The genus-one Hasse principle violation conjecture

Let kk be a global field. A genus one curve over kk is a smooth projective curve of genus one, and an elliptic curve EE over kk is a genus one curve with a specified kk-rational point. Write  \fontencodingOT2\fontfamilywncyr\fontseriesm\fontshape\selectfontSh(k,E){\text{% {\fontencoding{OT2}\fontfamily{wncyr}\fontseries{m}\fontshape{n}% \selectfont Sh}}}(k,E) for the Shafarevich–Tate group of EE. A curve violates the Hasse Principle if it has points over every completion of kk but no kk-rational point.

Genus-one Hasse principle violation conjecture. For every global field kk, there exists a genus one curve C/kC_{/k} which violates the Hasse Principle. Equivalently, there exists an elliptic curve E/kE_{/k} with  \fontencodingOT2\fontfamilywncyr\fontseriesm\fontshape\selectfontSh(k,E)0{\text{% {\fontencoding{OT2}\fontfamily{wncyr}\fontseries{m}\fontshape{n}% \selectfont Sh}}}(k,E) \neq 0.

The conjecture asks whether every global field admits a locally soluble but globally insoluble genus one curve. The supplied text gives no resolution, so its status remains open.

Sources & referencesView supporting material

Primary source

Pete L. Clark, “Curves over global fields violating the Hasse Principle”, arXiv:0905.3459 (2009).

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