BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Gabriel Cuomo (Princeton U. & New York U.) DTSTART:20250520T130000Z DTEND:20250520T140000Z DTSTAMP:20260422T230723Z UID:QTFMS/1 DESCRIPTION:Title: Th e Large Charge Sector of CFTs\nby Gabriel Cuomo (Princeton U. & New Yo rk U.) as part of Quantum Theories of Fields\, Matter\, and Strings\n\nAbs tract: TBA\n LOCATION:https://researchseminars.org/talk/QTFMS/1/ END:VEVENT BEGIN:VEVENT SUMMARY:Alessandro Tomasiello (University of Milano-Bicocca) DTSTART:20250527T130000Z DTEND:20250527T140000Z DTSTAMP:20260422T230723Z UID:QTFMS/2 DESCRIPTION:Title: De fects in 6d SCFTs Leading to 4d N=1 Models\nby Alessandro Tomasiello ( University of Milano-Bicocca) as part of Quantum Theories of Fields\, Matt er\, and Strings\n\n\nAbstract\nMany superconformal field theories in four dimensions can be obtained by compactifying parent 6D theories on Riemann surfaces. Using holography in massive IIA string theory\, I will provide evidence that a large class of such models can be enriched by punctures\, generalizing the so-called Class S construction.\n\nTo get the Zoom link y o can either fill out the following form or contact the organizer: https:/ /docs.google.com/forms/d/1KmOdB7a8Z3vH9mRJsPT9pr0Ej0Qj7dMI9I1JKEEiYzI/view form?edit_requested=true\n LOCATION:https://researchseminars.org/talk/QTFMS/2/ END:VEVENT BEGIN:VEVENT SUMMARY:Markus Dierigl (CERN) DTSTART:20250602T130000Z DTEND:20250602T140000Z DTSTAMP:20260422T230723Z UID:QTFMS/3 DESCRIPTION:Title: Ex ploring Utopia\nby Markus Dierigl (CERN) as part of Quantum Theories o f Fields\, Matter\, and Strings\n\n\nAbstract\nIn this talk we will explor e different topological charges of supergravity theories supported by a no n-trivial U-duality bundle. In case these charges would be conserved\, the y would lead to global symmetries\, which we believe to be absent in any c onsistent theory of quantum gravity. With the UV completions of string and M-theory at hand we explore\, which kind of UV objects are necessary to b reak all global symmetries in the IR supergravity theory. This leads to in teresting string backgrounds including higher-dimensional superconformal f ield theories\, twisted compactifications\, and non-geometric defects.\n LOCATION:https://researchseminars.org/talk/QTFMS/3/ END:VEVENT BEGIN:VEVENT SUMMARY:Anatoly Dymarsky (University of Kentucky) DTSTART:20250612T130000Z DTEND:20250612T140000Z DTSTAMP:20260422T230723Z UID:QTFMS/4 DESCRIPTION:Title: Su bsystem Entropy in 2d CFT and the Diagonal Approximation\nby Anatoly D ymarsky (University of Kentucky) as part of Quantum Theories of Fields\, M atter\, and Strings\n\n\nAbstract\nEntanglement entropy is a key quantity in quantum many-body physics\, yet its computation remains challenging out side of special cases. In this talk\, I will present a method based on the diagonal approximation\, rooted in the subsystem Eigenstate Thermalizatio n Hypothesis (ETH)\, for evaluating the entanglement entropy of excited st ates and thermal ensembles in the large-subsystem limit. Applying this fra mework to two-dimensional conformal field theories (2D CFTs)\, we show tha t it reproduces known results for canonical and microcanonical ensembles a nd individual primary states\, while also yielding new predictions for KdV generalized Gibbs ensembles. Our approach resolves tensions between expli cit CFT computations and ETH expectations\, providing indirect support for the generalized ETH in 2D CFTs.