Locally harmonic Maass forms and periods of meromorphic modular forms

We investigate a new family of locally harmonic Maass forms which correspond to periods of modular forms. They transform like negative weight modular forms and are harmonic apart from jump singularities along infinite geodesics. Our main result is an explicit splitting of the new locally harmonic Ma...

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Bibliographic Details
Published in:Transactions of the American Mathematical Society 2022-01, Vol.375 (1), p.501
Main Authors: Steffen Löbrich, Markus Schwagenscheidt
Format: Article
Language:English
Online Access:Get full text
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Summary:We investigate a new family of locally harmonic Maass forms which correspond to periods of modular forms. They transform like negative weight modular forms and are harmonic apart from jump singularities along infinite geodesics. Our main result is an explicit splitting of the new locally harmonic Maass forms into a harmonic part and a locally polynomial part that captures the jump singularities. As an application, we obtain finite rational formulas for suitable linear combinations of periods of meromorphic modular forms associated to positive definite binary quadratic forms.
ISSN:0002-9947
1088-6850
DOI:10.1090/tran/8528