The Modular number, Congruence number, and Multiplicity One

Details The Modular number, Congruence number, and Multiplicity One The Modular number, Congruence number, and Multiplicity One

2008-10-29

arxiv.org/abs/0810.5176v1

Mathematics

Number Theory

Scientific paper

Let $N$ be a positive integer and let $f$ be a newform of weight 2 on $\Gamma_0(N)$. In earlier joint work with K. Ribet and W. Stein, we introduced the notions of the modular number and the congruence number of the quotient abelian variety $A_f$ of $J_0(N)$ associated to the newform $f$. These invariants are analogs of the notions of the modular degree and congruence primes respectively associated to elliptic curves. We show that if $p$ is a prime such that every maximal ideal of the Hecke algebra of characteristic $p$ that contains the annihilator ideal of $f$ satisfies multiplicity one, then the modular number and the congruence number have the same $p$-adic valuation.

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