\n LOCATION:https://researchseminars.org/talk/QTFMS/4/ END:VEVENT BEGIN:VEVENT SUMMARY:F. Nur Ünal (University of Cambridge & University of Birmingham) DTSTART:20250627T130000Z DTEND:20250627T140000Z DTSTAMP:20260422T230723Z UID:QTFMS/5 DESCRIPTION:Title: To pology and Obstruction in Multi-level Systems\nby F. Nur Ünal (Univer sity of Cambridge & University of Birmingham) as part of Quantum Theories of Fields\, Matter\, and Strings\n\n\nAbstract\nWhile the landscape of fre e-fermion topological phases has drastically been expanded in the last dec ades\, recently novel multi-gap topological phases have been discovered wi th non-Abelian braiding properties of band singularities. In systems with C2T or PT symmetry\, the ability of these band nodes to annihilate pairwis e is path dependent\, and the sign of their charges can be changed by brai ding nodes in adjacent gaps. I will present non-Abelian frame charges asso ciated with band nodes and discuss their observable signatures. I will tal k about the effects of the non-Bravais lattice configuration and obstructi on on the multi-gap topological Euler invariant\, illustrate physical sign atures of these non-trivial Brillouin zone boundary conditions.\n\nPRL 133 \, 093404 (2024)\; Nat Comm 15\, 1144 (2024)\; PRL 125\, 053601 (2020)\; Alsaiari et al\, to appear (2025)\n LOCATION:https://researchseminars.org/talk/QTFMS/5/ END:VEVENT BEGIN:VEVENT SUMMARY:Xingyang Yu (Virginia Tech) DTSTART:20250619T130000Z DTEND:20250619T140000Z DTSTAMP:20260422T230723Z UID:QTFMS/6 DESCRIPTION:Title: No n-invertible Symmetries via Subfactors: Conformal and Topological Applicat ions\nby Xingyang Yu (Virginia Tech) as part of Quantum Theories of Fi elds\, Matter\, and Strings\n\n\nAbstract\nNon-invertible symmetries\, cha racterized by fusion categories rather than groups\, play a central role i n modern quantum field theory and topological phases of matter. In this ta lk\, I will introduce a von Neumann subfactor approach to non-invertible s ymmetries in two dimensions. Subfactors encode fusion categorical data—i ncluding symmetries\, module categories\, and dual symmetries—via their bipartite principal graphs. I will explain how these structures naturally encode generalized gaugings and dualities\, and illustrate their physical implications in both conformal and topological settings. In particular\, I will discuss new self-dualities in $c=1$ CFTs\, such as the exceptional o rbifold $SU(2)_1/A_5$\, and present a classification of particle-soliton d egeneracies in gapped phases with various non-invertible symmetries. This framework provides a concrete computational toolkit that bridges subfactor theory and physical non-invertible symmetries.\n LOCATION:https://researchseminars.org/talk/QTFMS/6/ END:VEVENT BEGIN:VEVENT SUMMARY:Alfred Shapere (University of Kentucky) DTSTART:20250722T130000Z DTEND:20250722T140000Z DTSTAMP:20260422T230723Z UID:QTFMS/7 DESCRIPTION:Title: Ho lography of Free Fields\nby Alfred Shapere (University of Kentucky) as part of Quantum Theories of Fields\, Matter\, and Strings\n\nAbstract: TB A\n LOCATION:https://researchseminars.org/talk/QTFMS/7/ END:VEVENT BEGIN:VEVENT SUMMARY:Andrea Antinucci (University of Oxford) DTSTART:20250703T130000Z DTEND:20250703T140000Z DTSTAMP:20260422T230723Z UID:QTFMS/8 DESCRIPTION:Title: De fect Conformal Manifolds from Phantom (Non-Invertible) Symmetries\nby Andrea Antinucci (University of Oxford) as part of Quantum Theories of Fie lds\, Matter\, and Strings\n\n\nAbstract\nConformal defects have a variety of physical applications\, serving for instance as universality classes o f impurities in critical systems. When they break a continuous symmetry of the system\, they arise in families related by exactly marginal deformati ons. While these defect conformal manifolds are interesting in their own r ight\, many physical properties—such as the reflection coefficient—rem ain constant across the manifold. After reviewing these known facts\, in t his talk I will present a new mechanism through which defect conformal man ifolds can arise even in the absence of broken continuous symmetries. In t his case\, physical properties are no longer constant along the manifold\, yet they remain calculable and exhibit interesting behaviour. I will illu strate this mechanism with examples in (1+1)D CFTs and comment on possible generalizations to higher dimensions.