Elliptic Curves x3 + y3 = k of High Rank
We use rational parametrizations of certain cubic surfaces and an explicit formula for descent via 3-isogeny to construct the first examples of elliptic curves E k : x 3 + y 3 = k of ranks 8, 9, 10, and 11 over ℚ. As a corollary we produce examples of elliptic curves over ℚ with a rational 3-torsion point and rank as high as 11. We also discuss the problem of finding the minimal curve E k of a given rank, in the sense of both |k| and the conductor of E k , and we give some new results in this direction. We include descriptions of the relevant algorithms and heuristics, as well as numerical data.
KeywordsElliptic Curve Elliptic Curf Diophantine Equation Point Search Independent Point
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