No abstract

We construct quark mixing matrices within a group theoretic framework which is easily applicable to any number of generations. Familiar cases are retrieved and related, and it is hoped that our viewpoint may have advantages both phenomenologically and for constructing underlying mass matrix schemes.

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We find mehics admitting supercovariantly constant spinor fields in a sequence of supersymmetric theories of increasing complexity. With a dilaton with varying coupling, or with axion and dilaton in an SL(2, R)-invariant theory we find all slrch metrics: in SU(4) supergravity with axion and dilaton, we find dl such metrics subject to an extra restriction.

No abstract