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On the geometric Ramanujan conjecture
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In this paper we prove two results pertaining to the (unramified and global) geometric Langlands program. The first result is an analogue of the Ramanujan conjecture: any cuspidal D-module on Bun_G is tempered. We actually prove a more general statement: any D-module that is *-extended from a quasi-compact open substack of Bun_G is tempered. Then the assertion about cuspidal objects is an immediate consequence of a theorem of Drinfeld-Gaitsgory. Building up on this, we prove our second main result, the automorphic gluing theorem for the group SL_2: it states that any D-module on Bun_{SL_2} is determined by its tempered part and its constant term. This theorem (vaguely speaking, an analogue of Langlands' classification for the group SL_2(R)) corresponds under geometric Langlands to the spectral gluing theorem of Arinkin-Gaitsgory and the author.
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Parabolic geometric Eisenstein series and constant term functors
This paper proves that parabolic Jacquet functors on Whittaker categories match restriction and Lie algebra cohomology of representations under the geometric Casselman-Shalika equivalence.
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