Constructing families of elliptic curves with prescribed mod 3   representation via Hessian and Cayleyan curves
  For a given elliptic curve $E_0$ defined over a number field $k$, we construct two families of elliptic curves whose mod 3 representations are isomorphic to that of $E_0$. The isomorphisms in the first family are symplectic, and those in the second family are anti-symplectic. Our construction is based on the notion of Hessian and Cayleyan curves in classical geometry. 
Masato Kuwata
math.NT math.AG