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We construct, over any CM field, compatible systems of
-adic Galois representations that appear in the cohomology of algebraic varieties and have (for all
) algebraic monodromy groups equal to the exceptional group of type
be the Shimura variety associated to the group of spinor similitudes of a quadratic space over
. We prove a conjecture of Bruinier and Yang, relating the arithmetic intersection multiplicities of special divisors and complex multiplication points on
to the central derivatives of certain
-functions. Each such
-function is the Rankin–Selberg convolution associated with a cusp form of half-integral weight
, and the weight
theta series of a positive definite quadratic space of rank
the Shimura variety
is a classical quaternionic Shimura curve, and our result is a variant of the Gross–Zagier theorem on heights of Heegner points.
We use Lau’s classification of 2-divisible groups using Dieudonné displays to construct integral canonical models for Shimura varieties of abelian type at 2-adic places where the level is hyperspecial.
We construct regular integral canonical models for Shimura varieties attached to Spin and orthogonal groups at (possibly ramified) primes
where the level is not divisible by
. We exhibit these models as schemes of ‘relative PEL type’ over integral canonical models of larger Spin Shimura varieties with good reduction at
. Work of Vasiu–Zink then shows that the classical Kuga–Satake construction extends over the integral models and that the integral models we construct are canonical in a very precise sense. Our results have applications to the Tate conjecture for K3 surfaces, as well as to Kudla’s program of relating intersection numbers of special cycles on orthogonal Shimura varieties to Fourier coefficients of modular forms.
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