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Prof. Saeko Hayashi (Kavli IPMU)25/05/2026, 09:00
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Parameshwar Pasnoori (University of Maryland)25/05/2026, 09:10
Quantum integrability is rooted in Bethe ansatz, which is a powerful mathematical framework that has been very successful in obtaining exact solutions to many-body Hamiltonians. Bethe ansatz in both the coordinate and algebraic incarnations is only applicable to Hamiltonians with constant coupling strengths. In this talk I will introduce the recently developed generalized Bethe ansatz...
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Chisa Hotta (University of Tokyo)25/05/2026, 10:30
We provide perspectives on spatial deformation techniques that are useful for driving local states to the equilibrium that mimics the thermodynamic limit.
The first case we focus on is the construction of boundary operators that effectively represent semi-infinite environments connected to the main finite system[1}. With this setup, the entanglement entropy measured in the central subsystem...
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Hosho Katsura (University of Tokyo)25/05/2026, 13:00
The eigenstate thermalization hypothesis (ETH) provides a theoretical framework for understanding how isolated quantum many-body systems reach thermal equilibrium. Recent experimental and theoretical studies have shown, however, that certain non-integrable systems can host atypical eigenstates that evade thermalization. These special states are called quantum many-body scars (QMBS), offering...
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Chihiro Matsui (University of Tokyo)25/05/2026, 14:00
We construct a class of quantum many-body systems hosting an su(3)-invariant scar subspace, extending the conventional paradigm of quantum many-body scars beyond equally spaced spectra and single-directional tower structures. Our construction is based on local constraints that realize algebraic closure within the scar subspace.
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As a result, the spectrum in the subspace forms a... -
Ryusuke Hamazaki (iTHEMS, RIKEN)25/05/2026, 15:30
Recent experimental developments in quantum simulators and quantum computers have enabled us to investigate the effects of measurement and dissipation on quantum dynamics. Theoretically, such open quantum systems are often analyzed in terms of the spectra and symmetries of the generators governing the dynamics, provided that the generators are time independent. However, it remains unclear how...
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Takashi Oka (Institute for Solid State Physics, University of Tokyo)26/05/2026, 09:00
Quantum materials demand a nonperturbative reformulation of optics: matrix-valued band Hamiltonians and quantum geometry replace the parabolic bands and optical Bloch framework of conventional semiconductor optics. I will organize this emerging field around four paradigms: Floquet engineering, dressing Bloch bands by periodic drives; Schwinger production, generalizing Zener tunneling to Dirac...
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Kohei Kawabata (Institute for Solid State Physics, University of Tokyo)26/05/2026, 10:30
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Fumika Suzuki (University of Tokyo)26/05/2026, 13:00
The Kibble–Zurek mechanism (KZM) combines Kibble’s observation of topological defects formation in cosmological phase transitions with Zurek’s theory relating their density to critical slowing down, and hence to the universality class of a second-order phase transition. The resulting KZM predicts defect density as a function of the quench rate in second-order phase transitions, in both...
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Xueda Wen (Georgia Institute of Technology)26/05/2026, 14:00
In this talk, I will introduce our ongoing work on time-dependent driven CFTs in (1+1) dimensions. I will discuss several universal features that can be studied analytically, including the quantized acceleration of pseudo-entropy in quasi-periodically driven CFTs, as well as how conformal defects influence entanglement dynamics in driven CFTs. If time permits, I will also present our recent...
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Nat Levine (University of Amsterdam)26/05/2026, 15:30
Sigma-models are a class of quantum field theories that play an important role in many areas of physics, from string theory, to condensed matter, to pions. In two dimensions, particular choices of sigma-models are known to be integrable, or exactly solvable. I will present our results with Ben Hoare and Arkady Tseytlin on what happens if the couplings of integrable sigma-models are promoted to...
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Lewis Cole (University of Edinburgh)27/05/2026, 09:00
In this talk, I will explain how to construct integrable sigma models with time-dependent couplings from 4d Chern-Simons. I will start by reviewing the basics of integrable sigma models, as well as the appropriate modifications to accommodate time-dependent coupling parameters. The main goal of this talk will be to present some useful frameworks for studying these integrable systems. At the...
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Anders Wallberg (École Polytechnique Fédérale de Lausanne)27/05/2026, 10:30
How should we define integrability in spacetime-dependent field theories? In this talk, I will argue that one needs to relax the Lax equation in a way that still renders the theory solvable. I will then show how this modified equation naturally arises from a modified version of four dimensional Chern-Simons Theory, which is known to generate many two dimensional integrable field theories....
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Takato Yoshimura (King’s College London)27/05/2026, 13:00
Fluctuations at hydrodynamic scales encapsulate invaluable information about the dynamics in many-body systems. While such hydrodynamic fluctuations in non-integrable systems are well-understood and machineries for describing them have been established, it was recently realised that those in integrable systems are of a fundamentally different nature.
In this talk, I will explain how...
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Hiromi Ebisu (iTHEMS, RIKEN)27/05/2026, 14:00
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Junichi Sakamoto (University of Osaka)27/05/2026, 15:30
In higher-dimensional gravity, black hole horizon topology is not restricted to spherical topology, and the systematic construction of exact solutions remains an important challenge.
In this talk, I explain how, under sufficient spacetime symmetries, higher-dimensional gravity reduces to a 2d space-dependent sigma model whose integrability enables exact solution construction. Using the...
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