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High rank elliptic curves with torsion group
Authors:Juliá  n Aguirre  Fernando Castañ  eda  Juan Carlos Peral
Institution:Departamento de Matemáticas, Universidad del País Vasco, Aptdo. 644, 48080 Bilbao, Spain ; Departamento de Matemáticas, Universidad del País Vasco, Aptdo. 644, 48080 Bilbao, Spain ; Departamento de Matemáticas, Universidad del País Vasco, Aptdo. 644, 48080 Bilbao, Spain
Abstract:We develop an algorithm for bounding the rank of elliptic curves in the family $y^2=x^3-B\,x$, all of them with torsion group $\mathbb{Z} /(2\,\mathbb{Z} )$and modular invariant $j=1728$. We use it to look for curves of high rank in this family and present four such curves of rank $13$ and $22$ of rank $12$.

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