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5/11/26, 10:30 AM
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Leticia F. Cugliandolo (Sorbonne University)5/11/26, 10:40 AM
After recalling some of the defining properties of the motion of classical active partices, I will introduce and characterize different models for an active quantum particle where activity arises from engineered dissipation-- specifically, from a suitably coupled nonequilibrium environment. These include a model of a particle moving on a lattice with coherent and dissipative hopping, as well...
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Shinichi Sasa (Kyoto University)5/11/26, 11:20 AM
Toward a theoretical understanding of a novel phenomenon—flux-induced stabilization of metastable states in non-equilibrium phase coexistence—we study discrete models under external driving. By analyzing the Zubarev-McLennan distribution for these models, we calculate the variational function determining the steady-state configuration of the interface between the liquid and gas regions. The...
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Masahito Ueda (University of Tokyo)5/11/26, 1:40 PM
We show that the maximum extractable work (ergotropy) from a quantum many-body system is constrained by “local athermality” of an initial state and “local entropy decrease” brought about by quantum operations. The obtained universal upper bound on ergotropy implies that the eigenstate thermalization hypothesis prohibits work extraction from energy eigenstates by means of finite-time unitary...
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Sumilan Banerjee (Indian Institute of Science)5/11/26, 2:20 PM
Control and manipulation of quantum states by measurements and bath engineering in open quantum systems, like in a quantum computer, have emerged as new paradigms in many-body physics. Taking a prototypical example of Josephson junction arrays (JJAs), we show how monitoring through continuous weak measurements and feedback can transform an insulating non-equilibrium steady state in JJAs to a...
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Takashi Mori (Keio University)5/11/26, 3:30 PM
In this talk, I present an interesting connection between quantum dynamics in an isolated system and that in an open system. Although the dynamics is unitary in isolated systems, we often observe exponential decays of physical quantities in a certain time window. In classical chaos, such exponential decays are characterized by poles of the resolvent of the time evolution operator (or the...
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Hal Tasaki (Gakushuin University)5/11/26, 4:10 PM
The Lorentz mirror model provides a clean setting to study macroscopic transport generated solely by quenched environmental randomness. We introduce a hierarchical version whose distribution of left--right crossings satisfies an exact recursion. In dimensions d>=3, we prove normal transport: the mean conductance scales as (cross-section)/(length) on all length scales. A Gaussian closure,...
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5/11/26, 4:50 PM
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Kiyoshi Kanazawa (Kyoto University)5/12/26, 9:30 AM
Stochastic thermodynamics is a powerful framework to formulate various thermodynamic bounds for small systems. However, this framework has largely relied on the Markov assumption for the underlying dynamics, and its application to non-Markov processes with strong memory has been limited, except for a few special classes (like the generalized Langevin equation and the semi-Markov processes). In...
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Andreas Dechant (Kyoto University)5/12/26, 10:10 AM
A central quantity of interest in the description of non-equilibrium phenomena is their associated entropy production, which quantifies both their intrinsic irreversibility and their practical energetic cost in the form of dissipation. In recent years, an impressive range of methods for estimating entropy production from observed phenomena, such as currents, oscillations, transition time...
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Keiji Saito (Kyoto University)5/12/26, 11:20 AM
The third law of thermodynamics forbids cooling a physical system to absolute zero in a finite number of operational steps. Although this unattainability principle has been quantified for specific state-to-state transitions, a universal, dynamics-independent bound for implementing a state-agnostic reset map remains elusive. In this work, we unveil the fundamental limits of physical map...
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Mahesh Bandi (OIST)5/12/26, 1:40 PM
Wave-topology interactions lie at the heart of numerous physical phenomena from condensed matter systems to cosmological models; the well known Aharonov-Bohm (AB) effect in Quantum Mechanics is but a striking example. This effect has classical analogues, notably in fluid dynamics where surface waves scatter off of vortices, creating wavefront dislocations, as shown in a now famous bath tub...
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Ryo Hanai (Institute of Science Tokyo)5/12/26, 2:20 PM
Unveiling universal non-equilibrium scaling laws has been a central theme in modern statistical physics, with recent attention increasingly directed toward non-equilibrium phases that exhibit rich dynamical phenomena. A striking example arises in non-reciprocal systems, where asymmetric interactions between components lead to inherently dynamic phases and unconventional criticality near a...
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Leihan Tang (Westlake University)5/12/26, 3:00 PM
Starting from the Smoluchowski for cell density profile in both spatial and orientational coordinates, we analyze the emergence of collective elliptical motion recently observed in quasi-2D bacterial suspensions. Within this framework, a necessary condition for the instability is the phase-leading response of swimming cells against periodic shear flow, in which case energy flows from cells...
