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Ariyan Javanpeykar

As of July 2013 I am a post-doc at the Institut für Mathematik in Mainz in the group of Stefan Müller-Stach.

In June 2013 I defended my PhD at Leiden University and the University of Paris-Sud 11. My thesis advisors were Jean-Benoît Bost, Bas Edixhoven and Robin de Jong. You can find a copy of my PhD thesis below.

 

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Contact information:

E-mail: peykar (at) uni-mainz.de
Office: 04-227
Phone number: +49 6131-39-22436

Please do not hesitate to contact me for any questions, remarks, or comments.

 

Research interests

My research focuses on applications of Arakelov theory to problems in arithmetic geometry, themes around Belyi's theorem, the arithmetic Shafarevich conjecture and the effective Andre-Oort conjecture.

Keywords and themes are: Arakelov geometry, Belyi's theorem, Shafarevich conjecture, computational aspects of étale cohomology, Arakelov inequalities, special subvarieties, Torelli theorems, good reduction.

 

Papers

  1. Polynomial bounds for Arakelov invariants of Belyi curves, with an appendix by Peter Bruin. (arXiv, journal link) Algebra and Number Theory, Vol. 8 (2014), No. 1, 89–140.
  2. Szpiro's small points conjecture for cyclic covers. (joint work with Rafael von Kaenel) (arxiv, journal link) Documenta Math., 19 (2014) 1085-1103. 
  3. Néron models and the arithmetic Shafarevich conjecture for certain canonically polarized varieties.  (journal link) Bull. London Math. Soc., (2015) 47 (1).
  4. Good reduction of algebraic groups and flag varieties. (joint work with Daniel Loughran) (arxiv, journal link )   Archiv der Math., (2015) Vol. 104, Issue 2, 133-143.
  5. An effective Arakelov-theoretic version of the hyperbolic isogeny theorem. (pdf) Submitted.
  6. Complete intersections: Moduli, Torelli, and good reduction. (joint with Daniel Loughran) (arxiv) Submitted.

 

Teaching

  1. Vorlesung/Course "Elliptic curves, complex multiplication, modular curves",  together with Stefan Müller-Stach Wintersemester 2014-2015.
  2. Übungsleiter  "Lineare Algebra und Geometrie II". Teacher: Theo de Jong. Wintersemester 2014-2015.
  3. Übungsleiter  "Algebraische Kurven und Riemannsche Flächen". Teacher: Duco van Straten. Summersemester 2013-2014
  4. Mitarbeiter für "Zahlentheorie". Teacher: Manuel Blickle. Wintersemester 2013-2014

 

Ph.D. thesis

 

In my thesis, I studied Arakelov invariants of curves. I proved explicit polynomial bounds for Arakelov invariants (such as the Faltings height) in terms of the Belyi degree. The first application (and the primary motivation to do all this) is related to the work of Couveignes and Edixhoven on computing coefficients of modular forms. The results of my thesis show that their algorithm runs in polynomial time under GRH. Also, in the direction of "computing" etale cohomology, these explicit bounds settle a conjecture of Edixhoven, de Jong and Schepers on the Faltings height of a cover of curves. You can find a published proof of these results in [1] above. In my thesis, the necessary work is done in Chapters 1, 2 and 3. In [2], joint with Rafael von Kaenel, we apply the results of [1] and Baker's theory of linear forms to prove Szpiro's small points conjecture for cyclic covers of the projective line. This article corresponds to Chapter 4 of my thesis. Note that the exposition in my thesis is very different from that of [2].

 

Seminars, Workgroups, Groupes de travail

In this seminar we familiarize students with period domains and period maps by studying as many examples as possible.

In this seminar we study the moduli of abelian varieties. The aim of this seminar is to familiarize students with the moduli theory of abelian varieties (i.e., Shimura varieties).

 In this seminar we study the book "Neron models" by Bosch, Lütkebohmert and Raynaud, the recent work of Romagny and Edixhoven on Weil's theorem, and the article by Qing Liu and Jilong Tong on Neron models for curves. The aim of this seminar is to familiarize students with techniques in algebraic geometry that are (only a bit) more difficult than those in the book by Hartshorne.

 In this seminar we studied the work of Arakelov and Parshin on one-parameter families of curves. The references are on the website, but also here.

 

Summer school on Algebraic Stacks

This summer school is organized by the  SFB/TRR 45 Bonn-Essen-Mainz and takes place in Mainz from August 31st until September 4th, 2015.

Notes, Master's thesis, Bachelor's thesis, etc.

 

Below you will find several notes written a very long time ago. In particular, they contain many inaccuracies (due to yours truly). I do feel like some of them could be helpful to some people. Therefore, I made them available here. Comments, questions and remarks are more than welcome.

 

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