\n LOCATION:https://researchseminars.org/talk/QTFMS/8/ END:VEVENT BEGIN:VEVENT SUMMARY:Michele Cicoli (University of Bologna) DTSTART:20250708T090000Z DTEND:20250708T100000Z DTSTAMP:20260422T230723Z UID:QTFMS/9 DESCRIPTION:Title: Re cent Progress on Inflation and Dark Energy from String Theory\nby Mich ele Cicoli (University of Bologna) as part of Quantum Theories of Fields\, Matter\, and Strings\n\n\nAbstract\nI will review recent progress in stri ng cosmology. I will describe the main features of a class of models where the inflaton is a type IIB Kaehler modulus with an approximate shift symm etry. I will illustrate how reheating can occur via the perturbative decay of the modulus into visible and hidden degrees of freedom\, paying attent ion to the production of dark radiation. I will discuss the status of de S itter vacua versus quintessence model building in string theory\, analysin g the level of control and the main challenges faced by models of dynamica l dark energy. I will finally present a working model of axion hilltop qui ntessence in string theory.\n LOCATION:https://researchseminars.org/talk/QTFMS/9/ END:VEVENT BEGIN:VEVENT SUMMARY:Fiona Burnell (University of Minnesota) DTSTART:20250821T150000Z DTEND:20250821T160000Z DTSTAMP:20260422T230723Z UID:QTFMS/10 DESCRIPTION:by Fiona Burnell (University of Minnesota) as part of Quantum Theories of Fields\, Matter\, and Strings\n\nAbstract: TBA\n LOCATION:https://researchseminars.org/talk/QTFMS/10/ END:VEVENT BEGIN:VEVENT SUMMARY:Niccolò Cribiori (KU Leuven) DTSTART:20250715T130000Z DTEND:20250715T140000Z DTSTAMP:20260422T230723Z UID:QTFMS/11 DESCRIPTION:Title: S cale separation\, how (not)?\nby Niccolò Cribiori (KU Leuven) as part of Quantum Theories of Fields\, Matter\, and Strings\n\n\nAbstract\nThe e xistence of a separation of scales between the four observed spacetime dim ensions and the yet unobserved additional ones is a minimal requirement fo r (string) phenomenology. However\, explaining the origin of this property remains an open problem. In this talk\, I will explore both sides of this issue. First\, I will present general bottom-up arguments suggesting that scale separation is challenging to achieve\, if not impossible\, in broad classes of models. Then\, I will discuss top-down constructions offering potential avenues for scale separation. In either direction\, this will de monstrate how\, among all the hierarchies in nature\, scale separation is one for which concrete progress may be within reach.\n LOCATION:https://researchseminars.org/talk/QTFMS/11/ END:VEVENT BEGIN:VEVENT SUMMARY:Ömer Mert Aksoy (MIT) DTSTART:20250806T130000Z DTEND:20250806T140000Z DTSTAMP:20260422T230723Z UID:QTFMS/12 DESCRIPTION:Title: S pacetime symmetry-enriched SymTFT: LSM anomalies\, modulated symmetries an d beyond\nby Ömer Mert Aksoy (MIT) as part of Quantum Theories of Fie lds\, Matter\, and Strings\n\n\nAbstract\nSymmetry Topological Field Theor y (SymTFT) is a framework that allows one to capture certain universal pro perties of gapped and gapless phases of matter with a symmetry from the pe rspective of topological field theory in one-higher dimension. This approa ch has been very fruitful in understanding gapped and gapless phases with internal generalized symmetries\, their anomalies and dualities between th em. In this talk\, I will describe one approach to extend the SymTFT frame work to incorporate spacetime symmetries. Concretely\, I will show that a