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Limei Xu (Peking University)5/12/26, 4:10 PM
Disordered systems are not entirely random; they often harbor “hidden order” that cannot be captured by conventional structural descriptors. Understanding this “order within disorder” is key to uncovering the microscopic mechanisms of nonequilibrium phase transitions and to enabling the control of material properties.This report addresses the problem from both structural and spectral...
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Pik-Yin Lai (National Central University)5/12/26, 4:50 PM
Stick-slip is a common phenomenon both in nature and in many engineering applications. It is often observed in out-of-equilibrium disordered systems as a yield response to a smoothly varying external force and is characterized by intermittent bursts of irregular signals of different amplitudes, durations, and separations that result from the spontaneous depinning of mechanical contacts or...
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Hiroyasu Tajima (Kyushu University)5/13/26, 9:30 AM
Quantum technologies offer exceptional -- sometimes almost magical -- speed and performance, yet every quantum process costs physical resources. Designing next-generation quantum devices, therefore, depends on solving the following question: which resources, and in what amount, are required to implement a desired quantum process? Casting the problem in the language of quantum resource...
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Ken Funo (University of Tokyo)5/13/26, 10:10 AM
Non-Markovian dynamics arise when a system is coupled to a bath with finite correlation time, giving rise to memory effects that allow the bath to temporarily store and return excitations. However, how memory modifies irreversibility and whether it can be exploited to improve thermodynamic performance is not well established. We address this question by employing a Markovian embedding of...
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Yoshihiko Hasegawa (University of Tokyo)5/13/26, 11:20 AM
Thermodynamic uncertainty relations show that high precision in thermodynamic processes requires a physical cost, such as entropy production or dynamical activity. In this talk, I will discuss recent developments of these relations from two viewpoints. First, I will introduce fundamental precision limits in finite-dimensional quantum thermal machines. Conventional thermodynamic uncertainty...
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Jae Sung Lee (KIAS)5/13/26, 12:00 PM
Understanding the relationship between fluctuations and response is a central problem in nonequilibrium statistical physics. While the fluctuation-dissipation theorem provides this connection near equilibrium, a general framework valid far from equilibrium remains incomplete. In this talk, I present a unified fluctuation-response framework for nonequilibrium Markovian dynamics. For...
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Hajime Yoshino (Osaka University)5/13/26, 2:20 PM
Multi-layer perceptrons (MLP) are feed-forward neural networks that operate deterministically. The forward deterministic process becomes chaotic with strong enough randomness and non-linearity [1]. In this talk we discuss the corresponding backward stochastic process in the MLPs. Using statistical mechanics tools, including the replica method, we found that the forward and backward processes...
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Tridib Sadhu (Tata Institute of Fundamental Research)5/13/26, 3:00 PM
The fluctuating‑hydrodynamic framework of macroscopic fluctuation theory (MFT) has been remarkably successful in characterizing non‑equilibrium fluctuations, including large deviations, in diffusion‑dominated systems. Related ideas have also been extended to integrable models that exhibit ballistic transport. In this talk, I will discuss how similar principles can be developed for active...
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Tomohiro Sasamoto (Institute of Science Tokyo)5/13/26, 3:40 PM
Recently current fluctuations of a class of models have been shown to be described by the so called M-Wright function, which takes the form of nested Gaussian. This was first noted for a classical automaton model, but has been discussed to appear in a wide class of models including the XXZ spin chain. In this talk we explain how the distribution can be derived by an exact calculation for the...
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5/13/26, 4:20 PM
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Marie Tani (Kyoto University)5/14/26, 9:30 AM
Collective motion is widely observed in nature, from schools of fish to bird flocks and insect colonies, where groups can accomplish tasks beyond the capability of individuals. Such phenomena suggest the possibility of scalable force generation, in which macroscopic output increases with the number of active agents; however, this principle remains poorly quantified in active matter systems. We...
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Kyogo Kawaguchi (RIKEN)5/14/26, 10:10 AM
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Kazumasa A Takeuchi (University of Tokyo)5/14/26, 11:20 AM
Characteristic transport associated with nontrivial topology has been extensively studied in condensed matter physics and related areas. Recently, this concept has been successfully extended to active matter systems, but experimental realizations have thus far relied on the chirality of the active particles, which limits design capabilities. Here we report a controlled realization of...
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Simone Pigolotti (OIST)5/14/26, 12:00 PM
Pattern formation is ubiquitous in biological development. Tissue patterns are often formed as organisms grow in size. I will discuss examples of how growth affects the physics of pattern formation. My first example will be the arrangement of chromatophores on the squid squin, as an instance of disordered packing on a growing surface. I will then present a two-species toy model to explore...
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Jorge Kurchan (École Normale Supérieure)5/14/26, 2:20 PM
“Designs” are sets of points, for example on a sphere, that have the property that averages of polynomials over the set coincide with averages over the whole sphere. Similarly for the unitary group.
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One can make treat these points as interacting particles, and use liquid theory to study the problem.
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