Supersymmetric Extension of the Minimal Dark Matter Model

The minimal dark matter model is given a supersymmetric extension. A super SU(2)L quintuplet is introduced with its fermionic neutral component still being the dark matter, the dark matter particle mass is about 19.7 GeV. Mass splitting among the quintplet due to supersymmetry particles is found to be negligibly small compared to the electroweak corrections. Other properties of this supersymmetry model are studied, it has the solutions to the PAMELA and Fermi-LAT anomaly, the predictions in higher energies need further experimental data to verify.Comment: 14 pages, 7 figures, accepted for publication in Chinese Physics C, typos correcte

L\u2019 Etna: un percorso attraverso l\u2019immaginario, la consapevolezza del rischio e la gestione del territorio\u201d,

anche in, Annali della Facolt\ue0 di Economia, Catania, anno L, 2004

Sustainable development of Sicily east coast

Sicily has an unusual coastal reality: widespread illegal building, industrial pollution, abandonment, under-valued unique sites with strong natural, tourist, cultural and economic potential. A common topic nowadays is the integrated management of the coastal area for a sustainable development. The aspects to consider are many: administrative, managerial, juridical, political, scientific, planning and so on. These aspects will be important both in the realization of operational interventions for the recovery of degraded areas and of eco-compatible planning. It will be necessary to tie the economic development to the maintenance of the environment according to the recent directives of the European Union that point out - in the principles of sustainable development - the guidelines for community politics. In this paper we will focus on the problems of the eastern Sicilian coastal zone (with particular attention paid to coastal protection and port/harbour management) and the opportunities that marine tourism can offer to local development in general

The Casimir force on a surface with shallow nanoscale corrugations: Geometry and finite conductivity effects

We measure the Casimir force between a gold sphere and a silicon plate with nanoscale, rectangular corrugations with depth comparable to the separation between the surfaces. In the proximity force approximation (PFA), both the top and bottom surfaces of the corrugations contribute to the force, leading to a distance dependence that is distinct from a flat surface. The measured Casimir force is found to deviate from the PFA by up to 15%, in good agreement with calculations based on scattering theory that includes both geometry effects and the optical properties of the material

Can multistate dark matter annihilation explain the high-energy cosmic ray lepton anomalies?

Multistate dark matter (DM) models with small mass splittings and couplings to light hidden sector bosons have been proposed as an explanation for the PAMELA/Fermi/H.E.S.S. high-energy lepton excesses. We investigate this proposal over a wide range of DM density profiles, in the framework of concrete models with doublet or triplet dark matter and a hidden SU(2) gauge sector that mixes with standard model hypercharge. The gauge coupling is bounded from below by the DM relic density, and the Sommerfeld enhancement factor is explicitly computable for given values of the DM and gauge boson masses M, mu and the (largest) dark matter mass splitting delta M_{12}. Sommerfeld enhancement is stronger at the galactic center than near the Sun because of the radial dependence of the DM velocity profile, which strengthens the inverse Compton (IC) gamma ray constraints relative to usual assumptions. We find that the PAMELA/Fermi/H.E.S.S. lepton excesses are marginally compatible with the model predictions, and with CMB and Fermi gamma ray constraints, for M ~ 800 GeV, mu ~ 200 MeV, and a dark matter profile with noncuspy Einasto parameters alpha > 0.20, r_s ~ 30 kpc. We also find that the annihilating DM must provide only a subdominant (< 0.4) component of the total DM mass density, since otherwise the boost factor due to Sommerfeld enhancement is too large.Comment: 20 pages, 12 figures; v2: Corrected branching ratio for ground state DM annihilations into leptons, leading to boost factors that are larger than allowed. Added explicit results for doublet DM model. Some conclusions changed; main conclusion of tension between inverse Compton constraints and N-body simulations of halo profiles is unchange

Vanadium in animal drinking water of dairy farms from Southeast Córdoba, Argentina

En este trabajo se cuantificaron los niveles de vanadio presentes en el agua de bebida animal de25 establecimientos lecheros, ubicados en el departamento de Unión, sudeste de la provinciade Córdoba, Argentina. Además, se cuantificaron sólidos totales disueltos (STD) e ionesmayoritarios, a fin de determinar la calidad del agua con la que se abastecen los tambos relevados.A partir de los datos analizados, se evidenció que el 48% de los mismos se abastece de la capafreática, cuya calidad es inferior al agua proveniente de pozos más profundos. Asimismo seobservó que la totalidad de las muestras de nivel freático superaban los valores máximos devanadio recomendados para agua de bebida animal, alcanzándose niveles superiores a los 6mg/L; y que las muestras con los niveles más bajos de vanadio presentaban, en contraposición,concentraciones elevadas de cloruros y sulfatos. Respecto de las aguas provenientes de pozossemisurgentes, menos del 10% de las muestras presentaban niveles de vanadio superiores a losestablecidos, no alcanzándose en ningún caso valores por encima de los 0,3 mg/L. El presenteestudio sugiere entonces que el agua procedente de la capa freática no sería segura paraaprovisionamiento de los animales.In this paper, vanadium levels, in animal drinking water, were quantified in water samples from 25 dairy farms located in the department of Union, southeast of the province of Cordoba, Argentina. In addition, total dissolved solids (TDS) and major ions were considered in order to determine the quality of water source used for livestock. Analyzed data showed that 48% of farms use a groundwater from the freatic aquifer (3 to 15 m), for animal drinking water, whose quality is worst than water from deeper wells (80 to 120 m). It was also noted that all the samples from the freatic aquifer exceeded the maximum vanadium levels considered for animal drinking water, reaching more than 6 mg/L. Regarding the water from deeper wells, less than 10% of them have vanadium concentrations above the recommended level, presenting a maximum level of 0.3 mg/L. The present study suggests that the water from the freatic aquifer would not be safe for use as water for livestock drinking; because of the levels of vanadium, arsenic, fluoride, chloride and sulphate.Fil: Pérez Carrera, Alejo Leopoldo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Unidad Ejecutora de Investigaciones en Produccion Animal; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Veterinarias. Centro de Estudios Transdisciplinarios del Agua; ArgentinaFil: Alvarez Gonçalvez, C. V.. Universidad de Buenos Aires. Facultad de Ciencias Veterinarias. Centro de Estudios Transdisciplinarios del Agua; ArgentinaFil: Fernandez Cirelli, Alicia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Unidad Ejecutora de Investigaciones en Produccion Animal; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Veterinarias. Centro de Estudios Transdisciplinarios del Agua; Argentin