topological order that is enriched by spacetime symmetries can act as a Sy mTFT that encodes the interplay between the spacetime and internal symmetr ies. I will provide concrete examples focusing on symmetries in 1+1D: latt ice translations\, spatial reflections\, and time reversal. For lattice tr anslations\, the interplay with internal symmetries is encoded in the SymT FT by translations permuting anyons\, which causes the continuum descripti on of the SymTFT to be a foliated field theory. I will show how this const ruction reveals the relation between Lieb-Schultz-Mattis (LSM) anomalies a nd modulated symmetries\, and classify modulated symmetry-protected topolo gical (SPT) phases. For reflection and time-reversal symmetries\, the inte rplay can additionally be encoded by symmetry fractionalization data in th e SymTFT\, which I will use to identify mixed anomalies and study gauging for such examples.\n LOCATION:https://researchseminars.org/talk/QTFMS/12/ END:VEVENT BEGIN:VEVENT SUMMARY:Po-Shen Hsin (King's College London) DTSTART:20250918T130000Z DTEND:20250918T140000Z DTSTAMP:20260422T230723Z UID:QTFMS/13 DESCRIPTION:Title: A pplication of Generalized Symmetry in Quantum Computation\nby Po-Shen Hsin (King's College London) as part of Quantum Theories of Fields\, Matte r\, and Strings\n\n\nAbstract\nI will discuss applications of generalized symmetry in fault-tolerant quantum computation. Symmetry can serve as logi cal gates in quantum codes\, and generalized symmetries provide wide varie ty of logical gates implemented by constant depth circuits.\nThese logical gates are unitary operators given by symmetry-protected topological respo nses labelled by group cohomology and can be expressed explicitly on the l attice using cohomology operations including cup product\, Steenrod square s and new combinations of higher cup products called higher Pontryagin pow ers. Implementing these gates could make it more efficient to compile spec ific types of quantum algorithms such as Shor’s algorithm. We further ex tend the construction to quantum codes with boundaries\, which generalizes the folding approach in color codes\, and generalize the discussion to go od LDPC codes.\n LOCATION:https://researchseminars.org/talk/QTFMS/13/ END:VEVENT BEGIN:VEVENT SUMMARY:Ling Lin (University of Bologna) DTSTART:20250919T140000Z DTEND:20250919T150000Z DTSTAMP:20260422T230723Z UID:QTFMS/14 DESCRIPTION:Title: R evisiting Frozen Singularities in String and M-theory\nby Ling Lin (Un iversity of Bologna) as part of Quantum Theories of Fields\, Matter\, and Strings\n\n\nAbstract\nI will review the notion of frozen singularities in compactifications of string and M-theory and their role in geometric engi neering as well as in the Swampland program. Then I will discuss some rece nt progress in understanding their generalized symmetries\, focusing on th e specific case of M-theory compactifications to 7d.\n LOCATION:https://researchseminars.org/talk/QTFMS/14/ END:VEVENT BEGIN:VEVENT SUMMARY:Yunqin Zheng (KITS\, UCAS) DTSTART:20250926T130000Z DTEND:20250926T140000Z DTSTAMP:20260422T230723Z UID:QTFMS/15 DESCRIPTION:Title: O n Continuous Non-Invertible Symmetries\nby Yunqin Zheng (KITS\, UCAS) as part of Quantum Theories of Fields\, Matter\, and Strings\n\n\nAbstract \nI will discuss the continuous non-invertible symmetries. As for continuo us invertible symmetries\, the continuous non-invertible symmetries exhibi t a generalized Noether theorem\, which implies the existence of conserved currents\, but attached to a topological operator. I will explain that su ch symmetries exist in many conformal field theories in 1+1d\, including c =1 CFTs\, WZW models\, and products of minimal models.