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arXiv 0908.4223math.RTmath.NT
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广义月光II:Borcherds产品

Generalized moonshine II: Borcherds products

Scott Carnahan

摘要:

利用无穷乘积恒等式构造无穷维李代数,并利用这些李代数将广义月光猜想约化为关于顶点代数和李代数上的群作用的一对假设.我们构造的李代数最终出现在一个轨道共形域论中,其对称性由怪物单群给出。我们引入向量值模函数附加到家庭的不同水平的模函数,我们证明了无穷乘积身份的一个杰出的自守函数类的两个半平面的产品。利用Borcherds-Harvey-Moore奇异theta提升,我们改写了这个结果,并证明了与整系数完全可复制模函数相连的向量值函数在所有尖点处提升为具有无穷乘积展开的自守函数.对于怪物单群的每个元素,我们构造一个无限维李代数,使得它的分母公式是由该元素的McKay-Thompson级数产生的自守函数的无穷乘积展开。这些李代数具有一个特殊的性质,即它们的单根和所有的根重数都是已知的。我们证明了在一定的假设下,作用在这些李代数上的群的特征标在上半平面上形成的函数在亏格零同余群下是常数或不变的。

英文摘要:

The goal of this paper is to construct infinite dimensional Lie algebras using infinite product identities, and to use these Lie algebras to reduce the generalized moonshine conjecture to a pair of hypotheses about group actions on vertex algebras and Lie algebras. The Lie algebras that we construct conjecturally appear in an orbifold conformal field theory with symmetries given by the monster simple group. We introduce vector-valued modular functions attached to families of modular functions of different levels, and we prove infinite product identities for a distinguished class of automorphic functions on a product of two half-planes. We recast this result using the Borcherds-Harvey-Moore singular theta lift, and show that the vector-valued functions attached to completely replicable modular functions with integer coefficients lift to automorphic functions with infinite product expansions at all cusps. For each element of the monster simple group, we construct an infinite dimensional Lie algebra, such that its denominator formula is an infinite product expansion of the automorphic function arising from that element's McKay-Thompson series. These Lie algebras have the unusual property that their simple roots and all root multiplicities are known. We show that under certain hypotheses, characters of groups acting on these Lie algebras form functions on the upper half plane that are either constant or invariant under a genus zero congruence group.

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