The functional equation for the twisted spinor L-series of genus 2

On special values of spinor L-functions of Siegel cusp eigenforms of genus 3

We compute the special values for the spinor L-function L(s,F12) in the critical strip s={12,...,19}, where F12 is the unique (up to a scalar) Siegel cusp form of degree 3 and weight 12, which was constructed by Miyawaki. These values are proportional to the product of Petersson inner products of Ramanujan's Delta by itself and the cusp form of weight 20 for SL(2,Z) by itself by a rational number and some power of Pi. We also verify this result numerically using Dokchitser's ComputeL PARI package. To our knowledge this is the first example of a spinor L-function of Siegel cusp forms of degree …

A Multi-variable Rankin-Selberg Integral for a Product of $GL_2$-twisted Spinor $L$-functions

We consider a new integral representation for $L(s_1, Π\times τ_1) L(s_2, Π\times τ_2),$ where $Π$ is a globally generic cuspidal representation of $GSp_4,$ and $τ_1$ and $τ_2$ are two cuspidal representations of $GL_2$ having the same central character. As and application, we find a new period condition for two such $L$ functions to have a pole simultaneously. This points to an intriguing connection between a Fourier coefficient of a residual representation on $GSO(12)$ and a theta function on $\widetilde{Sp}(16).$ A similar integral on $GSO(18)$ fails to unfold completely, but in a way that …

Optimal spinor selectivity for quaternion orders

Let $D$ be a quaternion algebra over a number field $F$, and $\mathscr{G}$ be an arbitrary genus of $O_F$-orders of full rank in $D$. Let $K$ be a quadratic field extension of $F$ that embeds into $D$, and $B$ be an $O_F$-order in $K$ that can be optimally embedded into some member of $\mathscr{G}$. We provide a necessary and sufficient condition for $B$ to be optimally spinor selective for the genus $\mathscr{G}$, which generalizes previous existing optimal selectivity criterions for Eichler orders as given by Arenas, Arenas-Carmona and Contreras, and by Voight independently. This allows us t…

Non-vanishing and sign changes of Hecke eigenvalues for Siegel cusp forms of genus two (with an Appendix by E. Kowalski and A. Saha)

In this paper, we show that half of non-zero coefficients of the spinor zeta function of a Siegel cusp form of genus 2 are positive and half are negative.

三元二次格陪集的 Theta 级数

Theta series of ternary quadratic lattice cosets

本文证明三元格陪集 theta 级数的三部分自然分解分别对应亏格、spinor 亏格和类不变量，验证相关猜想，并推广 $p$-邻元以构造类代表元算法。

Eichler orders, trees and Representation Fields

If H and D are two orders in a central simple algebra A with D of maximal rank, the representation field F(D|H) is a subfield of the spinor class field of the genus of D which determines the set of spinor genera of orders in that genus representing the order H. Previous work have focused on two cases, maximal orders D and commutative orders H. In this work, we show how to compute the representation field F(D|H) when D is the intersection of a finite family of maximal orders, e.g., an Eichler order, and H is arbitrary. Examples are provided.

通过数域上的亏格1曲线分裂Brauer类

Splitting Brauer classes by genus one curves over number fields

该研究证明数域上维数≥2的Severi-Brauer簇含扭曲椭圆正规曲线，进而得出数域上每个Brauer类都被亏格1曲线分裂的结论，所用方法为纤维化方法，核心是证明相关Hilbert概型光滑紧化的有理点在其Brauer-Manin集内稠密。

Hilbert模形式中零 genus 曲线的部分Hassé不变量

Partial Hasse invariants for genus zero curves in Hilbert modular varieties

本文研究了Hilbert模形式中零 genus 曲线的部分Hassé不变量的特征零提升，并通过计算Teichmüller曲线得到类似Deuring的公式。

A construction of generalized elliptic curves from twisted curves

We introduce a procedure for constructing a generalized elliptic curve from a genus-one twisted curve, and we use this procedure to define an explicit, modular isomorphism between two compactifications of moduli stacks of elliptic curves with level structure.

双曲曲面上旋量场的谱间隙

A Spectral Gap for Spinors on Hyperbolic Surfaces

本文构造了亏格趋于无穷的显式旋量双曲曲面序列，其狄拉克算子具有一致的谱间隙，且这些曲面为算术双曲曲面的覆盖塔。