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We introduce an alternate set of generators for the Hecka algebra, and givean explicit formula for the action of these operators on Fourier coefficients.With this, we compute the eigenvalues of Hecke operators acting on averageSiegel theta series with half-integral weight (provided the prime associated tothe operators does not divide the level of the theta series). Next, we boundthe eigenvalues of these operators in terms of bounds on Fourier coefficients.Then we show that the half-integral weight Kitaoka subspace is stable under allHecke operators. Finally, we observe that an obvious isomorphism between Siegelmodular forms of weight $k+1/2$ and "even" Jacobi modular forms of weight $k+1$is Hecke-invariant (here the level and character are arbitrary).

A formula for the action of Hecke operators on half-integral weight Siegel modular forms and applications