To every irreducible finite crystallographic reflection group (i.e., an
irreducible finite reflection group G acting faithfully on an abelian variety
X), we attach a family of classical and quantum integrable systems on X (with
meromorphic coefficients). These families are parametrized by G-invariant
functions of pairs (T,s), where T is a hypertorus in X (of codimension 1), and
s in G is a reflection acting trivially on T. If G is a real reflection group,
these families reduce to the known generalizations of elliptic Calogero-Moser
systems, but in the non-real case they appear to be new.
The present notes are based on a course on Cherednik algebras given by the
first author at MIT in the Fall of 2009. Their goal is to give an introduction
to Cherednik algebras, and to review the web of connections between them and
other mathematical objects.
We build representations of the affine and double affine braid groups and
Hecke algebras of type $(C^\vee_n,C_n)$, based upon the theory of quantum
symmetric pairs $(U,B)$. In the case $U=U_q(gl_N)$, our constructions provide a
quantization of the representations constructed by Etingof, Freund and Ma in
arXiv:0801.1530, and also a type $BC$ generalization of the results in
arXiv:0805.2766.