Exactness of Cuntz-Pimsner C*-algebras

Let H be a full Hilbert bimodule over a C*-algebra A. We show that the Cunt z-Pimsner algebra associated to H is exact if and only if A is exact. Using this result, we give alternative proofs for exactness of reduced amalgamat ed free products of exact C*-algebras. In the case in which A is a finite-d imensional C*-algebra, we also show that the Brown-Voiculescu topological e ntropy of Bogljubov automorphisms of the Cuntz-Pimsner algebra associated t o an A, A Hilbert bimodule is zero.