Cyclicity via weak$^\ast$ sequentially cyclicity in Radially weighted Besov spaces
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866913090742779904 |
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| author | Datta, Anusrika Richter, Stefan |
| author_facet | Datta, Anusrika Richter, Stefan |
| contents | A radially weighted Besov space $H$ is a space of holomorphic functions on the unit ball $\mathbb{B}_d \subseteq \mathbb{C}^d$ whose $N$-th radial derivative is square integrable with respect to a given admissible radial measure. We write $Mult(H)$ for its multiplier algebra. The cyclic vectors in $H$ are those functions $f$ whose multiplier multiples are dense in $H$. We call a multiplier has the complete Pick property. However, in more general radially weighted Besov spaces there may be multipliers that are cyclic, but not weak$^\ast$ sequentially cyclic. For bounded holomorphic functions $f$ with no zeros in $\mathbb{B}_d$, we obtain a condition on $\log f$ that implies the cyclicity of $f$ in $H$ and yields invertibility properties for $1/f$ within an associated Smirnov-type class. This condition is formulated in terms of weak$^\ast$ sequentially cyclic multipliers and can often be verified using a comparison principle: if $f, g \in Mult(H)$ satisfy $|f| \leq |g|$ and if $f$ is weak$^\ast$ sequentially cyclic, then $g$ is also weak$^\ast$ sequentially cyclic. These results provide new insights into cyclicity phenomena in radially weighted Besov spaces in settings, where $H$ fails to be a complete Pick space. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_03692 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Cyclicity via weak$^\ast$ sequentially cyclicity in Radially weighted Besov spaces Datta, Anusrika Richter, Stefan Functional Analysis Primary 47B32, 47A16, Secondary 32A37, 32H15, 30H25 A radially weighted Besov space $H$ is a space of holomorphic functions on the unit ball $\mathbb{B}_d \subseteq \mathbb{C}^d$ whose $N$-th radial derivative is square integrable with respect to a given admissible radial measure. We write $Mult(H)$ for its multiplier algebra. The cyclic vectors in $H$ are those functions $f$ whose multiplier multiples are dense in $H$. We call a multiplier has the complete Pick property. However, in more general radially weighted Besov spaces there may be multipliers that are cyclic, but not weak$^\ast$ sequentially cyclic. For bounded holomorphic functions $f$ with no zeros in $\mathbb{B}_d$, we obtain a condition on $\log f$ that implies the cyclicity of $f$ in $H$ and yields invertibility properties for $1/f$ within an associated Smirnov-type class. This condition is formulated in terms of weak$^\ast$ sequentially cyclic multipliers and can often be verified using a comparison principle: if $f, g \in Mult(H)$ satisfy $|f| \leq |g|$ and if $f$ is weak$^\ast$ sequentially cyclic, then $g$ is also weak$^\ast$ sequentially cyclic. These results provide new insights into cyclicity phenomena in radially weighted Besov spaces in settings, where $H$ fails to be a complete Pick space. |
| title | Cyclicity via weak$^\ast$ sequentially cyclicity in Radially weighted Besov spaces |
| topic | Functional Analysis Primary 47B32, 47A16, Secondary 32A37, 32H15, 30H25 |
| url | https://arxiv.org/abs/2605.03692 |