通过复合多项式构造高秩曲线

Constructing Elliptic Curves over $\mathbb{Q}(T)$ with Moderate Rank

We give several new constructions for moderate rank elliptic curves over $\mathbb{Q}(T)$. In particular we construct infinitely many rational elliptic surfaces (not in Weierstrass form) of rank 6 over $\mathbb{Q}$ using polynomials of degree two in $T$. While our method generates linearly independent points, we are able to show the rank is exactly 6 \emph{without} having to verify the points are independent. The method generalizes; however, the higher rank surfaces are not rational, and we need to check that the constructed points are linearly independent.

Constructing elliptic curves from Galois representations

Given a non-isotrivial elliptic curve over an arithmetic surface, one obtains a lisse $\ell$-adic sheaf of rank two over the surface. This lisse sheaf has a number of straightforward properties: cyclotomic determinant, finite ramification, rational traces of Frobenius, and somewhere not potentially good reduction. We prove that any lisse sheaf of rank two possessing these properties comes from an elliptic curve.

Constructing families of moderate-rank elliptic curves over number fields

We generalize a construction of families of moderate rank elliptic curves over $\mathbb{Q}$ to number fields $K/\mathbb{Q}$. The construction, originally due to Steven J. Miller, Álvaro Lozano-Robledo and Scott Arms, invokes a theorem of Rosen and Silverman to show that computing the rank of these curves can be done by controlling the average of the traces of Frobenius, the construction for number fields proceeds in essentially the same way. One novelty of this method is that we can construct families of moderate rank without having to explicitly determine points and calculating determinants o…

从秩2 Galois表示构造阿贝尔簇

Constructing abelian varieties from rank 2 Galois representations

本文证明满足分圆行列式、整延拓及坏无限约化等条件的秩2局部系统，可实现为仿射曲线上阿贝尔簇族上同调的直和项，并推广Snowden-Tsimerman的椭圆曲线结果。

Ideal class groups and torsion in Picard groups of varieties

We give a new general technique for constructing and counting number fields with an ideal class group of nontrivial m-rank. Our results can be viewed as providing a way of specializing the Picard group of a variety V over $\mathbb{Q}$ to obtain class groups for number fields $\mathbb{Q}(P)$, $P\in V(\Qbar)$, for certain families of points P. In particular, we show how the problem of constructing quadratic number fields with a large-rank ideal class group can be reduced to the problem of finding a hyperelliptic curve with a rational Weierstrass point and a large rational torsion subgroup in its…

从具有实迹域的秩 3 Galois 表示构造阿贝尔簇

Constructing abelian varieties from rank 3 Galois representations with real trace field

本文证明了在数域上的光滑仿射曲线上，具有全实迹域的秩3不可约局部系统在缩小定义域后可被实现为某个阿贝尔概形上同调的直和项，核心方法涉及平方根构造、迹域限制及权-单值定理。