From quadratic polynomials and continued fractions to modular forms

JOURNAL OF NUMBER THEORY

卷:147

Article

Bengoechea, Paloma¹ 

[1] Univ York, Dept Math, York YO10 5DD, N Yorkshire, England

关键词: Modular forms;    Period polynomials;    Binary quadratic forms;    Continued fractions;   

DOI  :  10.1016/j.jnt.2014.07.001

来源: Elsevier

【 摘 要 】

We study certain real functions defined in a very simple way by Zagier as sums of powers of quadratic polynomials with integer coefficients. These functions give the even parts of the period polynomials of the modular forms which are the coefficients in the Fourier expansion of the kernel function for the Shimura-Shintani correspondence. We give three different representations of these sums in terms of a finite set of polynomials coming from reduction of binary quadratic forms and in terms of the infinite set of transformations occurring in a continued fraction algorithm of the real variable. We deduce the exponential convergence of the sums, which was conjectured by Zagier as well as one of the three representations. (C) 2014 Elsevier Inc. All rights reserved.

【 授权许可】

Free