CM Elliptic Analogue of the Coleman--Ihara Formula

Source abstract

The Soulé characters are Kummer characters constructed from cyclotomic units and also arising from the Galois action on the pro-$p$ geometric fundamental group of $\mathbb{P}^1\setminus\{0,1,\infty\}$. The Coleman--Ihara formula describes the restrictions of these characters to the local Galois group at $p$ as products of the Coates--Wiles homomorphisms and Kubota--Leopoldt $p$-adic $L$-values at positive odd integers. In this paper, we prove an elliptic analogue of this formula for elliptic curves with complex multiplication by the ring of integers of an imaginary quadratic field $K$. We consider certain Kummer characters associated with elliptic units, which we call elliptic Soulé characters. These characters are elliptic counterparts of the classical Soulé characters and also arise from the Galois action on the pro-$p$ geometric fundamental groups of once-punctured elliptic curves. For suitable pairs of positive integers $(i,j)$, we give an explicit description of their restrictions to the relevant local Galois groups as products of the two-variable Coates--Wiles homomorphisms introduced by Yager and the two-variable $p$-adic $L$-values of $K$.