Non-perturbative effective model for the Higgs sector of the Standard Model

A non-perturbative effective model is derived for the Higgs sector of the standard model, described by a simple scalar theory. The renormalized couplings are determined by the derivatives of the Gaussian Effective Potential that are known to be the sum of infinite bubble graphs contributing to the vertex functions. A good agreement has been found with strong coupling lattice simulations when a comparison can be made

Detection of C3O in the low-mass protostar Elias 18

We have performed new laboratory experiments which gave us the possibility to obtain an estimate of the amount of carbon chain oxides (namely C3O2, C2O, and C3O) formed after irradiation (with 200 keV protons) of pure CO ice, at 16 K. The analysis of laboratory data indicates that in dense molecular clouds, when high CO depletion occurs, an amount of carbon chain oxides as high as 2-3x10^-3 with respect to gas phase carbon monoxide can be formed after ion irradiation of icy grain mantles. Then we have searched for gas phase C2O and C3O towards ten low-mass young stellar objects. Among these we have detected the C3O line at 38486.891 MHz towards the low-mass protostar Elias 18. On the basis of the laboratory results we suggest that in dense molecular clouds gas phase carbon chain oxides are formed in the solid phase after cosmic ion irradiation of CO-rich icy mantles and released to the gas phase after desorption of icy mantles. We expect that the Atacama Large Millimeter Array (ALMA), thanks to its high sensitivity and resolution, will increase the number of carbon chain oxides detected in dense molecular clouds.Comment: 19 Pages, 5 figures, Accepted to Ap

Light Higgs bosons from a strongly interacting Higgs sector

The mass and the decay width of a Higgs boson in the minimal standard model are evaluated by a variational method in the limit of strong self-coupling interaction. The non-perturbative technique provides an interpolation scheme between strong-coupling regime and weak-coupling limit where the standard perturbative results are recovered. In the strong-coupling limit the physical mass and the decay width of the Higgs boson are found to be very small as a consequence of mass renormalization. Thus it is argued that the eventual detection of a light Higgs boson would not rule out the existence of a strongly interacting Higgs sector.Comment: 2 figure

Analisis Keterkaitan Produktivitas Pertanian dan Impor Beras di Indonesia

This research titled “Analysis Causality of Agricultural Productivity and Import of Rice in Indonesia”. The purpose of this research is to know relationship between agricultural productivity and imported rice in Indonesia. The research uses secondary data from 1986 until 2012. The method of analisys are Unit Root Test, Ordinary Least Square, and Grager Causality. This data is processed by using the program eviews 7.1. The results of the research show that there is a reciprocal relationship (causality) between agricultural productivity and imported rice in Indonesia, based on a simple regression test results indicate that there is a negative relationship between agricultural productivity and imported rice, and there is a negative relationship between imports of rice and agricultural productivity in Indonesia

PENGARUH PELATIHAN DAN SIKAP KEWIRAUSAHAAN TERHADAP PENDAPATAN PELAKU UMKM DI KOTA PONTIANAK

MSME actors need to make several efforts to strengthen and face the global market, such as improving the quality of human resources, and the entrepreneurial attitude of MSMEs. Pontianak City has a number of MSMEs that have risen to improve their lives through business development. This is supported by various Pontianak City training centers to improve the quality and human resources to run MSMEs. One of them is carried out by the Office of Investment, Manpower and PTSP of Pontianak City. The approach in this study is a quantitative approach with survey methods and path analysis techniques. The results showed that training (X1) had a direct effect on income (Y). The correlation value of 0.486 category is quite strong. The sig value is 0.046 < 0.05 with a large direct effect of 5.4289%. Training (X1) has a direct effect on Entrepreneurial Attitudes (X2). The correlation value is 0.424, the category is quite strong, the sig value is 0.000 <0.05, and the direct effect is 17.9776%. Entrepreneurial Attitude (X2) has a direct effect on Income (Y). The correlation value is 0.486, the category is quite strong, the sig value is 0.004 <0.05 with a large direct effect of 11.4921%. The equation for path analysis of the training variable on entrepreneurial attitudes is X2 = 0.424X1 + 0.821. The path analysis equation for the variable of Entrepreneurship Training and Attitude towards Income is Y = 0.233X1 + 0.339X2 + 0.764

Submillimeter Polarimetry with PolKa, a reflection-type modulator for the APEX telescope

Imaging polarimetry is an important tool for the study of cosmic magnetic fields. In our Galaxy, polarization levels of a few up to $\sim$10\% are measured in the submillimeter dust emission from molecular clouds and in the synchrotron emission from supernova remnants. Only few techniques exist to image the distribution of polarization angles, as a means of tracing the plane-of-sky projection of the magnetic field orientation. At submillimeter wavelengths, polarization is either measured as the differential total power of polarization-sensitive bolometer elements, or by modulating the polarization of the signal. Bolometer arrays such as LABOCA at the APEX telescope are used to observe the continuum emission from fields as large as \sim0\fdg2 in diameter. %Here we present the results from the commissioning of PolKa, a polarimeter for Here we present PolKa, a polarimeter for LABOCA with a reflection-type waveplate of at least 90\% efficiency. The modulation efficiency depends mainly on the sampling and on the angular velocity of the waveplate. For the data analysis the concept of generalized synchronous demodulation is introduced. The instrumental polarization towards a point source is at the level of $\sim0.1$\%, increasing to a few percent at the $-10$db contour of the main beam. A method to correct for its effect in observations of extended sources is presented. Our map of the polarized synchrotron emission from the Crab nebula is in agreement with structures observed at radio and optical wavelengths. The linear polarization measured in OMC1 agrees with results from previous studies, while the high sensitivity of LABOCA enables us to also map the polarized emission of the Orion Bar, a prototypical photon-dominated region

Gaussian Effective Potential and superconductivity

The Gaussian Effective Potential in a fixed transverse unitarity gauge is studied for the static three-dimensional U(1) scalar electrodynamics (Ginzburg-Landau phenomenological theory of superconductivity). In the broken-symmetry phase the mass of the electromagnetic field (inverse penetration depth) and the mass of the scalar field (inverse correlation length) are both determined by solution of the coupled variational equations. At variance with previous calculations, the choice of a fixed unitarity gauge prevents from the occurrence of any unphysical degree of freedom. The theory provides a nice interpolation of the experimental data when approaching the critical region, where the standard mean-field method is doomed to failure

A general interpolation scheme for thermal fluctuations in superconductors

We present a general interpolation theory for the phenomenological effects of thermal fluctuations in superconductors. Fluctuations are described by a simple gauge invariant extension of the gaussian effective potential for the Ginzburg-Landau static model. The approach is shown to be a genuine variational method, and to be stationary for infinitesimal gauge variations around the Landau gauge. Correlation and penetration lengths are shown to depart from the mean field behaviour in a more or less wide range of temperature below the critical regime, depending on the class of material considered. The method is quite general and yields a very good interpolation of the experimental data for very different materials.Comment: some misprints have been corrected in Eq.(15),(19); more references and comments have been adde