ar X iv : h ep - t h / 04 06 26 2 v 1 2 9 Ju n 20 04 RIKEN

ar X iv : h ep - p h / 04 06 26 4 v 1 2 3 Ju n 20 04 IPPP / 04 / 05 DCTP / 04 / 10 Top flavour violating decays in general supersymmetric models

We analyse the top flavour violating decays in general supersymmetric model using the mass insertion approximation. In particular, we discuss the impact of a light right-handed top-squark and large mixing between the first or second and third generation of up-squarks on processes as t → qγ, g. We also take into account the relevant experimental constraints from B-physics and the requirements fo...

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ar X iv : h ep - t h / 04 06 22 1 v 1 2 4 Ju n 20 04 LAPTH Laboratoire d ’ Annecy - le - Vieux de Physique Théorique A CLASS OF TOPOLOGICAL ACTIONS

We review definitions of generalized parallel transports in terms of Cheeger-Simons differential characters. Integration formulae are given in terms of Deligne-Beilinson cohomology classes. These representations of parallel transport can be extended to situations involving distributions as is appropriate in the context of quantized fields. LAPTH-750/99 SPhT-T04/080

ar X iv : h ep - t h / 04 07 26 6 v 1 2 9 Ju l 2 00 4 Cosmic Natural Selection

I make a number of comments about Smolin's theory of Cosmic Natural Selection.

ar X iv : h ep - t h / 04 06 15 4 v 2 1 9 Ju n 20 04 Characters of the Positive Energy UIRs of D = 4 Conformal Supersymmetry

We give character formulae for the positive energy unitary irreducible representations of the N-extended D=4 conformal superalgebras su(2,2/N). Using these we also derive decompositions of long superfields as they descend to the unitarity threshold. These results are also applicable to irreps of the complex Lie superalgebras sl(4/N). Our derivations use results from the representation theory of...