Abstract Left-Definite Theory: A Model Operator Approach, Examples, Fractional Sobolev Spaces, and Interpolation Theory
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| Main Authors: | , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866913457509498880 |
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| author | Fischbacher, Christoph Gesztesy, Fritz Hagelstein, Paul Littlejohn, Lance |
| author_facet | Fischbacher, Christoph Gesztesy, Fritz Hagelstein, Paul Littlejohn, Lance |
| contents | We use a model operator approach and the spectral theorem for self-adjoint operators in a Hilbert space to derive the basic results of abstract left-definite theory in a straightforward manner. The theory is amply illustrated with a variety of concrete examples employing scales of Hilbert spaces, fractional Sobolev spaces, and domains of (strictly) positive fractional powers of operators, employing interpolation theory.
In particular, we explicitly describe the domains of positive powers of the harmonic oscillator operator in $L^2(\mathbb{R})$ $\big($and hence that of the Hermite operator in $L^2\big(\mathbb{R}; e^{-x^2}dx)\big)\big)$ in terms of fractional Sobolev spaces, certain commutation techniques, and positive powers of (the absolute value of) the operator of multiplication by the independent variable in $L^2(\mathbb{R})$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2408_01514 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Abstract Left-Definite Theory: A Model Operator Approach, Examples, Fractional Sobolev Spaces, and Interpolation Theory Fischbacher, Christoph Gesztesy, Fritz Hagelstein, Paul Littlejohn, Lance Spectral Theory Primary: 33C45, 46B70, 46B35. Secondary: 34L40, 47B25, 47E05 We use a model operator approach and the spectral theorem for self-adjoint operators in a Hilbert space to derive the basic results of abstract left-definite theory in a straightforward manner. The theory is amply illustrated with a variety of concrete examples employing scales of Hilbert spaces, fractional Sobolev spaces, and domains of (strictly) positive fractional powers of operators, employing interpolation theory. In particular, we explicitly describe the domains of positive powers of the harmonic oscillator operator in $L^2(\mathbb{R})$ $\big($and hence that of the Hermite operator in $L^2\big(\mathbb{R}; e^{-x^2}dx)\big)\big)$ in terms of fractional Sobolev spaces, certain commutation techniques, and positive powers of (the absolute value of) the operator of multiplication by the independent variable in $L^2(\mathbb{R})$. |
| title | Abstract Left-Definite Theory: A Model Operator Approach, Examples, Fractional Sobolev Spaces, and Interpolation Theory |
| topic | Spectral Theory Primary: 33C45, 46B70, 46B35. Secondary: 34L40, 47B25, 47E05 |
| url | https://arxiv.org/abs/2408.01514 |