Compatible Feigin-Odesskii Poisson brackets

Abstract

We prove that several Feigin-Odesskii Poisson brackets associated with normal elliptic curves in ${\mathbb{P}}^n$ are compatible if and only if they are contained in a scroll or in a Veronese surface in ${\mathbb{P}}^5$ (with an exception of one case when $n=3$). In the case $n=3$ we determine the quartic corresponding to the Schouten bracket of two (non-compatible) Poisson brackets associated with normal elliptic curves $E_1$ and $E_2$.

15 pages, v2: strengthened Corollary C for even n