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It is shown that for any infinite dimensional simple unital AF algebra A and any closed lower bounded set K of real numbers containing zero there is a flow on A for which the set of possible inverse temperatures is K.

Operator Algebras · Mathematics 2021-06-30 Klaus Thomsen

We exhibit a unital simple mono-tracial AF algebra A with the property that for any compact set K of real numbers containing 0 there is a periodic flow on A such the set of possible inverse temperatures for that flow is K, and for each…

Operator Algebras · Mathematics 2020-11-26 Klaus Thomsen

It is shown that any bundle of KMS state spaces which can occur for a flow on a unital separable C*-algebra with a trace state can also be realized by a flow on any given unital infinite-dimensional simple AF algebra with a tracial state…

Operator Algebras · Mathematics 2021-10-13 George A. Elliott , Klaus Thomsen

Let $\varphi:X\to X$ be a homeomorphism of a compact metric space $X$. For any continuous function $F:X\to \mathbb{R}$ there is a one-parameter group $\alpha^{F}$ of automorphisms on the crossed product $C^*$-algebra…

Operator Algebras · Mathematics 2021-04-20 Johannes Christensen , Klaus Thomsen

We consider operator-algebraic dynamical systems given by actions of the real line on unital $C^*$-algebras, and especially the equilibrium states (or KMS states) of such systems. We are particularly interested in systems built from the…

Operator Algebras · Mathematics 2016-03-21 Astrid an Huef , Iain Raeburn

We consider a family of Cuntz-Pimsner algebras associated to self-similar group actions, and their Toeplitz analogues. Both families carry natural dynamics implemented by automorphic actions of the real line, and we investigate the…

Operator Algebras · Mathematics 2014-05-20 Marcelo Laca , Iain Raeburn , Jacqui Ramagge , Michael F. Whittaker

Spielberg has recently shown that Baumslag-Solitar groups associated to pairs of positive integers are quasi-lattice ordered in the sense of Nica. Thus they have tractable Toeplitz algebras. Each of these algebras carries a natural…

Operator Algebras · Mathematics 2015-03-18 Lisa Orloff Clark , Astrid an Huef , Iain Raeburn

We obtain three results: 1) Every compact simplex bundle with exactly one point in the fiber over 0 is the KMS bundle of a periodic flow on the Jiang-Su algebra. 2) Let A be a separable unital C*-algebra with a unique trace state. Suppose…

Operator Algebras · Mathematics 2022-06-15 George A. Elliott , Yasuhiko Sato , Klaus Thomsen

We introduce a non-commutative generalization of the notion of (approximately proper) equivalence relation and propose the construction of a "quotient space". We then consider certain one-parameter groups of automorphisms of the resulting…

Operator Algebras · Mathematics 2007-05-23 R. Exel , A. Lopes

To any periodic, unital and full C*-dynamical system (A, \alpha, R) an invertible operator s acting on the Banach space of trace functionals of the fixed point algebra is canonically associated. KMS states correspond to positive…

Operator Algebras · Mathematics 2009-10-31 C. Pinzari , Y. Watatani , K. Yonetani

Given any unital, finite, classifiable C$^*$-algebra $A$ with real rank zero and any compact simplex bundle with the fibre at zero being homeomorphic to the space of tracial states on $A$, we show that there exists a flow on $A$ realising…

Operator Algebras · Mathematics 2024-11-18 Robert Neagu

We provide a general description of the KMS states for flows whose fixed point algebra satisfies a certain regularity condition. This is the applied to crossed products by discrete groups, and in particular to certain flows on crossed…

Operator Algebras · Mathematics 2020-06-26 Johannes Christensen , Klaus Thomsen

We analyze the free energy and construct the Gibbs-KMS states for a class of quantum lattice systems, at low temperatures and when the interactions are almost diagonal in a suitable basis. We study systems with continuous symmetry, but our…

Mathematical Physics · Physics 2009-10-31 J. Froehlich , L. Rey-Bellet , D. Ueltschi

For every Hilbert bimodule over a C*-algebra, there are natural gauge actions of the circle on the associated Toeplitz algebra and Cuntz-Pimsner algebra, and hence natural dynamics obtained by lifting these gauge actions to actions of the…

Operator Algebras · Mathematics 2014-03-12 Zahra Afsar , Astrid an Huef , Iain Raeburn

Given a topologically free action of a countable group $G$ on a compact metric space $X$, there is a canonical correspondence between continuous 1-cocycles for this group action and diagonal 1-parameter groups of automorphisms of the…

Operator Algebras · Mathematics 2022-10-04 Johannes Christensen , Stefaan Vaes

We consider a family of $*$-commuting local homeomorphisms on a compact space, and build a compactly aligned product system of Hilbert bimodules (in the sense of Fowler). This product system has a Nica-Toeplitz algebra and a Cuntz-Pimsner…

Operator Algebras · Mathematics 2018-04-18 Zahra Afsar , Astrid an Huef , Iain Raeburn

For open quantum systems coupled to a thermal bath at inverse temperature $\beta$, it is well known that under the Born-, Markov-, and secular approximations the system density matrix will approach the thermal Gibbs state with the bath…

Quantum Physics · Physics 2011-03-15 Gernot Schaller

Several authors have recently been studying the equilibrium or KMS states on the Toeplitz algebras of finite higher-rank graphs. For graphs of rank one (that is, for ordinary directed graphs), there is a natural dynamics obtained by lifting…

Operator Algebras · Mathematics 2014-10-02 Astrid an Huef , Sooran Kang , Iain Raeburn

In this article we show that the quasi-free flows on the Cuntz algebra $\mathcal{O}_2$ are generically classifiable by the inverse temperature of their unique KMS state. Along the way, we show that a large class of quasi-free flows on the…

Operator Algebras · Mathematics 2025-09-03 Robert Neagu

We give a notion of quantum automorphism group of graph C*-algebras without sink at critical inverse temperature. This is defined to be the universal object of a category of CQG's having a linear action in the sense of [11] and preserving…

Operator Algebras · Mathematics 2020-08-20 Arnab Mandal , Soumalya Joardar
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