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Title:Covers and invariants of Deligne-Lusztig curves
Author(s):Skabelund, Dane C.
Director of Research:Duursma, Iwan
Doctoral Committee Chair(s):Ahlgren, Scott
Doctoral Committee Member(s):Nevins, Thomas; Allen, Patrick
Department / Program:Mathematics
Discipline:Mathematics
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D.
Genre:Dissertation
Subject(s):Deligne-Lusztig curves
Ree curve
maximal curves
supersingular curves
Stohr-Voloch theory
Weierstrass points
p-torsion
de Rham cohomology
Abstract:This thesis is comprised of three parts, each dealing with one or more of the Hermitian, Suzuki, and Ree curves, which are three families of algebraic curves over finite fields which have pronounced arithmetic and geometric properties. In the first part, we use a ray class field construction to produce covers of each of these three families of curves which meet the Hasse-Weil bound over suitable base fields. In the Hermitian case, the family of covers constructed coincide with the family of Giulietti-Korchmáros curves. In the second part, we study a certain linear series D on the Ree curve which gives an embedding in P^13. We compute the orders of vanishing of sections of D, and use this to determine the set of Weierstrass points of D. The third part is a computational project studying the structure of the 3-torsion group scheme of the Jacobian of the smallest Ree curve, which has genus 3627. This is accomplished by computing the action of the Frobenius and Verschiebung operators on the de Rham cohomology of the curve. As a result, we determine the Ekedahl-Oort type and a decomposition for the Dieudonné module of this curve.
Issue Date:2018-04-20
Type:Thesis
URI:http://hdl.handle.net/2142/101037
Rights Information:Copyright 2018 Dane Skabelund
Date Available in IDEALS:2018-09-04
Date Deposited:2018-05


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