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:20260816T034239Z UID:Homotopy2026/1 DESCRIPTION:Title: Apllications of Homotopy Algebras in String Field Theory 1 \nby Ivo Sachs as part of Homotopy Algebraic Formulation of SFT\, QFT and IFT\n\nLecture held in 509 Math Bldg.\n\nAbstract\nIn the first lecture I will review the geometric origin of homotopy algebras and operads from the decomposition of the moduli space of world sheets in perturbative bosonic string field theory. In the second lecture I will use the reversed logic to formulate the construction of supper string field theory\, where the ge ometric decomposition of moduli space is not well understood. Finally\, I will address the issues of recovering a non-perturbative formulation of th e BV-action.\n LOCATION:https://master.researchseminars.org/talk/Homotopy2026/1/ END:VEVENT BEGIN:VEVENT SUMMARY:Yuji Okawa DTSTART:20260824T063000Z DTEND:20260824T073000Z DTSTAMP:20260816T034239Z UID:Homotopy2026/2 DESCRIPTION:Title: The large N limit of correlation functions from homotopy algeb ras\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://master.researchseminars.org/talk/Homotopy2026/2/ END:VEVENT BEGIN:VEVENT SUMMARY:Christian Saemann DTSTART:20260824T074500Z DTEND:20260824T084500Z DTSTAMP:20260816T034239Z UID:Homotopy2026/3 DESCRIPTION:Title: Higher connections and higher Chern-Simons theory\nby Chri stian Saemann as part of Homotopy Algebraic Formulation of SFT\, QFT and I FT\n\nLecture held in 509 Math Bldg.\n\nAbstract\nHigher connection form f ields describing a higher-dimensional parallel transport are ubiquitous in supergravity and string/M-theory. While the definition of higher principa l bundles is essentially straightforward\, the definition of the correspon ding higher connections and the action of bundle automorphisms or gauge tr ansformations on these features a surprising subtlety. I will explain this point in detail. and give a few examples of higher connections appearing in physics. I will then switch to higher Chern-Simons theory and discuss t he problems one faces there.\n LOCATION:https://master.researchseminars.org/talk/Homotopy2026/3/ END:VEVENT BEGIN:VEVENT SUMMARY:Ivo Sachs DTSTART:20260825T040000Z DTEND:20260825T050000Z DTSTAMP:20260816T034239Z UID:Homotopy2026/4 DESCRIPTION:Title: Apllications of Homotopy Algebras in String Field Theory 2 \nby Ivo Sachs as part of Homotopy Algebraic Formulation of SFT\, QFT and IFT\n\nLecture held in 509 Math Bldg.\n\nAbstract\nIn the first lecture I will review the geometric origin of homotopy algebras and operads from the decomposition of the moduli space of world sheets in perturbative bosonic string field theory. In the second lecture I will use the reversed logic to formulate the construction of supper string field theory\, where the ge ometric decomposition of moduli space is not well understood. Finally\, I will address the issues of recovering a non-perturbative formulation of th e BV-action.\n LOCATION:https://master.researchseminars.org/talk/Homotopy2026/4/ END:VEVENT BEGIN:VEVENT SUMMARY:Xianghang Zhang DTSTART:20260825T050000Z DTEND:20260825T060000Z DTSTAMP:20260816T034239Z UID:Homotopy2026/5 DESCRIPTION:Title: Localization of effective action in homtopy algebraic superstr ing field theory\nby Xianghang Zhang as part of Homotopy Algebraic For mulation of SFT\, QFT and IFT\n\nLecture held in 509 Math Bldg.\n\nAbstrac t\nWe will revisit the N=2 worldsheet supersymmetry localization mechanism of effective action in homotopy algebraic superstring field theory\, with out referring to Berkovits's WZW type action. We will also discuss the cas e of closed strings\, and possibility of going to higher orders.\nReferenc es: 1910.00538\, 2603.04953(a revised version will be uploaded soon)\n LOCATION:https://master.researchseminars.org/talk/Homotopy2026/5/ END:VEVENT BEGIN:VEVENT SUMMARY:Jojiro Totsuka DTSTART:20260825T063000Z DTEND:20260825T073000Z DTSTAMP:20260816T034239Z UID:Homotopy2026/6 DESCRIPTION:Title: Finite Gauge Symmetry and Cyclicity in L_\\infty Algebras: An Application to 4d Chern-Simons Theory\nby Jojiro Totsuka as part of Ho motopy Algebraic Formulation of SFT\, QFT and IFT\n\nLecture held in 509 M ath Bldg.\n\nAbstract\nL_\\infty algebras provide a useful framework for d escribing the algebraic structures underlying field theories\, particularl y gauge theories. They allow equations of motion\, actions\, gauge transfo rmations\, and their higher algebraic structures to be formulated in a uni fied manner. While infinitesimal gauge transformations have been studied e xtensively in this framework\, comparatively little is known about the gen eral formulation and properties of finite gauge transformations.