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Shinsei Ryu (Princeton University)3/2/26, 9:30 AM
Entanglement entropy has long served as a key diagnostic of topological order in (2+1) dimensions. In particular, the topological entanglement entropy captures a universal quantity (the total quantum dimension) of the underlying topological order. However, this information alone does not uniquely determine which topological order is realized, indicating the need for more refined probes. In...
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Brandon Rayhaun (YITP, Stony Brook)3/2/26, 11:00 AM
I will discuss the question posed in the title in the context of 2D CFTs. In particular, I will conjecture and provide some evidence that the answer is “always” if the two CFTs have the same left- and right-moving central charges, so long as one accepts topological interfaces of infinite quantum dimension. I will also illustrate how a topological interface between Theory A and Theory B allows...
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Lorenzo Bianchi (Turin U.)3/2/26, 2:00 PM
In this talk I will review the recent developments in the application of analytic bootstrap techniques to defect conformal field theories. I will briefly outline some applications and then I will focus on 1/2 BPS surface defects in N=4 SYM theory (the most notable example being Gukov Witten defects). I will show how analytic bootstrap tools can be used to compute the holographic bulk two-point...
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Wenliang Li3/2/26, 3:30 PM
The three-dimensional classical O(N) model with a boundary has received renewed interest due to the discovery of the extraordinary-log boundary universality class for 2≤N<Nc. The critical value Nc and the exponent of the boundary correlation function are related to certain amplitudes in the normal universality class. To determine their precise values, we revisit the 3d O(N) boundary conformal...
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Lorenzo Quintavalle (University of Torino)3/2/26, 4:00 PM
It is a well-established fact that any conformal field theory with a gap in the twist spectrum must contain families of multi-twist operators, whose spectrum at large spin approaches that of generalized free theory. In presence of a defect, this statement gets enriched by the existence of families of defect operators known as transverse derivative operators. In this talk, we aim to discuss...
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Yamato Honda (Kyushu U.)3/2/26, 4:30 PM
In this talk, I will explain that the (E_8)_1 WZW model has Haagerup symmetry H_3, and that gauging H_3 gives a c = 8 theory with Z(H_3) symmetry. In addition, I will suggest a relation to theories with H_3 symmetry at c = 2 and c = 6, complementing the discussion with new modular bootstrap results.
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Sakura Schafer-Nameki (Oxford University)3/3/26, 9:30 AM
I will give an overview of recent developments using the Symmetry TFT to characterize phases of matter with categorical symmetries, which turns out to have a very curious, and potentially far-reaching implication in the construction of universal quantum computation in 2D lattice models -- namely the construction of transversal phase gates.
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This gives a surprising connection between advances... -
Satoshi Yamaguchi (Osaka U.)3/3/26, 11:00 AM
Lattice field theory provides one of the most reliable nonperturbative regularizations of quantum field theory. Meanwhile, the eta invariant of the Dirac operator, defined as a regularized sum of the signs of its eigenvalues, plays an important role in symmetry-protected topological phases and in anomalies in quantum field theories. In this talk, we investigate how the eta invariant can be...
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Shu-Heng Shao (MIT)3/3/26, 2:00 PM
We study novel conformal twist defects in 4d Maxwell theory, around which electric and magnetic fields are exchanged. These are codimension-2 defects living at the end of topological defects for certain non-invertible global symmetries. We determine the operator spectrum of the twist defect by solving classical electromagnetic wave equations subject to a twisted boundary condition. Using...
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Thekla Lepper (Università di Torino)3/3/26, 3:30 PM
Defect conformal field theories (DCFTs) provide a universal framework for describing the low energy interaction of heavy degrees of freedom with light excitations. In a DCFT part of the Poincaré symmetry is broken explicitly.
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However, the fundamental laws of our world are Poincaré invariant and any breaking of space-time symmetries must be spontaneous. In particular, extended and thin objets... -
Soichiro Shimamori (Osaka U.)3/3/26, 4:00 PM
We study quenched disorder localized on a p-dimensional subspacetime in a d-dimensional conformal field theory. Motivated by the logarithmic behavior often associated with disorder, we introduce a defect setup in which bulk local operators transform in ordinary conformal representations, while defect local operators assemble into logarithmic multiplets. We refer to such objects as logarithmic...
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William Bradford Harvey (University of Victoria)3/3/26, 4:30 PM
In this talk, I will consider "bottom-up" (toy) models of Einstein gravity with either gravitating domain walls or end-of-the-world (ETW) branes. In AdS/CFT language, these bulk objects are holographically dual to codimension-one conformal defects and boundaries, respectively. Depending on which type of model, one can study notions of either an AdS/DCFT or an AdS/BCFT correspondence. From...
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Michele Del Zotto (Uppsala U.)3/4/26, 9:30 AM
Gapped phases of matter at long distance are described by TQFTs. In this talk I will discuss a physical interpretation of the TQFT partition functions in terms of the multipartite entanglement of the ground state. Based on joint work with Abhijit Gadde and Pavel Putrov.
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Christian Copetti (Oxford)3/4/26, 11:00 AM
Symmetry can be realized in an anomalous fashion on the dynamical defects of a theory. These "defect anomalies" are exact non-perturbative defect data which constrain their physics in several ways.
