On a two-parameter family of tropical Edwards curves

Hiroaki Nakamura; Rani Sasmita Tarmidi

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arXiv · 2307.02093

On a two-parameter family of tropical Edwards curves

Hiroaki Nakamura·Rani Sasmita Tarmidi

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Abstract

In this paper, a certain two-parameter family of plane-embeddings of Edwards elliptic curve $E_a: x^2+y^2=a^2(1+x^2y^2)$ is introduced to provide explicitly computed tropical curves corresponding to degeneration in $a\to 1$. Applying the theta uniformization of $E_a$ with the method of ultradiscretization by Kajiwara-Kaneko-Nobe-Tsuda, we give a formula for the coordinate functions that traces the cycle part of the tropical elliptic curve. We also illustrate how one can recover the whole part of the tropical curve as a quotient of the Bruhat-Tits tree after Speyer's algebraic approach in smooth cases.

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Hiroaki Nakamura, Rani Sasmita Tarmidi. 2023-07-05. On a two-parameter family of tropical Edwards curves. https://arxiv.org/abs/2307.02093

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