Braid groups in handlebodies and corresponding Hecke algebras

Abstract

In this paper we study the kernel of the homomorphism $B_{g,n}\to B_n$ of the braid group $B_{g,n}$ in the handlebody ${\mathcal{H}}_g$ to the braid group $B_n$. We prove that this kernel is a semi-direct product of free groups. Also, we introduce an algebra $H_{g,n}(q)$, which is some analog of the Hecke algebra $H_n(q)$, constructed by the braid group $B_n$.

15 pages, corrected versiov