Download Automorphic forms and Shimura varieties of PGSp (2) by Yuval Z. Flicker PDF

By Yuval Z. Flicker

This ebook furthers new and fascinating advancements in experimental designs, multivariate research, biostatistics, version choice and similar topics. It positive factors articles contributed by way of many fashionable and energetic figures of their fields. those articles conceal a wide range of significant matters in glossy statistical thought, tools and their functions. detailed gains of the collections of articles are their coherence and increase in wisdom discoveries the realm of automorphic representations is a traditional continuation of reviews within the nineteenth and twentieth centuries on quantity conception and modular kinds. A tenet is a reciprocity legislations bearing on countless dimensional automorphic representations with finite dimensional Galois representations. easy kin at the Galois aspect mirror deep kin at the automorphic facet, known as "liftings." This in-depth ebook concentrates on an preliminary instance of the lifting, from a rank 2 symplectic staff PGSp(2) to PGL(4), reflecting the common embedding of Sp(2, ) in SL(4, ). It develops the means of evaluating twisted and stabilized hint formulae. It supplies a close class of the automorphic and admissible illustration of the rank symplectic PGSp(2) via a definition of packets and quasi-packets, utilizing personality relatives and hint formulae identities. It additionally exhibits multiplicity one and tension theorems for the discrete spectrum. purposes comprise the learn of the decomposition of the cohomology of an linked Shimura style, thereby linking Galois representations to geometric automorphic representations. to place those ends up in a basic context, the ebook concludes with a technical creation to Langlands' software within the zone of automorphic representations. It encompasses a facts of recognized circumstances of Artin's conjecture.  Read more... Lifting autonomic sorts of PGSp(2) to PGL(4) -- Zeta capabilities of Shimura kinds of PGSp(2) -- history

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34 I. Preliminaries Had we known the Principle of Functoriality, namely that discrete spectrum representations 7rz of GL(2, A) are parametrized by two dimensional representations qz : I? + GL(2,C) of a suitable Weil group r(=W F ) , we could conclude the rigidity theorem part of our global theorem about the lifting XI from C = SO(4) to PGL(4). However, this Principle is known W E , J F )induced , only for monomial representations qz = Ind(pz;WE,JE,, from characters p2 of WE,JE,= A;,/E:, where E, is a quadratic extension of F .

Let S = t S be a symmetric matrix in GL(n, C). Put g* = S t g P 1 S - l . T h e n the orthogonal group O ( S ,C) = { g E GL(n, C ) ;g = g * } controls its o w n fusion in GL(n, C). PROOF. Suppose that A , B are subsets of O ( S , C ) and g E GL(n,C) 1 satisfies gAg-' 1 = B. For each a in A we have a* = a , hence g*ag*-' = ( g a g p 1 ) * = gag-' (as b = b* for b = gag-'). Then c = g-'g* commutes with each a in A, and c*-' 1 = StcS-' 1 = Stg*tg-l,'-l - 1 = g-lStg-'S-' -1 = g-'g* = c. Let d be a square root of c, thus c = hd 2 .

If 7r1 x 7r2 is cuspidal, its Ao-lift is a packet, otherwise: quasi-packet. Each member of a stable packet occurs in the discrete spectrum of the group PGSp(2, A) with multiplicity one. The multiplicity m ( 7 r H ) of a member T H = @ T H ~ of an unstable [quasi-]packetX ~ ( 7 r lx 7r2) ( T I # 7r2) is not ("stable", or) constant over the [quasi-]packet. If 7r1 x 7r2 is cuspidal, it is m(7rH) = 1 -(1+ ( - l ) n ( " H ) ) 2 ( E (0,l)). Here n ( 7 r H ) is the number of components 7rzv of ITH (it is bounded b y the number of places v where both 7 r l u and 7raU are square integrable).

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