A new optimal estimate for the norm of time-frequency localization operators
Fuente:
arXiv
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| Formato: | Preprint |
| Publicado: |
2023
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| _version_ | 1866910598379339776 |
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| author | Riccardi, Federico |
| author_facet | Riccardi, Federico |
| contents | In this paper we provide an optimal estimate for the operator norm of time-frequency localization operators with Gaussian window $L_{F,φ} : L^2(\mathbb{R}^d) \rightarrow L^2(\mathbb{R}^d)$, under the assumption that $F \in L^p(\mathbb{R}^{2d}) \cap L^q(\mathbb{R}^{2d})$ for some $p$ and $q$ in $(1,+\infty)$. We are also able to characterize optimal weight functions, whose shape turns out to depend on the ratio $\|F\|_q / \|F\|_p$. Roughly speaking, if this ratio is "sufficiently large" or "sufficiently small" optimal weight functions are certain Gaussians, while if it is in the intermediate regime the optimal functions are no longer Gaussians. As an application, we extend Lieb's uncertainty inequality to the space $L^p + L^q$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_06525 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | A new optimal estimate for the norm of time-frequency localization operators Riccardi, Federico Classical Analysis and ODEs In this paper we provide an optimal estimate for the operator norm of time-frequency localization operators with Gaussian window $L_{F,φ} : L^2(\mathbb{R}^d) \rightarrow L^2(\mathbb{R}^d)$, under the assumption that $F \in L^p(\mathbb{R}^{2d}) \cap L^q(\mathbb{R}^{2d})$ for some $p$ and $q$ in $(1,+\infty)$. We are also able to characterize optimal weight functions, whose shape turns out to depend on the ratio $\|F\|_q / \|F\|_p$. Roughly speaking, if this ratio is "sufficiently large" or "sufficiently small" optimal weight functions are certain Gaussians, while if it is in the intermediate regime the optimal functions are no longer Gaussians. As an application, we extend Lieb's uncertainty inequality to the space $L^p + L^q$. |
| title | A new optimal estimate for the norm of time-frequency localization operators |
| topic | Classical Analysis and ODEs |
| url | https://arxiv.org/abs/2311.06525 |