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Title: Extended TQFT
Abstract: This talk is the continuation of my TQFT discussion from last week. I am going to discuss the extended TQFT as an open-closed strings following the nice paper by Aaron D. Lauda, Hendryk Pfeiffer "Open-closed strings: Two-dimensional extended TQFTs and Frobenius algebras". After that I am going to discuss 2-categories approach and compare it with asymptotic symmetries and edge modes.
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QG group meeting.
Speaker: Yasha Neiman
Title: "Boundary locality vs. higher-spin symmetry"
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Our new Deigo Cluster is coming! Learn all about the migration, and ask us any questions you may have.
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Title: Strings from Massive Higher Spins: The Asymptotic Uniqueness of the Veneziano Amplitude
Abstract: We are going to discuss the recent paper by Simon Caron-Huot, Zohar Komargodski, Amit Sever and Alexander Zhiboedov "Strings from Massive Higher Spins: The Asymptotic Uniqueness of the Veneziano Amplitude". Dorian Weissman will be leading the discussion.
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TQM unit is holding a Zoom seminar.
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Title : TQFT and Asymptotic symmetries
Speaker: Vyacheslav Lysov
Abstract: I will provide an introduction to topological quantum field theories (TQFT) and their generalization - Extended TQFT. Using the TQFT framework I am going to discuss the behaviour of Hilbert spaces, associated to the boundary components, under the gluing.
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This session will represent an introduction to several more advanced topological topics that are important in different branches of mathematics and physics.
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We will discuss algebraic properties of knot surgery diagrams that turn out to be useful tools to simplify the description of a three manifod.
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We will focus this lecture on the concept of homology and its relation to the handle decomposition of manifolds.
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I will review the structure of the fermionic Z2xZ2 orbifolds that produced a large space of phenomenological three generation models. I will discuss the trial and error old school method that gave rise to the first known string derived MSSM models, as well as the more modern classification methods that enables the analysis of large spaces of vacua and extraction of some of the global properties underlying them, e.g. spinor--vector duality. I will discuss a new direction of research that was initiated over the past year. Since the mid-eighties it is known that in addition to the ten dimensional tachyon free heterotic-string vacua there exist tachyonic ten dimensional vacua. In the supersymmetric and non-supersymmetric tachyon free cases the ten dimensional tachyon are projected out by the same projection. I will discuss the construction of phenomenological tachyon free models starting from the tachyonic 10D vacua and their particular features.