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We re-examine the OSp(N,4) invariant interacting model of massless chiral andgauge superfields, whose superconformal invariance was instrumental, both inproving the all-order no-renormalization of the mass and chiralself-interaction lagrangians, and in determining the linear superfieldrenormalization needed. We show that the renormalization of the gravitationalaction modifies only the cosmological term, without affecting higher-ordertensors. This could explain why the effect of the cosmological constant isshadowed by the effects of newtonian gravity.Comment: 12 pages, LaTeX, 4 figures, PACS: 04.65.+e, substantial revisions, to  appear in Phys. Rev.

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Effective gravity and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">OSp</mml:mi><mml:mn /><mml:mo>(</mml:mo><mml:mi>N</mml:mi><mml:mo>,</mml:mo><mml:mn>4</mml:mn><mml:mn /><mml:mo>)</mml:mo><mml:mn /></mml:math>-invariant matter

Effective gravity andOSp(N,4)-invariant matter