Abstract.Let m, n ∈ ,ގ V be a 2m-dimensional complex vector space. The irreducible representations of the Brauer's centralizer algebra B n (−2m) appearing in V ⊗n are in 1-1 correspondence to the set of pairs ( f, λ), where f ∈ ޚ with 0 ≤ f ≤ [n/2], and λ n − 2f satisfying λ 1 ≤ m. In this paper, we first show that each of these representations has a basis consists of eigenvectors for the subalgebra of B n (−2m) generated by all the Jucys-Murphy operators, and we determine the corresponding eigenvalues. Then we identify these representations with the irreducible representations constructed from a cellular basis of B n (−2m). Finally, an explicit description of the action of each generator of B n (−2m) on such a basis is also given, which generalizes earlier work of [15] for Brauer's centralizer algebra B n (m).2000 Mathematics Subject Classification. 16G99.
Introduction.Let m, n ∈ ,ގ V be a m-dimensional (resp. 2m-dimensional) complex vector space with a non-degenerate symmetric (resp. skew) bilinear form. Then V defines the orthogonal group O(V ) (resp. symplectic group Sp(V )), the invertible linear transformations which preserve this form.In order to study how the n-tensor space V ⊗n decompose into irreducible modules over O(V ) or Sp(V ), Richard Brauer (see [1]) introduced a number of complex associative algebras B n (x) which are now called the Brauer's centralizer algebras. These algebras are finite-dimensional algebras indexed by a positive integer n and a complex number x.One takes x = m in the orthogonal case, and x = −2m in the symplectic case. Then there is a right action of B n (x) on the corresponding n-tensor space V ⊗n , such that it generates the centralizer algebra End O(V ) (V ⊗n ) or End Sp(V ) (V ⊗n ).