Abstract

Abstract This paper concerns the study of the Schwartz differential equation { h , τ } = s ⁢ E 4 ⁡ ( τ ) {\{h,\tau\}=s\operatorname{E}_{4}(\tau)} , where E 4 {\operatorname{E}_{4}} is the weight 4 Eisenstein series and s is a complex parameter. In particular, we determine all the values of s for which the solutions h are modular functions for a finite index subgroup of SL 2 ⁡ ( ℤ ) {\operatorname{SL}_{2}({\mathbb{Z}})} . We do so using the theory of equivariant functions on the complex upper-half plane as well as an analysis of the representation theory of SL 2 ⁡ ( ℤ ) {\operatorname{SL}_{2}({\mathbb{Z}})} . This also leads to the solutions to the Fuchsian differential equation y ′′ + s ⁢ E 4 ⁡ y = 0 {y^{\prime\prime}+s\operatorname{E}_{4}y=0} .

Highlights

  • Let D be a domain in C and f a meromorphic function on D

  • This paper concerns the study of the Schwartz differential equation {h, τ} = s E4(τ), where E4 is the weight 4 Eisenstein series and s is a complex parameter

  • This leads to the solutions to the Fuchsian differential equation y󸀠󸀠 + s E4 y = 0

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Summary

Introduction

Let D be a domain in C and f a meromorphic function on D. This allows us to explicitly write down solutions in terms of classical modular forms and functions.

Automorphic forms and equivariant functions
Automorphic differential equations
Finite image representations
The Frobenius method
Modular solutions
The reducible case
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