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arXiv 2007.13583math.NT
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阿贝尔曲面不满足局部-整体同构原理的例子

Examples of abelian surfaces failing the local-global principle for isogenies

Barinder S Banwait

摘要:

我们提供了数域$K$上的阿贝尔曲面的例子,这些曲面在几乎所有的好素数上的约化都具有剩余域上的素数度$\ell$有理数的等距,但它们本身不允许$K$ -有理数$\ell$ -等距。这建立在Cullinan和Sutherland的工作基础上。当$K=\mathbb{Q}$,我们确定一定的重量- $2$新形式$f$与二次傅里叶系数,其相关的模块化阿贝尔表面$A_f$表现出这样的失败的局部-全局原则的同源性。

英文摘要:

We provide examples of abelian surfaces over number fields $K$ whose reductions at almost all good primes possess an isogeny of prime degree $\ell$ rational over the residue field, but which themselves do not admit a $K$-rational $\ell$-isogeny. This builds on work of Cullinan and Sutherland. When $K=\mathbb{Q}$, we identify certain weight-$2$ newforms $f$ with quadratic Fourier coefficients whose associated modular abelian surfaces $A_f$ exhibit such a failure of a local-global principle for isogenies.

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