Pseudo Goldstone Bosons Phenomenology in Minimal Walking Technicolor

We construct the non-linear realized Lagrangian for the Goldstone Bosons associated to the breaking pattern of SU(4) to SO(4). This pattern is expected to occur in any Technicolor extension of the standard model featuring two Dirac fermions transforming according to real representations of the underlying gauge group. We concentrate on the Minimal Walking Technicolor quantum number assignments with respect to the standard model symmetries. We demonstrate that for, any choice of the quantum numbers, consistent with gauge and Witten anomalies the spectrum of the pseudo Goldstone Bosons contains electrically doubly charged states which can be discovered at the Large Hadron Collider.Comment: 25 pages, 5 figure

A Demonstration of Spectral and Spatial Interferometry at THz Frequencies

A laboratory prototype spectral/spatial interferometer has been constructed to demonstrate the feasibility of the double Fourier technique at Far Infrared (FIR) wavelengths (0.15 - 1 THz). It is planned to use this demonstrator to investigate and validate important design features and data processing methods for future astronomical FIR interferometer instruments. In building this prototype we have had to address several key technologies to provide an end-end system demonstration of this double Fourier interferometer. We report on the first results taken when viewing single slit and double slit sources at the focus of a large collimator used to simulate real sources at infinity. The performance of the prototype instrument for these specific field geometries is analyzed to compare with the observed interferometric fringes and to demonstrate image reconstruction capabilities.Comment: Accepted for publication in Applied Optic

La mutualità nel caregiving: una revisione della letteratura

Mutuality, considered the feeling of intimacy and the positive relationship between a caregiver and a arereceiver, is gaining an increasing interest in the international research arena, on the light of the socio-demographic changes and the increase in chronic degenerative diseases. The purpose of this article is to make a critical analysis of the literature on mutuality in order to identify its predictors and outcomes. A literature review was performed with the following databases: PubMed, CINAHL, PsycInfo, ASSIA and Pciological Abstract. Twenty articles were selected. From the critical analysis of the literature mutuality emerges as key variable in the process of caregiving and in the mental and physical health of the caregiver and carereceiver. In caregivers, high levels of mutuality are associated with less stress, depression and burden and a better quality of life and perceived health; in patients, high mutuality improves the recovery process from an illness, reduces anxiety and depression and improves the quality of life. Future studies aimed at the study of this variable also in the Italian population could support the development of programs to improve the quality of life of caregivers and carereceiver

Cosmic Microwave Background Temperature at Galaxy Clusters

We have deduced the cosmic microwave background (CMB) temperature in the Coma cluster (A1656, $z=0.0231$), and in A2163 ($z=0.203$) from spectral measurements of the Sunyaev-Zel'dovich (SZ) effect over four passbands at radio and microwave frequencies. The resulting temperatures at these redshifts are $T_{Coma} = 2.789^{+0.080}_{-0.065}$ K and $T_{A2163} = 3.377^{+0.101}_{-0.102}$ K, respectively. These values confirm the expected relation $T(z)=T_{0}(1+z)$, where $T_{0}= 2.725 \pm 0.002$ K is the value measured by the COBE/FIRAS experiment. Alternative scaling relations that are conjectured in non-standard cosmologies can be constrained by the data; for example, if $T(z) = T_{0}(1+z)^{1-a}$ or $T(z)=T_{0}[1+(1+d)z]$, then $a=-0.16^{+0.34}_{-0.32}$ and $d = 0.17 \pm 0.36$ (at 95% confidence). We briefly discuss future prospects for more precise SZ measurements of $T(z)$ at higher redshifts.Comment: 13 pages, 1 figure, ApJL accepted for publicatio

A Focusing Metamaterial Based Wollaston Prism

By using existing metal mesh technology we propose a new lens design that behaves in a similar way to a Wollaston Prism. That is, a device that separates out the two linear polarised states of the incident field and then focuses them separately on same focal plane. The design is an evolution of an existing GRIN lens based on the same technology. The proposed lens design has a diameter of 75mm while only being 2mm thick. This will focus two beams at a distance of 250mm with a separation of 10mm, over the frequency range of 100-200GHZ. Such a device would be useful where space and weight are an issue and would allow the use of incoherent detectors

