Dissertation/Thesis Abstract

On special values of hyperelliptic division polynomials and a formula of Eisenstein
by Wittenborn, Erika F., Ph.D., University of Colorado at Boulder, 2010, 115; 3419549
Abstract (Summary)

Let [special characters omitted] be the hyperelliptic curve of genus g given by the affine model y2 = x q + ¼ where q = 2g + 1 is prime, and let J be its Jacobian variety. Then J has complex multiplication by [special characters omitted], the ring of integers in the qth cyclotomic field. For α ∈ [special characters omitted], we let [α] denote the corresponding endomorphism of J. We define cyclotomic division polynomials ψα( u) for α ∈ [special characters omitted] in terms of theta functions attached to J that vanish at points Q ∈ [special characters omitted] ⊆ J exactly when [α]*Q is on the theta divisor of J. We will use a recent generalized version of a formula of Frobenius and Stickelberger to derive special values of these polynomials, and use these to provide a product formula that generalizes a formula of Eisenstein for elliptic curves relating to elliptic units. We will then relate our formula to Jacobi sums. Additionally, the theory of formal groups will be used to show that the factors in the product produce a new class of S-units attached to the hyperelliptic curve. Finally, an algebraic definition of division polynomials ψn( u) for n ∈ [special characters omitted] will be given and the lead and constant term of these will be computed algebraically in the hopes of extending this algebraic definition to cyclotomic division polynomials and providing an algebraic proof of the product formula.

Indexing (document details)
Advisor: Grant, David R.
Commitee: Ih, Su-Ion, Jessop, Elizabeth, Stade, Eric, Tubbs, Robert
School: University of Colorado at Boulder
Department: Mathematics
School Location: United States -- Colorado
Source: DAI-B 71/10, Dissertation Abstracts International
Subjects: Mathematics, Theoretical Mathematics
Keywords: Division polynomials, Formula of Eisenstein, Hyperelliptic curves, Jacobians, Product formula, Sigma functions, Values
Publication Number: 3419549
ISBN: 9781124195537