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In this talk, I explain how defect anomalies can be detected in scattering experiments, where they are responsible for processes in which local particles in the in-state are morphed into nonlocal... -
Hidenori Fukaya (Osaka U.)3/4/26, 2:00 PM
We would like to report on our recent study on a mathematical relation between the Atiyah-Patodi-Singer index on a manifold with boundary and the spectral flow on a closed manifold with interfaces. The talk is based on the works in collaboration with S. Aoki, M. Furuta, S. Matsuo, T. Onogi and S. Yamaguchi.
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Masataka Watanabe (U. Tokyo)3/4/26, 2:30 PM
In QED coupled to four or more Dirac fermions, the scattering of fermions off a target monopole is exotic; the out state is not in the Fock space one started with. In the s-wave reduced version of the problem, I will describe how one would measure such an out state.
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Andreas Karch (UT Austin)3/5/26, 9:30 AM
2d conformal interfaces are thought to be described by a few universal quantities, the boundary entropy, and two central charge like quantities controlling energy and information transport across the interface. We will demonstrate that in the presence of dissipation there is a third universal central charge characterizing the flow of dissipation across the interface. It is universal in that it...
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Gabriel Cuomo (NYU)3/5/26, 11:00 AM
Cusped line defects play an important role in quantum field theory, with applications ranging from scattering amplitudes to quantum quenches and Casimir-energy computations. In this talk, I will discuss general properties of cusped line defects and, in particular, the cusp anomalous dimension that governs the partition function of a defect with a cusp. After reviewing the Euclidean setting and...
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Hirosi Ooguri (Caltech)3/5/26, 2:00 PM
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Yuma Furuta (Kyushu U.)3/5/26, 3:30 PM
Interfaces in conformal field theory (CFT) appear in many contexts and sometimes play a crucial role in characterizing the theory. For example, topological interfaces have long been studied (such as the name of Verlinde lines) and there exist well-developed methods to extract the information they encode. By contrast, conformal interfaces that are not necessarily topological but conformal, such...
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Federico Ambrosino (Perimeter Institute)3/5/26, 4:00 PM
I will present recent advances in the understanding conserved defects in 2d CFTs. Both topological and non-topological defect may give rise to conserved quantities in deformed 2d CFT. I will characterize a class of translational invariant defects from the UV to the IR of an RG flows triggered by relevant perturbation of 2d CFTs. On the way I will discuss various properties of these flows in...
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Adam Chalabi (University of Turin)3/5/26, 4:30 PM
Integrability of planar N=4 super-Yang-Mills (SYM) theory enables exact computations of unprotected observables, even with the insertion of certain extended operators. While integrability techniques have been successfully applied to some domain walls and line defects, it is an open question whether there are any integrable surface defects in N=4 SYM theory. In this talk, I will examine a class...
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Sridip Pal (IHES)3/6/26, 9:30 AM
In unitary 2 dimensional CFT with c>1 and twist gap in Virasoro primaries, modular bootstrap of torus partition function in the light cone limit using rigorous complex analytic method reveals existence of twist accumulation points, and universality of operator spectrum at large spin J: the (appropriately smoothened) density of states is completely universal: theory independent upto J^{-N} for...
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Sara Murciano (Orsay)3/6/26, 11:00 AM
Measurements can qualitatively alter correlations and entanglement emerging in gapless quantum matter. In this talk, we show how a single round of measurements on gapless quantum systems can, upon rotating the measurement basis, induce non-trivial transitions separating regimes displaying universal characteristics governed by distinct boundary conformal field theories. We develop the theory...
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Rong-Xin Miao (Zhongshan University)3/6/26, 2:00 PM
This talk focuses on the gravity dual of CFTs in networks (AdS/NCFT). We prove that the junction condition on the Net-brane leads to conservation laws at network nodes. Additionally, we discuss various proposals for network entropy, confirm that the type I and II network entropies obey the holographic g-theorem, and show that the type III network entropy is non-negative. We show that AdS/NCFT...
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Toshiki Onagi (YITP)3/6/26, 3:30 PM
Wilson introduced the concept of the renormalization group to statistical physics, providing a universal understanding of critical phenomena. According to this framework, it is generally believed that scale invariance at the critical point leads to the emergence of conformal invariance. However, there exist materials in nature, such as the ferromagnet EuS, that exhibit scale symmetry but lack...
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Jiaxin Qiao (KITP)3/6/26, 4:00 PM
We initiate the study of flux tubes in confining gauge theories placed in a rigid AdS background, which serves as an infrared regulator. Varying the AdS radius from large to small allows us to interpolate between the flat space confining string, and a weakly coupled string-like object which is held together by the AdS gravitational potential. At any radius, the string preserves a subgroup of...
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Ippo Orii (KITP)3/6/26, 4:30 PM
A topological quantum field theory (TQFT) is a class of field theories that have been successfully formulated in a mathematically rigorous way, providing a framework for describing physical phenomena independent of the spacetime metric. In particular, (2+1)-dimensional TQFTs—exemplified by Chern–Simons theory—have been extensively studied in both high-energy and condensed-matter physics as toy...
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