Automorphisms that commute with a modular automorphism

1984 ◽  
Vol 8 (6) ◽  
pp. 501-506 ◽  
Author(s):  
heide Narnhofer
Keyword(s):  
Modular Automorphism

scholarly journals MARKOVIAN KMS-STATES FOR ONE-DIMENSIONAL SPIN CHAINS

1999 ◽  
Vol 02 (04) ◽  
pp. 645-661 ◽  
Author(s):  
LUIGI ACCARDI ◽  
VOLKMAR LIEBSCHER
Keyword(s):  
Quantum Spin ◽  
Spin Chains ◽  
Quantum Spin Chains ◽  
Kms States ◽  
One Dimensional ◽  
Locality Property ◽  
Conditional Expectations ◽  
Starting Point ◽  
Modular Automorphism ◽  
Quantum Spin Lattices

We characterize a class of quantum Markov states in terms of a locality property of their modular automorphism group or, equivalently, of their φ-conditional expectations and we give an explicit description of the structure of these states. This study is meant as a starting point for the investigation of the structure of Markovian KMS-states of quantum spin chains as well as of multidimensional quantum spin lattices.

Conditional expectation and stochastic integrals in non-commutative Lp spaces

1991 ◽  
Vol 110 (2) ◽  
pp. 365-383 ◽  
Author(s):  
Stanisław Goldstein
Keyword(s):  
General Scheme ◽  
Stochastic Integrals ◽  
Norm Topology ◽  
Von Neumann ◽  
Measure Topology ◽  
Modular Automorphism ◽  
Faithful Normal State ◽  
Measurable Operators ◽  
Commutative Theory

The aim of the paper is to propose a general scheme for the consideration of non-commutative stochastic integrals. The role of a probability space is played by a couple (, φ0), where is a von Neumann algebra and φ0 is a faithful normal state on . Our processes live in the algebra of all measurable operators associated with the crossed product of by the modular automorphism group The algebra contains all the (Haagerup's) Lp spaces over . The measure topology of the algebra has the nice feature of inducing the Lp norm topology on the Lp spaces, which makes it particularly suitable for defining stochastic integrals. The commutative theory fits smoothly into the scheme, although there exists no canonical way of embedding the algebra of (commutative) random variables into . In fact, for any commutative stochastic process we have a family of different non-commutative stochastic processes corresponding to the process. This arbitrariness seems to be quite natural in the non-commutative context. An appropriate example can be found at the end of the paper (Section 6, C4).

scholarly journals Twisted Hochschild homology of quantum flag manifolds: 2-cycles from invariant projections

2020 ◽  
pp. 2150036
Author(s):  
Marco Matassa
Keyword(s):  
Hochschild Homology ◽  
Flag Manifolds ◽  
Generalized Flag Manifolds ◽  
Modular Automorphism

We study the twisted Hochschild homology of quantum full flag manifolds, with the twist being the modular automorphism of the Haar state. We show that nontrivial [Formula: see text]-cycles can be constructed from appropriate invariant projections. Moreover, we show that [Formula: see text] has dimension at least [Formula: see text]. We also discuss the case of generalized flag manifolds and present the example of the quantum Grassmannians.

Twisted cyclic theory and an index theory for the gauge invariant KMS state on the Cuntz algebra On

2009 ◽  
Vol 6 (2) ◽  
pp. 339-380 ◽  
Author(s):  
A.L. Carey ◽  
J. Phillips ◽  
A. Rennie
Keyword(s):  
Automorphism Group ◽  
General Theory ◽  
Index Theory ◽  
Index Theorem ◽  
Cuntz Algebra ◽  
Spectral Flow ◽  
Gauge Invariant ◽  
Gauge Action ◽  
Cuntz Algebras ◽  
Modular Automorphism

AbstractThis paper presents, by example, an index theory appropriate to algebras without trace. Whilst we work exclusively with Cuntz algebras the exposition is designed to indicate how to develop a general theory. Our main result is an index theorem (formulated in terms of spectral flow) using a twisted cyclic cocycle where the twisting comes from the modular automorphism group for the canonical gauge action on each Cuntz algebra. We introduce a modified K1-group for each Cuntz algebra which has an index pairing with this twisted cocycle. This index pairing for Cuntz algebras has an interpretation in terms of Araki's notion of relative entropy.

scholarly journals On certain decompositional properties of von Neumann algebras

1987 ◽  
Vol 29 (2) ◽  
pp. 177-179 ◽  
Author(s):  
A. B. Thaheem
Keyword(s):  
Von Neumann Algebra ◽  
Von Neumann Algebras ◽  
Automorphism Groups ◽  
Geometric Interpretation ◽  
Jordan Algebras ◽  
Central Projection ◽  
Von Neumann ◽  
Modular Automorphism ◽  
Groups Of Automorphisms ◽  
Relevant Work

It is well known that if α and β are commuting *-automorphisms of a von Neumann algebra M satisfying the equation α + α-1 = β + β-1 then M can be decomposed into a direct sum of subalgebras Mp and M(l − p) by a central projection p in M such that α = β on Mp and α = β-1 on M(1 − p) (see, for instance, [6], [7], [2]). Originally this equation arose in the Tomita-Takesaki theory (see, for example, [11]) in the form of one-parameter modular automorphism groups and later on it has been studied for arbitrary automorphisms and one-parameter groups of automorphisms on von Neumann algebras [7], [8], [9]. In the case of automorphism groups satisfying the above equation, one has a similar decomposition but this time without assuming the commutativity condition (cf. [7], [8]). For another relevant work on one-parameter groups of automorphisms which is close to our papers [7] and [8], we refer to Ciorănescu and Zsidó [1]. Regarding applications, this equation has been used for arbitrary automorphisms in the geometric interpretation of the Tomita-Takesaki theory [2] and in the case of automorphism groups it has been a fundamental tool in the generalization of the Tomita-Takesaki theory to Jordan algebras [3]. We may remark that the decomposition in the commuting case [6], [7] is much simpler than in the case of automorphism groups in the non-commutative situation [8]. In some cases one can obtain the decomposition for an arbitrary pair of automorphisms without assuming their commutativity but the problem in the general case has been unresolved. Recently we have shown that if α and β are *-automorphisms of a von Neumann algebra M satisfying the equation α + α-1 = β + β-1 (without assuming the commutativity of α and β) then there exists a central projection p in M such that α2= β2 on Mp and α2 = β−2 on M(l − p) [10].

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