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Sturm type theorem for Siegel modular forms of genus 2 modulo p

Dohoon Choi, YoungJu Choie, Toshiyuki Kikuta (2013)

Acta Arithmetica

Suppose that f is an elliptic modular form with integral coefficients. Sturm obtained bounds for a nonnegative integer n such that every Fourier coefficient of f vanishes modulo a prime p if the first n Fourier coefficients of f are zero modulo p. In the present note, we study analogues of Sturm's bounds for Siegel modular forms of genus 2. As an application, we study congruences involving an analogue of Atkin's U(p)-operator for the Fourier coefficients of Siegel modular forms of genus 2.

Sur la théorie de Hida pour le groupe GSp 2 g

Vincent Pilloni (2012)

Bulletin de la Société Mathématique de France

Nous construisons des familles ordinaires p -adiques de formes modulaires pour le groupe GSp 2 g . Notre travail généralise et précise des travaux antérieurs de Hida.

Surjectivity of Siegel Φ -operator for square free level and small weight

Siegfried Böcherer, Tomoyoshi Ibukiyama (2012)

Annales de l’institut Fourier

We show the surjectivity of the (global) Siegel Φ -operator for modular forms for certain congruence subgroups of Sp ( 2 , ) and weight k = 4 , where the standard techniques (Poincaré series or Klingen-Eisenstein series) are no longer available. Our main tools are theta series and genus versions of basis problems.

Symplectic periods.

Hervé Jacquet, Stephen Rallis (1992)

Journal für die reine und angewandte Mathematik

Theta functions of quadratic forms over imaginary quadratic fields

Olav K. Richter (2000)

Acta Arithmetica

1. Introduction. Let Q be a positive definite n × n matrix with integral entries and even diagonal entries. It is well known that the theta function ϑ Q ( z ) : = g n e x p π i t g Q g z , Im z > 0, is a modular form of weight n/2 on Γ 0 ( N ) , where N is the level of Q, i.e. N Q - 1 is integral and N Q - 1 has even diagonal entries. This was proved by Schoeneberg [5] for even n and by Pfetzer [3] for odd n. Shimura [6] uses the Poisson summation formula to generalize their results for arbitrary n and he also computes the theta multiplier explicitly....

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