From quadratic polynomials and continued fractions to modular forms

TY - JOUR

T1 - From quadratic polynomials and continued fractions to modular forms

AU - Bengoechea, Paloma

PY - 2014/8/12

Y1 - 2014/8/12

N2 - 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.

AB - 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.

KW - Binary quadratic forms

KW - Continued fractions

KW - Modular forms

KW - Period polynomials

UR - http://www.scopus.com/inward/record.url?scp=84906832964&partnerID=8YFLogxK

U2 - 10.1016/j.jnt.2014.07.001

DO - 10.1016/j.jnt.2014.07.001

M3 - Article

AN - SCOPUS:84906832964

VL - 147

SP - 24

EP - 43

JO - Journal of Number Theory

JF - Journal of Number Theory

SN - 0022-314X

ER -