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A construction of residues of Eisenstein series and related square-integrable classes in the cohomology of arithmetic groups of low k-rank

A construction of residues of Eisenstein series and related square-integrable classes in the... AbstractThe cohomology of an arithmetic congruence subgroupof a connected reductive algebraic group definedover a number field is captured in theautomorphic cohomology of that group.The residual Eisenstein cohomology is by definition the part of theautomorphic cohomology represented by square-integrableresidues of Eisenstein series. The existence ofresidual Eisenstein cohomology classes depends ona subtle combination of geometric conditions (comingfrom cohomological reasons) and arithmetic conditionsin terms of analytic properties of automorphicL-functions (coming from the study of polesof Eisenstein series). Hence,there are almost nounconditional results in the literature regarding the very existenceof non-trivial residual Eisenstein cohomology classes. In thispaper, we show the existence of certain non-trivial residualcohomology classes in the case of the split symplectic,and odd and even special orthogonal groups of ranktwo, as well as the exceptional group of type G2{\mathrm{G}_{2}},defined over a totally real number field.The construction of cuspidal automorphic representations of GL2{\mathrm{GL}_{2}}withprescribed local and global properties is decisive in this context. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Forum Mathematicum de Gruyter

A construction of residues of Eisenstein series and related square-integrable classes in the cohomology of arithmetic groups of low k-rank

Forum Mathematicum , Volume 31 (5): 39 – Sep 1, 2019

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References (92)

Publisher
de Gruyter
Copyright
© 2019 Walter de Gruyter GmbH, Berlin/Boston
ISSN
0933-7741
eISSN
1435-5337
DOI
10.1515/forum-2019-0029
Publisher site
See Article on Publisher Site

Abstract

AbstractThe cohomology of an arithmetic congruence subgroupof a connected reductive algebraic group definedover a number field is captured in theautomorphic cohomology of that group.The residual Eisenstein cohomology is by definition the part of theautomorphic cohomology represented by square-integrableresidues of Eisenstein series. The existence ofresidual Eisenstein cohomology classes depends ona subtle combination of geometric conditions (comingfrom cohomological reasons) and arithmetic conditionsin terms of analytic properties of automorphicL-functions (coming from the study of polesof Eisenstein series). Hence,there are almost nounconditional results in the literature regarding the very existenceof non-trivial residual Eisenstein cohomology classes. In thispaper, we show the existence of certain non-trivial residualcohomology classes in the case of the split symplectic,and odd and even special orthogonal groups of ranktwo, as well as the exceptional group of type G2{\mathrm{G}_{2}},defined over a totally real number field.The construction of cuspidal automorphic representations of GL2{\mathrm{GL}_{2}}withprescribed local and global properties is decisive in this context.

Journal

Forum Mathematicumde Gruyter

Published: Sep 1, 2019

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