Abstract
Braverman and Kazhdan (2000) introduced influential conjectures aimed at generalizing the Fourier transform and the Poisson summation formula. Their conjectures should imply that quite general Langlands L-functions have meromorphic continuations and functional equations as predicted by Langlands’ functoriality conjecture. As an evidence for their conjectures, Braverman and Kazhdan (2002) considered a setting related to the so-called doubling method in a later paper and proved the corresponding Poisson summation formula under restrictive assumptions on the functions involved. The connection between the two papers is made explicit in the work of Li (2018). In this paper, we consider a special case of the setting in Braverman and Kazhdan’s later paper and prove a refined Poisson summation formula that eliminates the restrictive assumptions of that paper. Along the way we provide analytic control on the Schwartz space we construct; this analytic control was conjectured to hold (in a slightly different setting) in the work of Braverman and Kazhdan (2002).
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Acknowledgements
This work was supported by the National Science Foundation of the USA (Grant Nos. DMS-1405708 and DMS-1901883). The second author was supported by the National Science Foundation of the USA (Grant Nos. DMS-1702218 and DMS-1848058), and by a start-up fund from the Department of Mathematics at Purdue University. The authors thank Herve Jacquet and Aaron Pollack for their interest in the results in this paper and for helpful comments and suggestions. The authors thank Wen-Wei Li, Yiannis Sakellaridis, and Freydoon Shahidi for useful conversations, and thank Freydoon Shahidi and Wen-Wei Li for sharing [22, 34] with them. The authors also thank Heekyoung Hahn for the help with editing and for her constant encouragement. Thanks are due to the anonymous referees for several useful comments. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation.
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Getz, J.R., Liu, B. A refined Poisson summation formula for certain Braverman-Kazhdan spaces. Sci. China Math. 64, 1127–1156 (2021). https://doi.org/10.1007/s11425-018-1616-0
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DOI: https://doi.org/10.1007/s11425-018-1616-0
Keywords
- Braverman-Kazhdan program
- generalized Fourier transforms
- generalized Poisson summation
- spherical varieties