Threshold approximations for a factorized selfadjoint operator family with the first and second correctors taken into account
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E. S. Vasilevskaya and T. A. Suslina
Translated by: T. A. Suslina - St. Petersburg Math. J. 23 (2012), 275-308
- DOI: https://doi.org/10.1090/S1061-0022-2012-01197-0
- Published electronically: January 23, 2012
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Abstract:
In a Hilbert space $\mathfrak {H}$, a family of operators $A(t)$ admitting a factorization of the form $A(t)= X(t)^*X(t)$, where $X(t)=X_0 +tX_1$, $t \in \mathbb {R}$, is considered. It is assumed that the point $\lambda _0=0$ is an isolated eigenvalue of finite multiplicity for $A(0)$. Let $F(t)$ be the spectral projection of $A(t)$ for the interval $[0,\delta ]$ (where $\delta$ is sufficiently small). For small $|t|$, approximations in the operator norm in $\mathfrak {H}$ are obtained for the projection $F(t)$ with an error of $O(|t|^3)$ and for the operator $A(t)F(t)$ with an error of $O(|t|^5)$ (the threshold approximations). By using these results, approximation in the operator norm in $\mathfrak {H}$ are constructed for the operator exponential $\exp (-A(t)\tau )$ for large $\tau >0$ with an error of $O(\tau ^{-3/2})$. For the resolvent $(A(t)+\varepsilon ^2 I)^{-1}$ multiplied by a suitable “smoothing” factor, approximation in the operator norm in $\mathfrak {H}$ for small $\varepsilon >0$ with an error of $O(\varepsilon )$ is obtained. All approximations are given in terms of the spectral characteristics of $A(t)$ near the bottom of the spectrum. In these approximations, the first and the second correctors are taken into account. The results are aimed at applications to homogenization problems for periodic differential operators in the small period limit.References
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Bibliographic Information
- E. S. Vasilevskaya
- Affiliation: St. Petersburg State University, Department of Physics, Ul′yanovskaya 3, Petrodvorets, St. Petersburg 198504, Russia
- Email: vasilevskaya-e@yandex.ru
- T. A. Suslina
- Affiliation: St. Petersburg State University, Department of Physics, Ul′yanovskaya 3, Petrodvorets, St. Petersburg 198504, Russia
- Email: suslina@list.ru
- Received by editor(s): June 30, 2010
- Published electronically: January 23, 2012
- Additional Notes: Supported by RFBR (grant no. 08-01-00209-a) and the Program of support of the leading scientific schools (grant NSh-5931.2010.1)
- © Copyright 2012 American Mathematical Society
- Journal: St. Petersburg Math. J. 23 (2012), 275-308
- MSC (2010): Primary 47A55
- DOI: https://doi.org/10.1090/S1061-0022-2012-01197-0
- MathSciNet review: 2841674
Dedicated: Dedicated to Vasiliĭ Mikhaĭlovich Babich on the occasion of his birthday