeaker: Brandon C. Rayhaun (C. N. Yang ITP\, Stony Brook University) \nTitle: Small Bosonic CFTs\, Chiral Fermionization\, and Symmetry/Subalgebra Duality \nAbstract: Conformal field theories in (1+1)D are key actors in many dramas of physics and mathematics. Their classification has therefore been an important and long-standing problem. In this talk\, I will explain the main ideas behind the classification of (most) “small” bosonic CFTs. Here\, I use the adjective “small” informally to refer to theories with low central charge (less than 24) and few primary operators (less than 5). Time and attention permitting\, I will highlight two applications of this result. First\, I will describe how it can be used in tandem with bosonization and fermionization techniques to establish the classification of chiral fermionic CFTs with central charge less than 23. Second\, I will showcase how it can be used to bootstrap generalized global symmetries using the concept of “symmetry/subalgebra duality.” \nTalk based on arXiv:2208.05486 [hep-th] (joint work with Sunil Mukhi) and arXiv:2303.16921 [hep-th]. \n \n 
URL:https://cmsa.fas.harvard.edu/event/qm_61323/
LOCATION:Virtual
CATEGORIES:Quantum Matter
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-QMMP-06.13.23.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20230626T100000
DTEND;TZID=America/New_York:20230626T113000
DTSTAMP:20260406T184406
CREATED:20230802T171648Z
LAST-MODIFIED:20240110T073717Z
UID:10001182-1687773600-1687779000@cmsa.fas.harvard.edu
SUMMARY:Chiral fermionic CFTs of central charge ≤ 16
DESCRIPTION:Quantum Matter Seminar \nTitle: Chiral fermionic CFTs of central charge ≤ 16 \nAbstract: We classified all chiral fermionic CFTs of central charge ≤ 16 using Kac’s theorem and bosonization/fermionization. This talk will discuss the derivation of this result\, its application to the classification of non-supersymmetric heterotic string theories\, and along the way we’ll address some oft-overlooked subtleties of bosonization from the point of view of anomalies and topological phases.
URL:https://cmsa.fas.harvard.edu/event/qm_62623/
LOCATION:Virtual
CATEGORIES:Quantum Matter
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-QMMP-06.26.23.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20230630T100000
DTEND;TZID=America/New_York:20230630T113000
DTSTAMP:20260406T184406
CREATED:20230802T171855Z
LAST-MODIFIED:20240110T074010Z
UID:10001183-1688119200-1688124600@cmsa.fas.harvard.edu
SUMMARY:Monopoles\, Scattering\, and Generalized Symmetries
DESCRIPTION:Quantum Matter Seminar \nSpeaker: Marieke Van Beest (SCGP) \nTitle: Monopoles\, Scattering\, and Generalized Symmetries \nAbstract: In this talk\, we will discuss the problem of electrically charged\, massless fermions scattering off magnetic monopoles. The interpretation of the outgoing states has long been a puzzle\, as they can carry fractional quantum numbers. We argue that such outgoing particles live in the twisted sector of a topological co-dimension 1 surface\, which ends topologically on the monopole. This symmetry defect is often non-invertible\, and as such the outgoing radiation not only carries unconventional flavor quantum numbers\, but is often trailed by a topological field theory\, which is a new prediction.
URL:https://cmsa.fas.harvard.edu/event/qm_63023/
LOCATION:Virtual
CATEGORIES:Quantum Matter
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-QMMP-06.30.23.png
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