\n LOCATION:https://researchseminars.org/talk/QTFMS/15/ END:VEVENT BEGIN:VEVENT SUMMARY:Edward Witten (Princeton\, Institute for Advanced Study) DTSTART:20251006T130000Z DTEND:20251006T140000Z DTSTAMP:20260422T230723Z UID:QTFMS/16 DESCRIPTION:Title: I ntroduction to Black Hole Thermodynamics\nby Edward Witten (Princeton\ , Institute for Advanced Study) as part of Quantum Theories of Fields\, Ma tter\, and Strings\n\nAbstract: TBA\n LOCATION:https://researchseminars.org/talk/QTFMS/16/ END:VEVENT BEGIN:VEVENT SUMMARY:Pavel Putrov (ICTP) DTSTART:20251017T140000Z DTEND:20251017T150000Z DTSTAMP:20260422T230723Z UID:QTFMS/17 DESCRIPTION:Title: B raidings on topological operators\, anomaly of higher-form symmetries and the SymTFT\nby Pavel Putrov (ICTP) as part of Quantum Theories of Fiel ds\, Matter\, and Strings\n\nAbstract: TBA\n LOCATION:https://researchseminars.org/talk/QTFMS/17/ END:VEVENT BEGIN:VEVENT SUMMARY:Brandon Rayhaun (Princeton\, Inst. Advanced Study) DTSTART:20251024T130000Z DTEND:20251024T140000Z DTSTAMP:20260422T230723Z UID:QTFMS/18 DESCRIPTION:Title: A nomalies of Defect Parameter Spaces and a Spin-Flux Duality\nby Brando n Rayhaun (Princeton\, Inst. Advanced Study) as part of Quantum Theories o f Fields\, Matter\, and Strings\n\n\nAbstract\nI will explain how the irre versibility of the renormalization group together with anomalies\, includi ng anomalies in the space of coupling constants\, can be used to constrain the IR phases of defects in familiar quantum field theories. As an exampl e\, I will use these techniques to provide evidence for a conjectural "spi n-flux duality" which describes how certain line operators are mapped acro ss particle/vortex duality in 2+1d.\n LOCATION:https://researchseminars.org/talk/QTFMS/18/ END:VEVENT BEGIN:VEVENT SUMMARY:Eric Sharpe (Virginia Tech) DTSTART:20251031T130000Z DTEND:20251031T140000Z DTSTAMP:20260422T230723Z UID:QTFMS/19 DESCRIPTION:Title: A n Introduction to Decomposition\nby Eric Sharpe (Virginia Tech) as par t of Quantum Theories of Fields\, Matter\, and Strings\n\n\nAbstract\nIn t his talk\, I will outline higher-form symmetries in quantum field theories \, focusing on local d-dimensional theories with (d-1)-form symmetries. Su ch theories are equivalent to disjoint unions of quantum field theories\, an equivalence known as `decomposition\,' with the constituent subtheories (analogous to but distinct from superselection sectors) known as universe s. I will outline some basic examples and applications\, including to con sistent anomaly restriction\, as well as recent results involving continuo us families of universes.\n LOCATION:https://researchseminars.org/talk/QTFMS/19/ END:VEVENT BEGIN:VEVENT SUMMARY:Luca Ciambelli DTSTART:20251107T150000Z DTEND:20251107T160000Z DTSTAMP:20260422T230723Z UID:QTFMS/20 DESCRIPTION:Title: T he Language of Null Hypersurfaces: Luca Ciambelli\nby Luca Ciambelli a s part of Quantum Theories of Fields\, Matter\, and Strings\n\n\nAbstract\ nCarrollian physics provides a new geometric lens to describe lightlike\, or null\, hypersurfaces. In this talk\, I will introduce the basic tools a nd concepts in order to define the Carrollian structure and explain how it naturally captures the intrinsic geometry of null manifolds. I will then show how to induce this structure directly from an ambient spacetime\, and how the familiar geometric relations of general relativity\, such as the Gauss-Codazzi equations and Einstein’s equations\, appear in this settin g. Along the way\, I will highlight connections with the BMS symmetry grou p and the emerging role of Carrollian structures in gravitational physics and holography.