D. Arinkin, D. Gaitsgory, D. Kazhdan, S. Raskin, N. Rozenblyum, Y. Varshavsky
We prove that the trace of the Frobenius endofunctor of the category of automorphic sheaves with nilpotent singular support maps isomorphically to the space of unramified automorphic functions, settling a conjecture from [AGKRRV1]. More generally, we show that traces of Frobenius-Hecke functors produce shtuka cohomologies.
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This is an informal note that explains that the classical Langlands theory over function fields can be obtained from the geometric one by taking the trace of Frobenius. The operation of taking the trace of Frobenius takes place at the categorical level, and this we deduce that the space of automorphic functions is the trace of the Frobenius on the category of automorphic sheaves.
In this paper, by using the trace map of Frobenius, we consider problems on extending sections for positive characteristic threefolds.
The purpose of this article is to study the distribution of the trace on the unitary symplectic group. We recall its relevance to equidistribution results for the eigenvalues of the Frobenius in families of abelian varieties over finite fields, and to the limiting distribution of the number of points of curves. We give four expressions of the trace distribution if g = 2, in terms of special functions, and also an expression of the distribution of the trace in terms of elementary symmetric functions. In an appendix, we prove a formula for the trace of the exterior power of the identity represen…
Trace of Frobenius on nearby cycles for a $Γ_1(p)$-local model
本文通过Shadrach的半稳定分解，计算了Haines和Stroh构造的Siegel模簇的pro-p Iwahori水平结构整模型的近循环层上的Frobenius迹，并验证了Haines和Kottwitz的猜想。
Frobenius--Tschirnhausen ampleness
该研究探讨弗罗贝尼乌斯迹核丰沛的光滑射影簇，证明其非常态态射必有限且应为皮卡秩1的法诺簇，还证实经典型和G₂型广义格拉斯曼簇的弗罗贝尼乌斯迹核丰沛，仅低特征例外。
In a previous article, we obtained data on the distribution of traces of Frobenius of non-hyperelliptic genus $3$ curves over small finite fields. In the present one, we give a heuristic explanation of these data, by extrapolating from results on the distribution of traces of Frobenius for plane curves whose degree is small with respect to the cardinality of their finite base field. In particular, our methods shed some new light on the asymmetry of the distribution around its mean value, which is related to the Serre obstruction.
Varieties with ample Frobenius-trace kernel
研究正则变种上福布斯迹核的正性，发现其在射影空间中为 ample，但仅在 Picard 等级为 1 的 Fano 变种上成立。
The geometry of Frobenius on toric varieties
本文通过定义Frobenius支撑及除子与1-闭链的F-有效性，揭示了F-有效曲线锥与Mori锥的相互作用如何刻画环面簇的极值Mori收缩，并证明Frobenius迹核丰沛当且仅当Picard秩为1。
Unipotent representations and the categorical trace of Frobenius
本文通过构造 (infinity, 2)-范畴化并利用权理论，在 Frobenius 迹下诱导同构，从而给出分裂有限李型群 unipotent 表示分类的新证明。
We study the distribution of the Frobenius traces on $K3$ surfaces. We compare experimental data with the predictions made by the Sato--Tate conjecture, i.e. with the theoretical distributions derived from the theory of Lie groups assuming equidistribution. Our sample consists of generic $K3$ surfaces, as well as of such having real and complex multiplication. Each time, the theoretical density and the histogram obtained by counting points match in the range of visible accuracy. Thus, we report evidence for the Sato-Tate conjecture for the surfaces considered.
In the study of automorphic representations over a function field, Hitchin moduli stack and its variants naturally appear and their geometry helps the comparison of trace formulae. We give a survey on applications of this observation to a relative fundamental lemma, the arithmetic fundamental lemma and to the higher Gross-Zagier formula.
