Quantum M-2 -> 2 Lambda/3 discontinuity for massive gravity with a Lambda term

In a previous paper we showed that the absence of the van Dam-Veltman-Zakha rov discontinuity as M-2 --> 0 for massive spin 2 with a Lambda term is an artifact of the tree approximation, and that the discontinuity reappears at one loop, as a result of going from five degrees of freedom to two. In thi s Letter we show that a similar classical continuity but quantum discontinu ity arises in the "partially massless" limit M-2 --> 2 Lambda /3, as a resu lt of going from five degrees of freedom to four. (C) 2001 Published by Els evier Science B.V.