In the top-down approach to multi-name credit modeling, calculation of singe name sensitivities appears possible, at least in principle, within the so-called random thinning (RT) procedure which dissects the portfolio risk into individual contributions. We make an attempt to construct a practical RT framework that enables efficient calculation of single name sensitivities in a top-down framewor...

We consider a class of models in which supersymmetry breaking is communicated dominantly via a U1' gauge interaction, which also helps solve the mu problem. Such models can emerge naturally in top-down constructions and are a version of split supersymmetry. The spectrum contains heavy sfermions, Higgsinos, exotics, and Z' approximately 10-100 TeV, light gauginos approximately 100-1000 GeV, a li...

Nine 20M⊙ models were computed with metallicities ranging from solar, through Z = 10 ([Fe/H]∼-3.1) down to Z = 10 ([Fe/H]∼-6.1) and with initial rotational velocities between 0 and 600 km s to study the impact of initial metallicity and rotational velocity Hirschi (2006). The very large amounts of N observed (∼0.03M⊙) are only produced at Z = 10 (PopII 1/2). The strong dependence of the N yield...