The stabilization of the Frobenius--Hecke traces on the intersection cohomology of orthogonal Shimura varieties
本文研究有理数域上特殊正交群的 Shimura 簇，证明并稳定化 Baily–Borel 紧化交上同调上 Frobenius–Hecke 迹的 Morel 公式，并借助自守表示内窥镜分类计算特殊情形的 Hasse–Weil ζ 函数。
We outline an approach to proving functoriality of automorphic representations using trace formula. More specifically, we construct a family of integral operators on the space of automorphic forms whose eigenvalues are expressed in terms of the L-functions of automorphic representations and begin the analysis of their traces using the orbital side of the stable trace formula. We show that the most interesting part, corresponding to regular conjugacy classes, is nothing but a sum over a finite-dimensional vector space over the global field, which we call the Steinberg-Hitchin base. Therefore it…
Character formula for Weil representations in terms of Frobenius traces
本文通过Frobenius迹研究Weil表示的特征公式，推广了局部域上阿贝尔簇上同调的确定性结果，并统一了p进域上的扩张条件。
An automorphic description of the zeta function of the basic stratum of certain Kottwitz varieties
本研究利用迹公式、基变换等工具，推导了某些Kottwitz簇基本层点数的自守表示与显式多项式表达，并给出高效计算方法，为相关zeta函数研究提供了新路径。
For any reductive group G over a global function field, we use the cohomology of G-shtukas with multiple modifications and the geometric Satake equivalence to prove the global Langlands correspondence for G in the "automorphic to Galois" direction. Moreover we obtain a canonical decomposition of the spaces of cuspidal automorphic forms indexed by global Langlands parameters. The proof does not rely at all on the Arthur-Selberg trace formula.
Let C be a smooth irreducible projective curve defined over a finite field $\mathbb{F}_{q}$ of q elements of characteristic p>3 and $K=\mathbb{F}_{q}(C)$ its function field and $ϕ_{\mathcal{E}}:\mathcal{E}\to C$ the minimal regular model of $\mathbf{E}/K$. For each $P\in C$ denote $\mathcal{E}_P=ϕ^{-1}_{\mathcal{E}}(P)$. The elliptic curve $E/K$ has good reduction at $P\in C$ if and only if $\mathcal{E}_P$ is an elliptic curve defined over the residue field $κ_P$ of $P$. This field is a finite extension of $\mathbb{F}_q$ of degree $°(P)$. Let $t(\mathcal{E}_P)=q^{°(P)}+1-#\mathcal{E}_P(κ_P)$ b…
Let X be a smooth projective curve. Write Bun_{SO_{2n}} for the moduli stack of SO_{2n}-torsors on X. We give a geometric interpretation of the automorphic function f on Bun_{SO_{2n}} corresponding to the minimal representation. Namely, we construct a perverse sheaf K on Bun_{SO_{2n}} such that f should be equal to the trace of Frobenius of K plus some constant function. We also calculate K explicitely for curves of genus zero and one. The construction of K is based on some explicit geometric formulas for the Fourier coefficients of f on one hand, and on the geometric theta-lifting on the othe…
Let E and E' be two elliptic curves over a number field. We prove that the reductions of E and E' at a finite place p are geometrically isogenous for infinitely many p, and draw consequences for the existence of supersingular primes. This result is an analogue for distributions of Frobenius traces of known results on the density of Noether-Lefschetz loci in Hodge theory. The proof relies on dynamical properties of the Hecke correspondences on the modular curve.
Frobenius trace fields of cohomologically rigid local systems
本文研究上同调刚性局部系统模p约化后Frobenius迹所在数域F_p的有界性问题，证明了在特定monodromy条件下或单点有界即可推出整体有界，并探讨其与强几何来源的关系。
We express the Frobenius-Hecke traces on the compactly supported cohomology of a Shimura variety of abelian type in terms of elliptic parts of stable Arthur-Selberg trace formulas for the endoscopic groups. This confirms predictions of Langlands and Kottwitz at primes where the level is hyperspecial.
A standard observation in algebraic geometry and number theory is that a ramified cover of an algebraic variety $\widetilde{X}\rightarrow X$ over a finite field $F_q$ furnishes the rational points $x\in X(F_q)$ with additional arithmetic structure: the Frobenius action on the fiber over $x$. For example, in the case of the Vieta cover of polynomials over $F_q$ this structure describes a polynomial's irreducible decomposition type. Furthermore, the distribution of these Frobenius actions is encoded in the cohomology of $\widetilde{X}$ via the Grothendieck-Lefschetz trace formula. This note pres…
Bilinear forms with trace functions over arbitrary sets, and applications to Sato-Tate
本文证明了丰饶层迹函数在任意子集支撑下的一般双线性形式非平凡上界，结合加性组合与Kloosterman层乘积和结果突破了Pólya-Vinogradov障碍，并推导出稀疏族中Kloosterman和与椭圆曲线Frobenius迹的Sato-Tate分布。
Number of cuspidal automorphic representations and Hitchin's moduli spaces
本文研究有限域上曲线的函数域中、在指定点集具有固定局部Deligne-Lusztig诱导表示的尖点自守表示计数问题，通过Hitchin模叠的群胚基数给出表达式，并利用Arthur-Selberg迹公式变体证明了几何侧的消失性结果。
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