Effective gravity and OSp(N,4) invariant matter

Abstract

We re-examine the OSp(N,4) invariant interacting model of massless chiral and gauge superfields, whose superconformal invariance was instrumental, both in proving the all-order no-renormalization of the mass and chiral self-interaction lagrangians, and in determining the linear superfield renormalization needed. We show that the renormalization of the gravitational action modifies only the cosmological term, without affecting higher-order tensors. This could explain why the effect of the cosmological constant is shadowed by the effects of newtonian gravity.

12 pages, LaTeX, 4 figures, PACS: 04.65.+e, substantial revisions, to appear in Phys. Rev. D