Period functions for vector-valued Maass cusp forms of real weight, with an application to Jacobi Maass cusp forms
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arXiv
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| Format: | Preprint |
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2024
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| author | Pohl, Anke Choie, YoungJu Bruggeman, Roelof |
| author_facet | Pohl, Anke Choie, YoungJu Bruggeman, Roelof |
| contents | For vector-valued Maass cusp forms for~$SL_2(\mathbb{Z})$ with real weight~$k\in\mathbb{R}$ and spectral parameter $s\in\mathbb{C}$, $\mathrm{Re} s\in (0,1)$, $s\not\equiv \pm k/2$ mod $1$, we propose a notion of vector-valued period functions, and we establish a linear isomorphism between the spaces of Maass cusp forms and period functions by means of a cohomological approach. The period functions are a generalization of those for the classical Maass cusp forms, being solutions of a finite-term functional equation or, equivalently, eigenfunctions with eigenvalue $1$ of a transfer operator deduced from the geodesic flow on the modular surface. We apply this result to deduce a notion of period functions and related linear isomorphism for Jacobi Maass forms of weight $k+1/2$ for the semi-direct product of $SL_2(\mathbb{Z})$ with the integer points $Hei(\mathbb{Z})$ of the Heisenberg group. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_03104 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Period functions for vector-valued Maass cusp forms of real weight, with an application to Jacobi Maass cusp forms Pohl, Anke Choie, YoungJu Bruggeman, Roelof Number Theory 11F50 11F67 For vector-valued Maass cusp forms for~$SL_2(\mathbb{Z})$ with real weight~$k\in\mathbb{R}$ and spectral parameter $s\in\mathbb{C}$, $\mathrm{Re} s\in (0,1)$, $s\not\equiv \pm k/2$ mod $1$, we propose a notion of vector-valued period functions, and we establish a linear isomorphism between the spaces of Maass cusp forms and period functions by means of a cohomological approach. The period functions are a generalization of those for the classical Maass cusp forms, being solutions of a finite-term functional equation or, equivalently, eigenfunctions with eigenvalue $1$ of a transfer operator deduced from the geodesic flow on the modular surface. We apply this result to deduce a notion of period functions and related linear isomorphism for Jacobi Maass forms of weight $k+1/2$ for the semi-direct product of $SL_2(\mathbb{Z})$ with the integer points $Hei(\mathbb{Z})$ of the Heisenberg group. |
| title | Period functions for vector-valued Maass cusp forms of real weight, with an application to Jacobi Maass cusp forms |
| topic | Number Theory 11F50 11F67 |
| url | https://arxiv.org/abs/2408.03104 |