Results 31 to 40 of about 50,290 (183)

ON SOME INEQUALITIES FOR 𝜏 -MEASURABLE OPERATORS

Проблемы анализа, 2019
This paper deals with the Choi’s inequality for measurable operators affiliated with a given von Neumann algebra. Some Young and Cauchy-Schwarz type inequalities for 𝜏 -measurable operators are also given.
S. M. Davarpanah, M. E. Omidvar, H. R. Moradi   +2 more
doaj   +1 more source

An algebra of observables for de Sitter space

Journal of High Energy Physics, 2023
We describe an algebra of observables for a static patch in de Sitter space, with operators gravitationally dressed to the worldline of an observer. The algebra is a von Neumann algebra of Type II1.
Venkatesa Chandrasekaran, Roberto Longo, Geoff Penington, Edward Witten   +3 more
doaj   +1 more source

$L_1$-space for a positive operator affiliated with von Neumann algebra [PDF]

, 2015
In this paper we suggest an approach for constructing an L1-type space for a positive selfadjoint operator affiliated with von Neumann algebra. For such operator we intro- duce a seminorm, and prove that it is a norm if and only if the operator is ...
Novikov, Andrej
core   +2 more sources

On cardinal invariants and generators for von Neumann algebras

, 2009
We demonstrate how virtually all common cardinal invariants associated to a von Neumann algebra M can be computed from the decomposability number, dec(M), and the minimal cardinality of a generating set, gen(M).
Akemann, Behncke, Behncke, Blackadar, Comfort, Comfort, David Sherman, Dixmier, Dykema, Elliott, Feldman, Ge, Ge, Haagerup, Hewitt, Hu, Hu, Kadison, Kaplansky, Kehlet, Kruse, Marczewski, Murray, Neufang, Pearcy, Pearcy, Pedersen, Pedersen, Pondiczery, Popa, Powers, Raynaud, Rickart, Saitô, Sakai, Shen, Sherman, Smith, Smith, Suzuki, Voiculescu, von Neumann, Willig, Willig, Wogen, Yamagami   +45 more
core   +1 more source

SPICE‐Compatible Compact Modeling of Cuprate‐Based Memristors Across a Wide Temperature Range

Advanced Electronic Materials, EarlyView.
A physics‐guided compact model for YBCO memristors is introduced, incorporating carrier trapping, field‐induced detrapping, and a differential balance equation to describe their switching dynamics. The model is compared with experiments and implemented in LTspice, allowing realistic circuit‐level simulations.
Thomas Günkel, Aleix Barrera, Lluís Balcells, Narcís Mestres, Enrique Miranda, Anna Palau, Jordi Suñé   +6 more
wiley   +1 more source

Contractions in Von Neumann Algebras

Journal of Functional Analysis, 1996
Contractions with spectrum contained in the unit circle \(S^1=\{z:|z|=1\}\) can be very different from unitary operators. However, as the authors prove, in finite von Neumann algebras of Hilbert space operators the only contractions with \(\sigma(T) \subseteq S^1\) are the unitaries.
Cassier, Gilles, Fack, Thierry
openaire   +1 more source

Invariant Measure and Universality of the 2D Yang–Mills Langevin Dynamic

Communications on Pure and Applied Mathematics, EarlyView.
ABSTRACT We prove that the Yang–Mills (YM) measure for the trivial principal bundle over the two‐dimensional torus, with any connected, compact structure group, is invariant for the associated renormalised Langevin dynamic. Our argument relies on a combination of regularity structures, lattice gauge‐fixing and Bourgain's method for invariant measures ...
Ilya Chevyrev, Hao Shen
wiley   +1 more source

On the geometry of von Neumann algebra preduals

, 2013
Let $M$ be a von Neumann algebra and let $M_\star$ be its (unique) predual. We study when for every $\varphi\in M_\star$ there exists $\psi\in M_\star$ solving the equation $\|\varphi \pm \psi\|=\|\varphi\|=\|\psi\|$.
93055, 93056, Martín, Miguel, Ueda, Yoshimichi   +3 more
core   +1 more source

Existence Analysis of a Three‐Species Memristor Drift‐Diffusion System Coupled to Electric Networks

Mathematical Methods in the Applied Sciences, EarlyView.
ABSTRACT The existence of global weak solutions to a partial‐differential‐algebraic system is proved. The system consists of the drift‐diffusion equations for the electron, hole, and oxide vacancy densities in a memristor device, the Poisson equation for the electric potential, and the differential‐algebraic equations for an electric network.
Ansgar Jüngel, Tuấn Tùng Nguyến
wiley   +1 more source

Endomorphism Semigroups and Lightlike Translations

, 1994
Certain criteria are demonstrated for a spatial derivation of a von Neumann algebra to generate a one-parameter semigroup of endomorphisms of that algebra.
D. R. Davidson, H. J. Borchers, H. W. Wiesbrock, J. J. Bisognano, M. Rieffel, O. Bratteli, O. Bratteli, R. Brunetti, W. Driessler   +8 more
core   +3 more sources