On Gravitino properties in a Conformal Supergravity Model

In the context of a conformal Supergravity (SUGRA) model in the Einstein frame, in which the (next to) minimal supersymmetric standard model can embedded naturally to produce chaotic inflation scenarios, we study properties of gravitino in the cases where it is stable or unstable. In the latter case, we demonstrate that for large dilaton scale factors there is an enhanced magnitude of the gravitino width, when it decays to neutralino dark matter, as compared with the standard SUGRA case. In this context, we discuss the associated consequences as far as Big Bang Nucleosynthesis constraints and avoidance of gravitino overproduction are concerned.Comment: 7 pages latex, two eps figures incorporate

High-Energy Constraints on the Direct Detection of MSSM Neutralinos

The requirement that the MSSM remain an acceptable effective field theory up to energies beyond the weak scale constrains the sparticle spectrum, and hence the permissible ranges of cold dark matter neutralino-proton cross sections. Specifically, squarks are generally much heavier than sleptons if no tachyons are to appear before the GUT scale ~10^16 GeV, or even before 10 TeV. We display explicitly the allowed ranges of effective squark and slepton masses at the weak scale, and the cross-section ranges allowed if the MSSM is to remain valid without tachyons up to 10 TeV or the GUT scale. The allowed areas in the cross section-mass plane for both spin-independent and spin-dependent scattering are significantly smaller than would be allowed if the MSSM were required to be valid only around the weak scale. In addition to a reduction in the maximum cross section, the upper limit on the neutralino mass is greatly reduced when tachyons are avoided, particularly for smaller values of the squark masses.Comment: 22 pages, 22 figure

Gravitino Dark Matter

We will discuss issues on gravitino dark matter models, especially after the resent experimental results from the LHC and from experiments that are looking for dark matter either directly or indirectly. After reviewing details of this scenario, we will examine possible future research directions

Partially Protected Left Main Stenting in a Patient with Complete Obstruction of Left Internal Mammary Graft

We present a 59-year-old patient with a previous history of coronary artery bypass grafting (CABG) for left main and mid-left anterior descending (LAD) coronary artery disease with the use of left internal mammary artery (LIMA) and a radial graft six years ago. He performed a treadmill stress test which documented extensive ischemia in V2-V6 precordial leads with significant blood pressure drop. Coronary angiogram revealed complete obstruction of the LIMA and patent radial graft. The patient preferred percutaneous intervention (PCI) to CABG as a revascularization strategy. The procedure was guided by intravascular ultrasound. We implanted two drug eluting stents, the first one in the mid-LAD overlapped with the second one which covered the vessel up to the ostium of the left main. Significant plaque shift to the ostium of the left circumflex was treated with a kissing balloon techniqu