Observing CMB polarisation through ice

Ice crystal clouds in the upper troposphere can generate polarisation signals at the uK level. This signal can seriously affect very sensitive ground based searches for E- and B-mode of Cosmic Microwave Background polarisation. In this paper we estimate this effect within the ClOVER experiment observing bands (97, 150 and 220 GHz) for the selected observing site (Llano de Chajnantor, Atacama desert, Chile). The results show that the polarisation signal from the clouds can be of the order of or even bigger than the CMB expected polarisation. Climatological data suggest that this signal is fairly constant over the whole year in Antarctica. On the other hand the stronger seasonal variability in Atacama allows for a 50% of clean observations during the dry season.Comment: 7 Pages, 4 figure

Transmission Properties of Subwavelength Planar Fractals for THz Wavelengths

We investigate the transmission properties of planar H fractal structures in THz range. 3D EM simulations using HFSS are used to design the parameters of the fractals and to evaluate the optical properties. We observe the transmission spectra with pass bands and stop bands, which show the subwavelength transmission through the non-metallic gaps. This unique transmission property through subwavelength apertures makes it potentially useful frequency selective components in THz region. We experimentally demonstrate its behavior by designing and fabricating four prototype planar fractals in the range of 0-1.5THz and characterize using a polarizing Fourier transform spectrometer. We find good agreement between the models and measurements

Suspensão da irrigação durante a maturação de uvas 'Niágara Rosada'.

Na região noroeste de São Paulo, a videira Niágara Rosada (Vitis labrusca) tem sido uma das principais cultivares adotadas pelos produtores locais. Todas as áreas vitícolas, nessa região, são irrigadas devido ao déficit hídrico que ocorre durante o período de produção da cultura. Diversas técnicas podem ser empregadas com o propósito de aumentar a eficiência do uso da água, sendo que a irrigação com déficit hídrico tem sido uma das mais adotadas para a cultura da videira. No presente trabalho, avaliou-se o efeito de diferentes épocas de suspensão da irrigação durante a fase de maturação de uvas da cultivar ?Niágara Rosada? (Vitis labrusca), sob as condições do noroeste paulista. O experimento foi conduzido em área da Estação Experimental de Viticultura Tropical da Embrapa Uva e Vinho, localizada no município de Jales, noroeste do estado de São Paulo. As plantas de ?Niágara Rosada? sobre porta-enxertos ?IAC 572? foram conduzidas no sistema latada e irrigadas por microaspersão. O delineamento estatístico foi em blocos ao acaso com quatro tratamentos e cinco repetições. Os tratamentos avaliados foram: suspensão da irrigação aos 21 dias (T1), 15 dias (T2) e 9 dias (T3) antes da colheita, e irrigação até o final do ciclo da cultura (T4). Foram avaliadas variáveis relacionadas à qualidade dos frutos, como teor de sólidos solúveis, pH, tamanho de bagas e massa de cachos e bagas. Durante o período de avaliação, não ocorreram precipitações pluviais no local do experimento. Não foram encontradas diferenças significativas pelo teste de Tukey, ao nível de 5% de probabilidade, para as variáveis avaliadas. A suspensão da irrigação aos 21 dias (T1) apresentou uma economia de água de 21% em relação ao total aplicado no tratamento sem suspensão da irrigação (T4)

Multimode simulations of a wide field of view double-Fourier far-infrared spatio-spectral interferometer

In the absence of 50-m class space-based observatories, subarcsecond astronomy spanning the full far-infrared wavelength range will require space-based long-baseline interferometry. The long baselines of up to tens of meters are necessary to achieve subarcsecond resolution demanded by science goals. Also, practical observing times command a field of view toward an arcminute (1′) or so, not achievable with a single on-axis coherent detector. This paper is concerned with an application of an end-to-end instrument simulator PyFIInS, developed as part of the FISICA project under funding from the European Commission’s seventh Framework Programme for Research and Technological Development (FP7). Predicted results of wide field of view spatio–spectral interferometry through simulations of a long-baseline, double-Fourier, far-infrared interferometer concept are presented and analyzed. It is shown how such an interferometer, illuminated by a multimode detector can recover a large field of view at subarcsecond angular resolution, resulting in similar image quality as that achieved by illuminating the system with an array of coherent detectors. Through careful analysis, the importance of accounting for the correct number of higher-order optical modes is demonstrated, as well as accounting for both orthogonal polarizations. Given that it is very difficult to manufacture waveguide and feed structures at sub-mm wavelengths, the larger multimode design is recommended over the array of smaller single mode detectors. A brief note is provided in the conclusion of this paper addressing a more elegant solution to modeling far-infrared interferometers, which holds promise for improving the computational efficiency of the simulations presented here