Refined Kodaira classes and conductors of twisted elliptic curves
Volume 463 / 2009
Dissertationes Mathematicae 463 (2009), 1-45
MSC: Primary 11G05; Secondary 11G07, 14H52.
DOI: 10.4064/dm463-0-1
Abstract
We consider elliptic curves defined over $\Q.$ It is known that for a prime $p>3$ quadratic twists permute the Kodaira classes, and curves belonging to a given class have the same conductor exponent. It is not the case for $p=2$ and 3. We establish a refinement of the Kodaira classification, ensuring that the permutation property is recovered by {\it refined} classes in the cases $p=2$ and 3. We also investigate the nonquadratic twists. In the last part of the paper we discuss the number of isogeny classes of curves for given conductors of some special forms. Representative numerical data are given in the tables.
