VANISHING INDUCED COSMOLOGICAL CONSTANT IN ELEMENTARY-PARTICLE THEORY

The quest for a vanishing cosmological constant is considered in the s implest anomaly-free chiral gauge extension of the electroweak standar d model. New physics is restricted to a well-defined additional flavor dynamics above the Fermi scale, namely up to a few TeVs, and an extend ed Higgs structure. In contrast to the electroweak standard model, it is shown how the scalar sector of the theory allows a vanishing-induce d vacuum energy density. The details of the cancellation mechanism are presented. At accessible energies the theory is indistinguishable fro m the standard model of elementary particles and is in agreement with all existing data.