Supersymmetry Breaking, Extra Dimensions and Neutralino Dark Matter

We show some phenomenological implications for the dark matter problem of a class of models with deflected anomaly mediated supersymmetry breaking in the context of the MSSM. This scenario can be naturally embedded in a brane world model with one compactified extra dimension. It turns out that in these models the neutralino is still the LSP and so a good candidate as cold dark matter. We found that the neutralino is quite a pure bino in almost all the parameter space. Moreover we computed the thermal relic density and we found wide cosmologically allowed regions for the neutralino.Comment: 9 pages, 5 figures; typos removed and some minor correction. Talk given at the Third Workshop on Science with the New Generation of High Energy Gamma-ray Experiments Cividale del Friuli, Italy - May 30-31 and June 1, 200

Quark mass hierarchies in D-brane realizations of the Standard Model

This proceeding is based on arXiv:0905.3044. We analyze the problem of the hierarchy of masses and mixings in orientifold realizations of the Standard Model. We present a bottom-up brane configuration that can generate such hierarchies.Comment: Prepared for the 9th Hellenic School on Elementary Particle Physics (CORFU2009), Corfu, Greece, 30 Aug - 20 Sep 2009. To be published in Fortsch.Phys. 8 pages, 1 figure, LaTe

Deflected Anomaly Mediation and Neutralino Dark Matter

We study the phenomenology of the neutralino dark matter in the so called deflected anomaly mediation scenario. This scheme is obtained from the minimal anomaly mediated scenario by introducing a gauge mediated sector with $N_f$ messenger fields. Unlike the former scheme the latter has no tachyons. We find that the neutralino is still the LSP in a wide region of the parameter space: it is essentially a pure bino in the scenario with $N_f=1$ while it can also be a pure higgsino for $N_f>1$. This is very different from the naive anomaly mediated scenario which predicts a wino like neutralino. Moreover we do not find any tachyonic scalars in this scheme. After computing the relic density (considering all the possible coannihilations) we find that there are regions in the parameter space with values compatible with the latest WMAP results with no need to consider moduli fields that decay in the early universe.Comment: 23 pages, 6 figures, submitted to Phys. Rev.

WIMP Gamma Rays From the Galactic Center with GLAST and Accelerator Comparison

We will describe the prospects for detecting gamma-rays from WIMP's annihilation in the Galactic Center and we compare this search with the possibilities at LHC and with space antimatter experiments like PAMELA.Comment: 3 pages, 6 figure

WIMP Gamma Rays From the Galactic Center with GLAST and Accelerator Comparison

We will describe the prospects for detecting gamma-rays from WIMP's annihilation in the Galactic Center and we compare this search with the possibilities at LHC and with space antimatter experiments like PAMELA.Comment: 3 pages, 6 figure