Linear spectrum of OSp(32/1) Chern-Simons supergravity in eleven dimensions

We study linearized perturbations of eleven-dimensional OSp(32/1) Chern-Simons supergravity. The action contains a term that changes the value of the cosmological constant, as considered by Horava [Phys. Rev. D 59, 046004 (1999)]. It is shown that the spectrum contains a three-form and a six-form whose field strengths are dual to each other, thus providing a link with the eleven-dimensional supergravity of Cremmer et al. [Phys. Lett. 76B, 409 (1978)]. The linearized equations for the graviton and Rarita-Schwinger fields are shown to be the standard ones as well.