\n LOCATION:https://researchseminars.org/talk/QTFMS/20/ END:VEVENT BEGIN:VEVENT SUMMARY:Meng Cheng (Yale University) DTSTART:20251118T150000Z DTEND:20251118T160000Z DTSTAMP:20260422T230723Z UID:QTFMS/21 DESCRIPTION:Title: M ixed-state Topological Order in (2+1)d\nby Meng Cheng (Yale University ) as part of Quantum Theories of Fields\, Matter\, and Strings\n\n\nAbstra ct\nGround states of gapped local Hamiltonians can be classified\, up to q uasi-local unitary equivalence\, by their underlying topological order. In 2+1 dimensions\, it is widely believed—and in some cases rigorously est ablished—that topological orders are fully characterized by their topolo gical line operators that generate 1-form symmetries\, up to stacking with invertible states. Mathematically\, the topological line operators form a modular tensor category.\n\nIn this talk\, I will discuss recent progress on extending this framework to many-body mixed states. I will begin by re viewing the ground-state classification\, the role of 1-form symmetries\, and the physics of decohered topological states. I will then argue that\, under an appropriate notion of equivalence for mixed states\, (2+1)d mixed -state topological order is (partially) classified by premodular categori es.\n LOCATION:https://researchseminars.org/talk/QTFMS/21/ END:VEVENT BEGIN:VEVENT SUMMARY:Laura Donnay (SISSA\, Trieste) DTSTART:20251127T090000Z DTEND:20251127T100000Z DTSTAMP:20260422T230723Z UID:QTFMS/22 DESCRIPTION:Title: F lat Holography and BMS Particles\nby Laura Donnay (SISSA\, Trieste) as part of Quantum Theories of Fields\, Matter\, and Strings\n\n\nAbstract\n Despite recent progress\, a complete formulation of a holographic correspo ndence for flat spacetimes remains elusive.\n\nAny viable formulation shou ld be based on a correspondence between bulk and boundary states built upo n the equivalence of unitary irreducible representations (UIRs) of the asy mptotic symmetry group of flat spacetimes\, the BMS group.\n\nAfter an ext ended review on flat space holography\, I will present recent new results that provide explicit wavefunctions for the UIRs of the BMS group (the so- called BMS particles). I will outline prospects for defining an S-matrix f or BMS states that is free from infrared divergences.\n LOCATION:https://researchseminars.org/talk/QTFMS/22/ END:VEVENT BEGIN:VEVENT SUMMARY:Yuya Tanizaki (Kyoto University) DTSTART:20251205T073000Z DTEND:20251205T083000Z DTSTAMP:20260422T230723Z UID:QTFMS/23 DESCRIPTION:Title: C onfinement on $R^2 \\times T^2$ with ‘t Hooft Flux\, QCD Chiral Lagrangi an and $\\eta'$\nby Yuya Tanizaki (Kyoto University) as part of Quantu m Theories of Fields\, Matter\, and Strings\n\n\nAbstract\n4d gauge theori es are strongly coupled at low energies\, and their\nanalytic computations are quite tough problem. In recent years\, there was a\ndiscovery that $4 d$ QCD on $R^2 \\times T^2$ with the baryon-‘t Hooft flux accepts\nweakl y-coupled description with maintaining its interesting features: We\ncan d erive the chiral effective Lagrangian analytically with including the\n$\\ eta'$ field. We then show that the $\\eta'$ vortex in this $2d$ setup can be\nidentified as the quark itself\, and we discuss its connection with\nK omargodski’s pancake baryon scenario.\n LOCATION:https://researchseminars.org/talk/QTFMS/23/ END:VEVENT BEGIN:VEVENT SUMMARY:Ho-Tat Lam (University of Southern California) DTSTART:20251209T163000Z DTEND:20251209T173000Z DTSTAMP:20260422T230723Z UID:QTFMS/24 DESCRIPTION:Title: V ertex Tube Algebras Meet Topological Defects\nby Ho-Tat Lam (Universit y of Southern California) as part of Quantum Theories of Fields\, Matter\, and Strings\n\n\nAbstract\nChiral algebras and topological defects repres ent two complementary notions of symmetries in two-dimensional conformal f ield theory. In this talk\, we will explore the interplay between these tw o fundamental concepts. In particular\, we will address three interconnect ed questions: How does a chiral algebra act on the defect Hilbert spaces? What happens to a chiral algebra after gauging? And how to incorporate non -local chiral operators into chiral algebras? In answering these questions \, we will reveal an intricate mathematical structure underlying two-dimen sional conformal field theories\, which we refer to as vertex tube algebra \, that generalizes both the celebrated vertex operator algebra and the tu be algebra familiar from the study of non-invertible symmetries.