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arXiv math/0610727math.AG
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用李代数参数化algebraic varieties

Parametrizing algebraic varieties using Lie algebras

Jana Pilnikova

摘要:

本文提出了一种新的特征零域上代数簇的参数化方法。参数化的问题被简化为寻找代数同构的问题。我们引入簇的李代数作为与它的自同构群相关的李代数。构造一个同构的这一个和一些经典的李代数(例如代数的矩阵的零迹),然后导致参数化的品种。寻找李代数的同构的问题被进一步简化为平凡化一个结合代数,这意味着寻找一个同构的代数和一个完整的矩阵代数。最后一个是一个经典的问题,在数论,当考虑到代数非封闭的领域。我们给出了数域上最多4度代数的平凡化算法。在我们的工作中,我们使用的方法参数化Del Pezzo曲面的次数为8和9的数域。该算法是针对有理数域的情况实现的。

英文摘要:

In the thesis we present a new method for parametrizing algebraic varieties over the field of characteristic zero. The problem of parametrizing is reduced to a problem of finding an isomorphism of algebras. We introduce the Lie algebra of a variety as a Lie algebra related to its group of automorphisms. Constructing an isomorphism of this one and some classical Lie algebra (for example the algebra of matrices of the zero trace) then leads to parametrizing the variety. The problem of finding an isomorphism of Lie algebras is further reduced to trivializing an associative algebra, which means finding an isomorphism of the algebra and a full matrix algebra. The last is a classical problem in number theory, when regarded over algebraically non-closed fields. We give algorithms for trivializing algebras of degrees up to 4 over number fields. In our work we used the method to parametrize Del Pezzo surfaces of degrees 8 and 9 over number fields. The algorithms are implemented for the case of the field of the rationals.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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