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We construct flows on an amalgamated free product factor and characterize the Rohlin property for them by freeness of $\mathbf{R}\times \mathbf{Z}$ actions on a measured space. As a corolally, it turns out that there exist Rohlin flows on…

Operator Algebras · Mathematics 2014-05-21 Koichi Shimada

We characterize the condition for two finite index endomorphisms on an AFD factor to be approximately unitarily equivalent. The characterization is given by using the canonical extension of endomorphisms, which is introduced by Izumi. Our…

Operator Algebras · Mathematics 2016-01-20 Koichi Shimada

We will introduce the Rohlin property for flows on von Neumann algebras and classify them up to strong cocycle conjugacy. This result provides alternative approaches to some preceding results such as Kawahigashi's classification of flows on…

Operator Algebras · Mathematics 2012-09-26 Toshihiko Masuda , Reiji Tomatsu

We show a classification theorem for locally compact separable abelain group actions on factorsw with the Rohlin property. This is a generalization of Masuda and Tomatsu's work.

Operator Algebras · Mathematics 2014-05-21 Koichi Shimada

We show that any almost periodic outer flow $\alpha : \mathbb R \curvearrowright R$ on the hyperfinite type $\mathrm{II}_1$ factor with Connes' spectrum $\Gamma(\alpha) = \mathbb R$ satisfies the Rokhlin property and thus is unique up to…

Operator Algebras · Mathematics 2026-05-13 Cyril Houdayer , Amine Marrakchi

We review the construction of flows associated to Tanaka's SDE from [9] and give an easy proof of the classification of these flows by means of probability measures on [0, 1]. Our arguments also simplify some proofs in the subsequent papers…

Probability · Mathematics 2015-01-14 Hatem Hajri

We extend the notion of the canonical extension of automorphisms of type III factors to the case of endomorphisms with finite statistical dimensions. Following the automorphism case, we introduce two notions for endomorphisms of type III…

Operator Algebras · Mathematics 2007-05-23 Masaki Izumi

Flows of the couplings of a theory of an N-component (complex) scalar field coupled to electrodynamics is investigated using the functional renormalization group formalism in d dimensions in covariant gauges. We find charged fixed points…

High Energy Physics - Phenomenology · Physics 2017-10-04 G. Fejos , T. Hatsuda

Using Baire category techniques we prove that Araki-Woods factors are not classifiable by countable structures. As a result, we obtain a far reaching strengthening as well as a new proof of the well-known theorem of Woods that the…

Operator Algebras · Mathematics 2009-12-16 Roman Sasyk , Asger Tornquist

We show the uniqueness of minimal actions of a compact Kac algebra with amenable dual on the AFD factor of type II$_1$. This particularly implies the uniqueness of minimal actions of a compact group. Our main tools are a Rohlin type…

Operator Algebras · Mathematics 2009-11-11 Toshihiko Masuda , Reiji Tomatsu

We define canonical refinements of Harder-Narasimhan filtrations and stratifications in moduli theory, generalising and relating work of Haiden-Katzarkov-Kontsevich-Pandit and Kirwan. More precisely, we define a canonical stratification on…

Algebraic Geometry · Mathematics 2023-12-01 Andrés Ibáñez Núñez

The theory of flows was used as a crucial tool in the recent proof by Margolis, Rhodes and Schilling that Krohn-Rhodes complexity is decidable. In this paper we begin a systematic study of aperiodic flows. We give the foundations of the…

Dynamical Systems · Mathematics 2025-02-04 Stuart Margolis , John Rhodes

We associate a flow $\phi$ to a solution of the vortex equations on a closed oriented Riemannian 2-manifold $(M,g)$ of negative Euler characteristic and investigate its properties. We show that $\phi$ always admits a dominated splitting and…

Differential Geometry · Mathematics 2024-10-22 Thomas Mettler , Gabriel P. Paternain

In topological data science, categories with a flow have become ubiquitous, including as special cases examples like persistence modules and sheaves. With the flow comes an interleaving distance, which has proven useful for applications. We…

Category Theory · Mathematics 2019-01-16 Joshua Cruz

We give manifestly positive Andrews-Gordon type series for the level 3 standard modules of the affine Lie algebra of type $A^{(1)}_2$. We also give corresponding bipartition identities, which have representation theoretic interpretations…

Representation Theory · Mathematics 2024-12-05 Shunsuke Tsuchioka

We will study two kinds of actions of a discrete amenable Kac algebra. The first one is an action whose modular part is normal. We will construct a new invariant which generalizes a characteristic invariant for a discrete group action, and…

Operator Algebras · Mathematics 2016-05-11 Toshihiko Masuda , Reiji Tomatsu

We give the complete classification of regular projectively Anosov flows on closed three-dimensional manifolds. More precisely, we show that such a flow must be either an Anosov flow or decomposed into a finite union of $T^2 \times…

Dynamical Systems · Mathematics 2011-09-12 Masayuki Asaoka

We investigate a new type of approximation to quantum determinants, the ``\qFd", and test numerically the conjecture that for Axiom A hyperbolic flows such determinants have a larger domain of analyticity and better convergence than the \qS…

We study the generalizations of Jonathan King's rank-one theorems (Weak-Closure Theorem and rigidity of factors) to the case of rank-one R-actions (flows) and rank-one Z^n-actions. We prove that these results remain valid in the case of…

Probability · Mathematics 2012-01-23 Élise Janvresse , Thierry De La Rue , Valery Ryzhikov

We consider a filtration on the cohomology of the structure sheaf indexed by (not necessarily reduced) divisors ``at infinity''. We show that the filtered pieces have transfers morphisms, fpqc descent, and are so called cube invariant. In…

Algebraic Geometry · Mathematics 2023-06-13 Shane Kelly , Hiroyasu Miyazaki
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