\n LOCATION:https://researchseminars.org/talk/QTFMS/24/ END:VEVENT BEGIN:VEVENT SUMMARY:Dieter Lüst (Ludwig Maximilians Universität Arnold Sommerfeld Ce nter) DTSTART:20251215T150000Z DTEND:20251215T160000Z DTSTAMP:20260422T230723Z UID:QTFMS/25 DESCRIPTION:Title: Q uantum Gravity\, Strings and the Swampland\nby Dieter Lüst (Ludwig Ma ximilians Universität Arnold Sommerfeld Center) as part of Quantum Theori es of Fields\, Matter\, and Strings\n\n\nAbstract\nIn this talk\, I will g ive a short introduction to Quantum Gravity and its realization by String Theory.\nAs known for some time\, string theory predicts a huge landscape of vacua\, seen as different effective theories at low energy. However\, a s it became evident during the recent years that the space of theories tha t cannot originate from string theories is much larger than the landscape\ , and hence usually dubbed as the so-called swampland. I will discuss some of the properties of the swampland scenario and how it has recently led t o some predictions to test quantum gravity and string theory.\n LOCATION:https://researchseminars.org/talk/QTFMS/25/ END:VEVENT BEGIN:VEVENT SUMMARY:Jun Madea (Kyoto University) DTSTART:20251223T070000Z DTEND:20251223T080000Z DTSTAMP:20260422T230723Z UID:QTFMS/26 DESCRIPTION:Title: T wisted Partition Functions as Order Parameters\nby Jun Madea (Kyoto Un iversity) as part of Quantum Theories of Fields\, Matter\, and Strings\n\n \nAbstract\nFor quantum field theories with global symmetry\, we can study the behavior of the partition function with the background gauge field to diagnose different quantum phases. For the case of discrete symmetries\, we find that the symmetry-twisted partition function works as an order par ameter that discriminates spontaneous symmetry breaking (SSB)\, symmetry-p rotected topological (SPT) states\, and symmetry-enriched topological (SET ) states. We then consider its application to the case of 4d Yang-Mills th eory with adjoint matters to understand the relation between the twisted p artition function and the Wilson–’t Hooft classification. We also stud y its behavior for the spontaneously broken U(1) symmetry and interpret th e result from the viewpoint of the mixed anomaly with the emergent soliton ic symmetry.\n LOCATION:https://researchseminars.org/talk/QTFMS/26/ END:VEVENT BEGIN:VEVENT SUMMARY:Alison Warman (University of Oxford) DTSTART:20260115T150000Z DTEND:20260115T160000Z DTSTAMP:20260422T230723Z UID:QTFMS/27 DESCRIPTION:Title: P hases with Generalized Symmetries from the SymTFT\nby Alison Warman (U niversity of Oxford) as part of Quantum Theories of Fields\, Matter\, and Strings\n\n\nAbstract\nThis talk will present the systematic exploration o f quantum phases of matter with generalized (categorical) symmetries\, by means of the "Symmetry Topological Field Theory" (SymTFT). After introduci ng the general framework\, I will discuss new examples of phases with cate gorical symmetries\, including intrinsically gapless phases (which cannot be deformed to gapped phases with analogous symmetry properties) and gappe d phases in which the symmetry broken vacua carry distinct kinds of topolo gical order. Beyond pure state phases\, I will also illustrate how to clas sify mixed-state gapped phases with non-invertible symmetries using the Sy mTFT.