Class polynomials for nonholomorphic modular functions
Class polynomials for nonholomorphic modular functions
复制标题
非全纯模函数的类多项式
DOI:
10.1016/j.jnt.2015.07.002
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发表时间:
2013
影响因子:
0.7
通讯作者:
Andrew V. Sutherland
中科院分区:
文献类型:
--
作者:
J. Bruinier;K. Ono;Andrew V. Sutherland
We give algorithms for computing the singular moduli of suitable nonholomorphic modular functions F (z). By combining the theory of isogeny volcanoes with a beautiful observation of Masser concerning the nonholomorphic Eisenstein series E 2⁎(z), we obtain CRT-based algorithms that compute the class polynomials H D (F; x), whose roots are the discriminant D singular moduli for F (z). By applying these results to a specific weak Maass form F p (z), we obtain a CRT-based algorithm for computing partition class polynomials, a sequence of polynomials whose traces give the partition numbers p (n). Under the GRH, the expected running time of this algorithm is O (n 5/2+ o (1)). Key to these results is a fast CRT-based algorithm for computing the classical modular polynomial Φ m (X, Y) that we obtain by extending the isogeny volcano approach previously developed for prime values of m.
影响因子:
--
作者:
Johansson F
通讯作者:
Johansson F
影响因子:
1.7
作者:
J. H. Bruinier;K. Ono
通讯作者:
K. Ono