BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Ivo Sachs DTSTART:20260824T050000Z DTEND:20260824T060000Z DTSTAMP:20260825T012420Z UID:Homotopy2026/1 DESCRIPTION:Title: Apllications of Homotopy Algebras in String Field Theory 1\nby Iv o Sachs as part of Homotopy Algebraic Formulation of SFT\, QFT and IFT\n\n Lecture held in 509 Math Bldg.\n\nAbstract\nIn the first lecture I will re view the geometric origin of homotopy algebras and operads from the decomp osition of the moduli space of world sheets in perturbative bosonic string field theory. In the second lecture I will use the reversed logic to form ulate the construction of supper string field theory\, where the geometric decomposition of moduli space is not well understood. Finally\, I will ad dress the issues of recovering a non-perturbative formulation of the BV-ac tion.\n LOCATION:https://researchseminars.org/talk/Homotopy2026/1/ END:VEVENT BEGIN:VEVENT SUMMARY:Yuji Okawa DTSTART:20260824T063000Z DTEND:20260824T073000Z DTSTAMP:20260825T012420Z UID:Homotopy2026/2 DESCRIPTION:Title: The large N limit of correlation functions from homotopy algebras \nby Yuji Okawa as part of Homotopy Algebraic Formulation of SFT\, QFT and IFT\n\nLecture held in 509 Math Bldg.\nAbstract: TBA\n LOCATION:https://researchseminars.org/talk/Homotopy2026/2/ END:VEVENT BEGIN:VEVENT SUMMARY:Christian Saemann DTSTART:20260824T074500Z DTEND:20260824T084500Z DTSTAMP:20260825T012420Z UID:Homotopy2026/3 DESCRIPTION:Title: Higher connections and higher Chern-Simons theory\nby Christian S aemann as part of Homotopy Algebraic Formulation of SFT\, QFT and IFT\n\nL ecture held in 509 Math Bldg.\n\nAbstract\nHigher connection form fields d escribing a higher-dimensional parallel transport are ubiquitous in superg ravity and string/M-theory. While the definition of higher principal bundl es is essentially straightforward\, the definition of the corresponding hi gher connections and the action of bundle automorphisms or gauge transform ations on these features a surprising subtlety. I will explain this point in detail. and give a few examples of higher connections appearing in phys ics. I will then switch to higher Chern-Simons theory and discuss the prob lems one faces there.\n LOCATION:https://researchseminars.org/talk/Homotopy2026/3/ END:VEVENT BEGIN:VEVENT SUMMARY:Ivo Sachs DTSTART:20260825T040000Z DTEND:20260825T050000Z DTSTAMP:20260825T012420Z UID:Homotopy2026/4 DESCRIPTION:Title: Apllications of Homotopy Algebras in String Field Theory 2\nby Iv o Sachs as part of Homotopy Algebraic Formulation of SFT\, QFT and IFT\n\n Lecture held in 509 Math Bldg.\n\nAbstract\nIn the first lecture I will re view the geometric origin of homotopy algebras and operads from the decomp osition of the moduli space of world sheets in perturbative bosonic string field theory. In the second lecture I will use the reversed logic to form ulate the construction of supper string field theory\, where the geometric decomposition of moduli space is not well understood. Finally\, I will ad dress the issues of recovering a non-perturbative formulation of the BV-ac tion.\n LOCATION:https://researchseminars.org/talk/Homotopy2026/4/ END:VEVENT BEGIN:VEVENT SUMMARY:Xianghang Zhang DTSTART:20260825T050000Z DTEND:20260825T060000Z DTSTAMP:20260825T012420Z UID:Homotopy2026/5 DESCRIPTION:Title: Localization of effective action in homtopy algebraic superstring fie ld theory\nby Xianghang Zhang as part of Homotopy Algebraic Formulatio n of SFT\, QFT and IFT\n\nLecture held in 509 Math Bldg.\n\nAbstract\nWe w ill revisit the N=2 worldsheet supersymmetry localization mechanism of eff ective action in homotopy algebraic superstring field theory\, without ref erring to Berkovits's WZW type action. We will also discuss the case of cl osed strings\, and possibility of going to higher orders.\nReferences: 191 0.00538\, 2603.04953(a revised version will be uploaded soon)\n LOCATION:https://researchseminars.org/talk/Homotopy2026/5/ END:VEVENT BEGIN:VEVENT SUMMARY:Jojiro Totsuka DTSTART:20260825T063000Z DTEND:20260825T073000Z DTSTAMP:20260825T012420Z UID:Homotopy2026/6 DESCRIPTION:Title: Finite Gauge Symmetry and Cyclicity in L_\\infty Algebras: An Applica tion to 4d Chern-Simons Theory\nby Jojiro Totsuka as part of Homotopy Algebraic Formulation of SFT\, QFT and IFT\n\nLecture held in 509 Math Bld g.\n\nAbstract\nL_\\infty algebras provide a useful framework for describi ng the algebraic structures underlying field theories\, particularly gauge theories. They allow equations of motion\, actions\, gauge transformation s\, and their higher algebraic structures to be formulated in a unified ma nner. While infinitesimal gauge transformations have been studied extensiv ely in this framework\, comparatively little is known about the general fo rmulation and properties of finite gauge transformations.