Representation type for block algebras of Hecke algebras of classical type

Abstract

We find representation type of the cyclotomic quiver Hecke algebras of level two in affine type A. In particular, we have determined representation type for all the block algebras of Hecke algebras of classical type (except for characteristic two in type D), which has not been known for a long time. As an application of this result, we prove that block algebras of finite representation type are Brauer tree algebras whose Brauer trees are straight lines without exceptional vertex if the Hecke algebras are of classical type and the characteristic of the base field is odd. We conjecture that this statement should hold for Hecke algebras of exceptional type with bad primes invertible in the base field.