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Quaternionic modular forms on the split exceptional group $G_2 = G_2^s$ were defined by Gan-Gross-Savin. A remarkable property of these automorphic functions is that they have a robust notion of Fourier expansion and Fourier coefficients,…

Number Theory · Mathematics 2023-08-21 Aaron Pollack

In this paper we study generalizations of quadratic form Poincar\'e series, which naturally occur as outputs of theta lifts. Integrating against them yields evaluations of higher Green's functions. For this we require a new regularized…

Number Theory · Mathematics 2018-06-05 Kathrin Bringmann , Ben Kane , Anna-Maria von Pippich

This is the first in a sequence of four papers, where we prove the arithmetic Siegel--Weil formula in co-rank $1$ for Kudla--Rapoport special cycles on exotic smooth integral models of unitary Shimura varieties of arbitrarily large even…

Number Theory · Mathematics 2024-05-03 Ryan C. Chen

In a previous paper we constructed $\textit{higher}$ theta series for unitary groups over function fields, and conjectured their modularity properties. Here we prove the generic modularity of the $\ell$-adic realization of higher theta…

Number Theory · Mathematics 2023-11-30 Tony Feng , Zhiwei Yun , Wei Zhang

In the 80's Kudla and Millson introduced a theta function in two variables. It behaves as a Siegel modular form with respect to the first variable, and is a closed differential form on an orthogonal Shimura variety with respect to the other…

Number Theory · Mathematics 2024-07-01 Jan Hendrik Bruinier , Riccardo Zuffetti

The theorems of Gross-Zagier and Zhang relate the N\'eron-Tate heights of complex multiplication points on the modular curve X_0(N) (and on Shimura curve analogues) with the central derivatives of automorphic L-functions. We extend these…

Number Theory · Mathematics 2012-03-01 Benjamin Howard

Gross and Zagier conjectured that the CM values (of certain Hecke translates) of the automorphic Green function $G_s(z_1,z_2)$ for the elliptic modular group at positive integral spectral parameter $s$ are given by logarithms of algebraic…

Number Theory · Mathematics 2021-02-22 Jan Hendrik Bruinier , Stephan Ehlen , Tonghai Yang

Kudla has proposed a general program to relate arithmetic intersection multiplicities of special cycles on Shimura varieties to Fourier coefficients of Eisenstein series. The lowest dimensional case, in which one intersects two codimension…

Number Theory · Mathematics 2014-01-14 Benjamin Howard

This is the fourth in a sequence of four papers, where we prove the arithmetic Siegel--Weil formula in co-rank $1$ for Kudla--Rapoport special cycles on exotic smooth integral models of unitary Shimura varieties of arbitrarily large even…

Number Theory · Mathematics 2024-05-03 Ryan C. Chen

We apply differential operators to modular forms on orthogonal groups $\mathrm{O}(2, \ell)$ to construct infinite families of modular forms on special cycles. These operators generalize the quasi-pullback. The subspaces of theta lifts are…

Number Theory · Mathematics 2021-06-30 Brandon Williams

We introduce a regularized theta lift for reductive dual pairs of the form $(Sp_4,O(V))$ with $V$ a quadratic vector space over a totally real number field $F$. The lift takes values in the space of $(1,1)$-currents on the Shimura variety…

Number Theory · Mathematics 2016-06-22 Luis E. Garcia

We construct regular integral canonical models for Shimura varieties attached to Spin groups at (possibly ramified) odd primes. We exhibit these models as schemes of 'relative PEL type' over integral canonical models of larger Spin Shimura…

Number Theory · Mathematics 2025-05-29 Keerthi Madapusi Pera

We formulate and prove a version of the arithmetic Siegel-Weil formula for (zero dimensional) Shimura varieties attached to tori, equipped with some additional data. More precisely, we define a family of ``special" divisors in terms of…

Number Theory · Mathematics 2022-10-31 Siddarth Sankaran

We prove the Kudla--Rapoport conjecture for Kr\"amer models of unitary Rapoport--Zink spaces at ramified places. It is a precise identity between arithmetic intersection numbers of special cycles on Kr\"amer models and modified derived…

Number Theory · Mathematics 2023-07-04 Qiao He , Chao Li , Yousheng Shi , Tonghai Yang

In this paper we first construct natural filtrations on the full theta lifts for any real reductive dual pairs. We will use these filtrations to calculate the associated cycles and therefore the associated varieties of Harish-Chandra…

Representation Theory · Mathematics 2013-04-26 Hung Yean Loke , Jia-jun Ma , U-Liang Tang

We define a family of arithmetic zero cycles in the arithmetic Chow group of a modular curve X_0(N), for N>3 odd and squarefree, and identify the arithmetic degrees of these cycles as q-coefficients of the central derivative of a Siegel…

Number Theory · Mathematics 2022-06-14 Siddarth Sankaran , Yousheng Shi , Tonghai Yang

The integral model of a $\mathrm{GU}(n-1,1)$ Shimura variety carries a universal abelian scheme over it, and the dual top exterior power of its Lie algebra carries a natural hermitian metric. We express the arithmetic volume of this…

Number Theory · Mathematics 2024-12-18 Jan Hendrik Bruinier , Benjamin Howard

A motivic height zeta function associated to a family of varieties parametrised by a curve is the generating series of the classes, in the Grothendieck ring of varieties, of moduli spaces of sections of this family with varying degrees.…

Algebraic Geometry · Mathematics 2018-02-21 Margaret Bilu

We study families of partitions with gap conditions that were introduced by Schur and Andrews, and describe their fundamental connections to combinatorial q-series and automorphic forms. In particular, we show that the generating functions…

Number Theory · Mathematics 2013-07-09 Kathrin Bringmann , Karl Mahlburg

We study the Faltings height pairing of arithmetic Heegner divisors and CM cycles on Shimura varieties associated to orthogonal groups. We compute the Archimedian contribution to the height pairing and derive a conjecture relating the total…

Number Theory · Mathematics 2008-07-04 Jan Hendrik Bruinier , Tonghai Yang
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