The structure of the group of conjugating automorphisms and the linear representation of the braid groups of some manifolds

Abstract

In this paper we describe the structure of a group of conjugating automorphisms $C_n$ of free group and prove that this structure is similar to the structure of a braid group $B_n$ with $n>1$ strings. We find the linear representation of group $C_n$. Also we prove that the braid group $B_n(S^2)$ of 2--sphere, mapping class group M(0,n) of the $n$--punctured 2--sphere and the braid group $B_3(P^2)$ of the projective plane are linear. Using result of J. Dyer, E. Formanek, E. Grossman and the faithful linear representation of Lawrence--Krammer of $B_4$ we construct faithful linear representation of the automorphism group $Aut(F_2)$.

arXiv comment24 pages

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• The virtual and universal braids
• On The Faithfulness of the extension of Lawrence-Krammer representation of the group of conjugating automorphisms C_3