\n LOCATION:https://researchseminars.org/talk/QTFMS/27/ END:VEVENT BEGIN:VEVENT SUMMARY:Lorenzo Di Pietro (University of Trieste) DTSTART:20260121T080000Z DTEND:20260121T090000Z DTSTAMP:20260422T230723Z UID:QTFMS/28 DESCRIPTION:Title: F -theorem for Quantum Field Theories on Anti-de Sitter Space\nby Lorenz o Di Pietro (University of Trieste) as part of Quantum Theories of Fields\ , Matter\, and Strings\n\n\nAbstract\nAfter motivating the study of quantu m field theory on the rigid background of Anti-de Sitter space and discuss ing the examples of confining gauge theories and 2d sigma models\, I will explain how to assign to any massive QFT a UV and IR finite AdS partition function. I will then discuss the proposal that this quantity is monotonic under boundary RG flows that connect different AdS-invariant boundary con ditions for the same bulk QFT.\n LOCATION:https://researchseminars.org/talk/QTFMS/28/ END:VEVENT BEGIN:VEVENT SUMMARY:Giovanni Galati (Free University of Brussels) DTSTART:20260210T150000Z DTEND:20260210T160000Z DTSTAMP:20260422T230723Z UID:QTFMS/29 DESCRIPTION:Title: C onfining Strings in a Gapless Environment\nby Giovanni Galati (Free Un iversity of Brussels) as part of Quantum Theories of Fields\, Matter\, and Strings\n\n\nAbstract\nIn this talk\, I will discuss confined strings in a gapless four-dimensional theory\, focusing on finite-tension string solu tions of the CP1 non-linear sigma model. I will analyze quantum fluctuatio ns around these configurations\, derive the corresponding spectrum\, and s tudy its properties. I will then show how one can use these results to com pute various observables like the quantum corrections to the ground-state energy and the effective string width. Through the discussion\, I will com pare these findings with the usual predictions of effective string theory. \n LOCATION:https://researchseminars.org/talk/QTFMS/29/ END:VEVENT BEGIN:VEVENT SUMMARY:Ivano Basile (Max Planck Institute for Physics) DTSTART:20260216T140000Z DTEND:20260216T150000Z DTSTAMP:20260422T230723Z UID:QTFMS/30 DESCRIPTION:Title: N on-supersymmetric Branes and Discrete Topological Terms\nby Ivano Basi le (Max Planck Institute for Physics) as part of Quantum Theories of Field s\, Matter\, and Strings\n\n\nAbstract\nIn a recent work\, Tachikawa and Z hang proved the existence of a discrete topological term in the unique non -supersymmetric heterotic string with no tachyons in ten dimensions. This theory features NS5-branes\, whose chiral degrees of freedom are not well- understood due to the absence of dualities or supersymmetry. In this paper \, we test the consistency of a tentative spectrum obtained by anomaly inf low\, studying the relation between the worldvolume theory and the discret e topological term in spacetime. Furthermore\, we conduct a bottom-up inve stigation of lower-dimensional gravitational theories with the same method s.\n LOCATION:https://researchseminars.org/talk/QTFMS/30/ END:VEVENT BEGIN:VEVENT SUMMARY:Daniel Grumiller (TU Wien) DTSTART:20260227T150000Z DTEND:20260227T160000Z DTSTAMP:20260422T230723Z UID:QTFMS/31 DESCRIPTION:Title: D ilaton Gravity in 2d as a Universal Toy Model\nby Daniel Grumiller (TU Wien) as part of Quantum Theories of Fields\, Matter\, and Strings\n\n\nA bstract\nI give an introduction and overview of 2d dilaton gravity to emph asize its fairly universal use as a toy model in physics. I highlight thre e recent and rather diverse applications: 1. SYK-like model for flat space holography with Schwarzian-like boundary action\, 2. Carroll black holes in Carroll dilaton gravity\, and 3. Critical collapse at the threshold of black hole formation.\n LOCATION:https://researchseminars.org/talk/QTFMS/31/ END:VEVENT END:VCALENDAR