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Near holomorphy of some automorphic forms at critical points. (English) Zbl 0708.11028
In this long and subtle article some results of G. Shimura [Math. Ann. 278, 1-28 (1987; Zbl 0636.10023)] on near holomorphy of a distinguished automorphic form f on $${\mathcal Z}\times {\mathbb{C}}$$ are extended. Here $${\mathcal Z}$$ is a (bounded) symmetric domain arising from symmetric bilinear forms S over totally real number fields F. The form f in question always has an integral representation involving a Hilbert modular form of a common subfield E of the F’s, an Eisenstein series and a certain theta series associated to the S’s which allows to get a meromorphic continuation to the whole plane and guarantees real analyticity in $${\mathcal Z}$$. The following questions are at the core of investigations:
(1) finiteness and holomorphy of $$w\mapsto f(w,s_ 0).$$
(2) more generally, near holomorphy of $$w\mapsto f(w,s_ 0)$$ which amounts to say to be annihilated by a power of a certain non holomorphic differential operator.
(3) nearly holomorphy of the residue in case of a simple pole.
As to the importance of the questions above “an affirmative answer is essential to the study of the arithmetic properties of $$f(w,s_ 0)''$$. All these questions are tackled by Shimura (loc.cit.) in the case $$s=0$$. His method is extended to nonpositive integers in the right half plane $$s\geq -b/2$$ for a certain (half) integer b associated to f. Furthermore under additional assumptions on the common subfield E, the involved Hilbert modular form and the theta series better results are obtained by the author for a product of f by a certain L-series.
Reviewer: F.W.Knoeller

##### MSC:
 11F55 Other groups and their modular and automorphic forms (several variables) 11F41 Automorphic forms on $$\mbox{GL}(2)$$; Hilbert and Hilbert-Siegel modular groups and their modular and automorphic forms; Hilbert modular surfaces 32D15 Continuation of analytic objects in several complex variables 11F27 Theta series; Weil representation; theta correspondences
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##### References:
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