Variational principles for spectral radius of weighted endomorphisms of $C(X,D)$
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- by Bartosz Kosma Kwaśniewski and Andrei Lebedev PDF
- Trans. Amer. Math. Soc. 373 (2020), 2659-2698 Request permission
Abstract:
We give formulas for the spectral radius of weighted endomorphisms $a\alpha : C(X,D)\to C(X,D)$, $a\in C(X,D)$, where $X$ is a compact Hausdorff space and $D$ is a unital Banach algebra. Under the assumption that $\alpha$ generates a partial dynamical system $(X,\varphi )$, we establish two kinds of variational principles for $r(a\alpha )$: using linear extensions of $(X,\varphi )$ and using Lyapunov exponents associated with ergodic measures for $(X,\varphi )$. This requires considering (twisted) cocycles over $(X,\varphi )$ with values in an arbitrary Banach algebra $D$, and thus our analysis cannot be reduced to any of the multiplicative ergodic theorems known so far.
The established variational principles apply not only to weighted endomorphisms but also to a vast class of operators acting on Banach spaces that we call abstract weighted shifts associated with $\alpha : C(X,D)\to C(X,D)$. In particular, they are far-reaching generalizations of formulas obtained by Kitover, Lebedev, Latushkin, Stepin, and others. They are most efficient when $D=\mathcal {B}(F)$, for a Banach space $F$, and endomorphisms of $\mathcal {B}(F)$ induced by $\alpha$ are inner isometric. As a by-product we obtain a dynamical variational principle for an arbitrary operator $b\in \mathcal {B}(F)$ and that its spectral radius is always a Lyapunov exponent in some direction $v\in F$ when $F$ is reflexive.
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Additional Information
- Bartosz Kosma Kwaśniewski
- Affiliation: Faculty of Mathematics, University of Białystok, K. Ciołkowskiego 1M, 15-245 Białystok, Poland
- ORCID: 0000-0002-5173-0519
- Email: bartoszk@math.uwb.edu.pl
- Andrei Lebedev
- Affiliation: Belorussian State University, Nesavisimosti av., 4, Minsk, Belarus; and Faculty of Mathematics, University of Białystok, K. Ciołkowskiego 1M, 15-245 Białystok, Poland
- MR Author ID: 194196
- Email: lebedev@bsu.by
- Received by editor(s): March 18, 2019
- Received by editor(s) in revised form: August 21, 2019
- Published electronically: January 7, 2020
- Additional Notes: The research leading to these results has received funding from the European Union’s Seventh Framework Programme (FP7/2007-2013) under grant agreement number 621724, as well as Polish National Science Centre grant number DEC-2011/01/D/ST1/04112
- © Copyright 2019 American Mathematical Society
- Journal: Trans. Amer. Math. Soc. 373 (2020), 2659-2698
- MSC (2010): Primary 47B48, 37A99; Secondary 37H15, 47A10
- DOI: https://doi.org/10.1090/tran/7993
- MathSciNet review: 4069230