We compute the average size of 2-Selmer groups of the family of hyperelliptic curves
with a marked Weierstrass point over function fields. The result is obtained by a
geometric method which could be considered as a generalization of the one that was
used previously by Q. P. Ho, V. B. Le Hung, and B. C. Ngo (Math. Res. Lett.21:6
(2014), 1305–1339) to obtain the average size of 2-Selmer groups of elliptic
curves.
Keywords
2-Selmer group, hyperelliptic curve, function field