Buscar
Mostrando ítems 21-30 de 97
Lyapunov exponents of probability distributions with non-compact support
(2020)
A recent result of Bocker–Viana asserts that the Lyapunov exponents of compactly supported probability distributions in GL(2, R) depend continuously on the distribution. We investigate the general, possibly concompact ...
Twisting Hopf algebras from cocycle deformations
(Springer-Verlag Italia s.r.l., 2017-11)
Let H be a Hopf algebra. Any finite-dimensional lifting of V∈HHYD arising as a cocycle deformation of A= B(V) # H defines a twist in the Hopf algebra A∗, via dualization. We follow this recipe to write down explicit examples ...
C∗-algebraic covariant structures
(University of Houston, 2016)
© 2016 University of Houston. We introduce covariant structures {(script A, κ), (a, α), (ã, α)} formed of a separable C∗-algebra script A, a measurable twisted action (a, α) of the second-countable locally compact group G ...
C-*-Algebraic covariant structures
(Univ Houston, 2016)
We introduce covariant structures {(A, kappa), (a, alpha), ((a) over tilde, (alpha) over tilde)} formed of a separable C*-algebra A, a measurable twisted action (a, alpha) of the second-countable locally compact group G, ...
Twisted deformations vs. cocycle deformations for quantum groups
(World Scientific, 2020-12-12)
In this paper we study two deformation procedures for quantum groups: deformations by twists, that we call “comultiplication twisting”, as they modify the coalgebra structure, while keeping the algebra one — and deformations ...
Twisted Semigroup Algebras
(Springer, 2015-08)
We study 2-cocycle twists, or equivalently Zhang twists, of semigroup algebras over a field k. If the underlying semigroup is affine, that is abelian, cancellative and finitely generated, then Spec k[S] is an affine toric ...
Three-cocycles, nonassociative gauge transformations and Dirac's monopole
(2004)
The relation between 3-cocycles arising in the Dirac monopole problem and nonassociative gauge transformations is studied. It is shown that nonassociative extension of the group U(1) allows to obtain a consistent theory ...
The set of fiber-bunched cocycles with nonvanishing Lyapunov exponents over a partially hyperbolic map is open
(2018)
We prove that the set of fiber-bunched SL(2, R)-valued Hölder cocycles with nonvanishing Lyapunov exponents over a volume preserving, accessible and center-bunched partially hyperbolic diffeomorphism is open. Moreover, we ...
Pointed Hopf algebras over non abelian groups with decomposable braidings, I
(Academic Press Inc Elsevier Science, 2020-05)
We describe all finite-dimensional pointed Hopf algebras whose infinitesimal braiding is a fixed Yetter-Drinfeld module decomposed as the sum of two simple objects: a point and the one of transpositions of the symmetric ...