\nIn this talk\, I will introduce an L_\\infty-algebraic formulation of finite gauge transf ormations and discuss some of their basic properties. In particular\, I wi ll explain the central role played by cyclicity in ensuring the gauge inva riance of the action under finite gauge transformations. As an application \, I will consider four-dimensional Chern-Simons theory. This theory is kn own to be related to two-dimensional integrable scalar field theories thro ugh a one-form known as the Lax connection. A master formula for the actio n of the corresponding two-dimensional theory is also known. I will show t hat\, from the perspective of L_\\infty algebras\, this master formula can be derived from finite gauge transformations and the associated breaking of cyclicity.\n LOCATION:https://researchseminars.org/talk/Homotopy2026/6/ END:VEVENT BEGIN:VEVENT SUMMARY:Alexander Schenkel DTSTART:20260825T074500Z DTEND:20260825T084500Z DTSTAMP:20260825T012420Z UID:Homotopy2026/7 DESCRIPTION:Title: Homological algebra of integrable field theories in two and higher di mensions\nby Alexander Schenkel as part of Homotopy Algebraic Formulat ion of SFT\, QFT and IFT\n\nLecture held in 509 Math Bldg.\n\nAbstract\nIn this talk\, I will explain how the relationship between 2d integrable fie ld theories and 4d semi-holomorphic Chern-Simons theories discovered by Co stello and Yamazaki admits a rigorous and conceptually clean description i n terms of the homotopy theory of $L_\\infty$-algebras. In particular\, th rough a combination of techniques from complex geometry and homotopy trans fer\, I will show how to extract from a semi-holomorphic Chern-Simons theo ry its associated integrable field theory and provide a novel perspective on Lax connections in terms of $\\infty$-morphisms. I will conclude by ill ustrating how this framework scales to arbitrary dimensions and thereby pr ovides some structural insights into the elusive topic of higher-dimension al integrability.\n\nThis talk is based on joint work with M. Benini and B . Vicedo [arXiv:2601.19993] and with M. Benini\, R. Cullinan and B. Vicedo [arXiv:2604.24864].\n LOCATION:https://researchseminars.org/talk/Homotopy2026/7/ END:VEVENT BEGIN:VEVENT SUMMARY:Hiroshi Kunitomo DTSTART:20260826T040000Z DTEND:20260826T050000Z DTSTAMP:20260825T012420Z UID:Homotopy2026/8 DESCRIPTION:Title: A consistent light-cone-gauge superstring field theory\nby Hirosh i Kunitomo as part of Homotopy Algebraic Formulation of SFT\, QFT and IFT\ n\nLecture held in 509 Math Bldg.\nAbstract: TBA\n LOCATION:https://researchseminars.org/talk/Homotopy2026/8/ END:VEVENT BEGIN:VEVENT SUMMARY:Keisuke Konosu DTSTART:20260826T050000Z DTEND:20260826T060000Z DTSTAMP:20260825T012420Z UID:Homotopy2026/9 DESCRIPTION:Title: Nonperturbative aspects of homotopy-algebraic approaches to correlati on functions\nby Keisuke Konosu as part of Homotopy Algebraic Formulat ion of SFT\, QFT and IFT\n\nLecture held in 509 Math Bldg.\n\nAbstract\nHo motopy algebras such as $A_{\\infty}$ algebras and $L_{\\infty}$ algebras are powerful tools for analyzing both quantum field theory and string fiel d theory.\nHowever\, most analyses for homotopy algebras remain perturbati ve. In this talk\, we discuss the possibility of extending these tools for nonperturbative analysis. We focus on the analysis of correlation functio ns and present numerical evidence from zero-dimensional scalar field theor y. This talk is based on the work [JHEP 01 (2025) 152] and ongoing work wi th Yuji Okawa.\n LOCATION:https://researchseminars.org/talk/Homotopy2026/9/ END:VEVENT BEGIN:VEVENT SUMMARY:Hiroaki Matsunaga DTSTART:20260826T063000Z DTEND:20260826T073000Z DTSTAMP:20260825T012420Z UID:Homotopy2026/10 DESCRIPTION:Title: Canonical Commutation relations\, RLL relations\, and the Yang-Baxte r equation within the Batalin-Vilkovisky formalism\nby Hiroaki Matsuna ga as part of Homotopy Algebraic Formulation of SFT\, QFT and IFT\n\nLectu re held in 509 Math Bldg.\n\nAbstract\nThe Batalin-Vilkovisky (BV) formali sm provides a powerful framework for describing various quantum field theo ries. In this talk\, we revisit the foundation of the BV formalism using f undamental physical systems\, such as the harmonic oscillator. We will exp lain how canonical commutation relations can be derived from the BV quanti zation. Subsequently\, we introduce its connection to integrable systems\, outlining how key concepts such as the R-matrix\, the RLL relation\, and the Yang-Baxter equation appears.\n LOCATION:https://researchseminars.org/talk/Homotopy2026/10/ END:VEVENT END:VCALENDAR