\nIn this talk\, I will introduce an L_\\infty-algebraic formulation of finite gauge transformations and discuss some of their basic properties. In particular \, I will explain the central role played by cyclicity in ensuring the gau ge invariance of the action under finite gauge transformations. As an appl ication\, I will consider four-dimensional Chern-Simons theory. This theor y is known to be related to two-dimensional integrable scalar field theori es through a one-form known as the Lax connection. A master formula for th e action of the corresponding two-dimensional theory is also known. I will show that\, from the perspective of L_\\infty algebras\, this master form ula can be derived from finite gauge transformations and the associated br eaking of cyclicity.\n LOCATION:https://master.researchseminars.org/talk/Homotopy2026/6/ END:VEVENT BEGIN:VEVENT SUMMARY:Alexander Schenkel DTSTART:20260825T074500Z DTEND:20260825T084500Z DTSTAMP:20260816T034239Z UID:Homotopy2026/7 DESCRIPTION:Title: Homological algebra of integrable field theories in two and hi gher dimensions\nby Alexander Schenkel as part of Homotopy Algebraic F ormulation of SFT\, QFT and IFT\n\nLecture held in 509 Math Bldg.\n\nAbstr act\nIn this talk\, I will explain how the relationship between 2d integra ble field theories and 4d semi-holomorphic Chern-Simons theories discovere d by Costello and Yamazaki admits a rigorous and conceptually clean descri ption in terms of the homotopy theory of $L_\\infty$-algebras. In particul ar\, through a combination of techniques from complex geometry and homotop y transfer\, I will show how to extract from a semi-holomorphic Chern-Simo ns theory its associated integrable field theory and provide a novel persp ective on Lax connections in terms of $\\infty$-morphisms. I will conclude by illustrating how this framework scales to arbitrary dimensions and the reby provides some structural insights into the elusive topic of higher-di mensional integrability.\n\nThis talk is based on joint work with M. Benin i and B. Vicedo [arXiv:2601.19993] and with M. Benini\, R. Cullinan and B. Vicedo [arXiv:2604.24864].\n LOCATION:https://master.researchseminars.org/talk/Homotopy2026/7/ END:VEVENT BEGIN:VEVENT SUMMARY:Hiroshi Kunitomo DTSTART:20260826T040000Z DTEND:20260826T050000Z DTSTAMP:20260816T034239Z UID:Homotopy2026/8 DESCRIPTION:Title: A consistent light-cone-gauge superstring field theory\nby Hiroshi Kunitomo as part of Homotopy Algebraic Formulation of SFT\, QFT a nd IFT\n\nLecture held in 509 Math Bldg.\nAbstract: TBA\n LOCATION:https://master.researchseminars.org/talk/Homotopy2026/8/ END:VEVENT BEGIN:VEVENT SUMMARY:Keisuke Konosu DTSTART:20260826T050000Z DTEND:20260826T060000Z DTSTAMP:20260816T034239Z UID:Homotopy2026/9 DESCRIPTION:Title: Nonperturbative aspects of homotopy-algebraic approaches to co rrelation functions\nby Keisuke Konosu as part of Homotopy Algebraic F ormulation of SFT\, QFT and IFT\n\nLecture held in 509 Math Bldg.\n\nAbstr act\nHomotopy algebras such as $A_{\\infty}$ algebras and $L_{\\infty}$ al gebras are powerful tools for analyzing both quantum field theory and stri ng field theory.\nHowever\, most analyses for homotopy algebras remain per turbative. In this talk\, we discuss the possibility of extending these to ols for nonperturbative analysis. We focus on the analysis of correlation functions and present numerical evidence from zero-dimensional scalar fiel d theory. This talk is based on the work [JHEP 01 (2025) 152] and ongoing work with Yuji Okawa.\n LOCATION:https://master.researchseminars.org/talk/Homotopy2026/9/ END:VEVENT BEGIN:VEVENT SUMMARY:Hiroaki Matsunaga DTSTART:20260826T063000Z DTEND:20260826T073000Z DTSTAMP:20260816T034239Z UID:Homotopy2026/10 DESCRIPTION:Title: Canonical Commutation relations\, RLL relations\, and the Yan g-Baxter equation within the Batalin-Vilkovisky formalism\nby Hiroaki Matsunaga as part of Homotopy Algebraic Formulation of SFT\, QFT and IFT\n \nLecture held in 509 Math Bldg.\n\nAbstract\nThe Batalin-Vilkovisky (BV) formalism provides a powerful framework for describing various quantum fie ld theories. In this talk\, we revisit the foundation of the BV formalism using fundamental physical systems\, such as the harmonic oscillator. We w ill explain how canonical commutation relations can be derived from the BV quantization. Subsequently\, we introduce its connection to integrable sy stems\, outlining how key concepts such as the R-matrix\, the RLL relation \, and the Yang-Baxter equation appears.\n LOCATION:https://master.researchseminars.org/talk/Homotopy2026/10/ END:VEVENT END:VCALENDAR