Thick brane in 7D and 8D spacetimes

We consider a thick brane model supported by two interacting scalar fields in 7D and 8D general relativity. Using the special type of a potential energy, we obtain numerically the regular asymptotically flat vacuum solutions. A possibility of obtaining the similar solutions for an arbitrary number of the extra spatial dimensions is estimated.Comment: 3 Ref's are adde

Topological Defects as Seeds for Eternal Inflation

We investigate the global structure of inflationary universe both by analytical methods and by computer simulations of stochastic processes in the early Universe. We show that the global structure of the universe depends crucially on the mechanism of inflation. In the simplest models of chaotic inflation the Universe looks like a sea of thermalized phase surrounding permanently self-reproducing inflationary domains. In the theories where inflation occurs near a local extremum of the effective potential corresponding to a metastable state, the Universe looks like de Sitter space surrounding islands of thermalized phase. A similar picture appears even if the state $\phi = 0$ is unstable but the effective potential has a discrete symmetry $\phi \to =-\phi$. In this case the Universe becomes divided into domains containing different phases. These domains will be separated from each other by domain walls. However, unlike ordinary domain walls, these domain walls will inflate, and their thickness will exponentially grow. In the theories with continuous symmetries inflation generates exponentially expanding strings and monopoles surrounded by thermalized phase. Inflating topological defects will be stable, and they will unceasingly produce new inflating topological defects. This means that topological defects may play a role of indestructible seeds for eternal inflation.Comment: 21 pages, 17 figures (not included), Stanford University preprint SU--ITP--94--

Domain Wall Spacetimes: Instability of Cosmological Event and Cauchy Horizons

The stability of cosmological event and Cauchy horizons of spacetimes associated with plane symmetric domain walls are studied. It is found that both horizons are not stable against perturbations of null fluids and massless scalar fields; they are turned into curvature singularities. These singularities are light-like and strong in the sense that both the tidal forces and distortions acting on test particles become unbounded when theses singularities are approached.Comment: Latex, 3 figures not included in the text but available upon reques

Caracterización de harinas de tritíceas híbridas

Triticales (x Triticosecale Wittmack) y tricepiros (x Triticosecale Witt. X x Agrotricum A. Camus) se mejoran con la finalidad de obtener cultivares de doble propósito (forraje y grano). Para su utilización en consumo humano, la calidad de las harinas de triticales es frecuentemente evaluada midiendo el diámetro y factor de expansión de las galletitas horneadas. Estos indicadores están fuertemente relacionados al contenido de almidón dañado, proteína y polisacáridos no amiláceos de la harina que determinan sus propiedades de absorción de agua. Se evaluaron 25 líneas experimentales, ocho cultivares de triticale y uno de tricepiro en Santa Rosa, La Pampa, Argentina, durante 2012, mediante análisis de correlación simple y de conglomerados. Se observaron correlaciones positivas entre los valores de la capacidad de retención del solvente agua, carbonato de sodio, ácido láctico y sacarosa, índice de retención de agua alcalina, pentosanos solubles y almidón dañado. La caracterización de las harinas y la separación en grupos según sus propiedades fisicoquímicas permitieron la selección de genotipos con diferentes propiedades funcionales. En el análisis de conglomerados, el cluster 1 agrupó los materiales con mejores características fisicoquímicas de las harinas, lo cual aumenta las posibilidades de su empleo en la alimentación humana.Triticales (x Triticosecale Wittmack) and Tricepiros (x Triticosecale Witt. X x Agrotricum A. Camus) are improved in order to obtain dual-purpose cultivars (forage and grain). In order to use them for human consumption the quality of triticale four is frequently evaluated by measuring the diameter and spread factor of cookies. These indicators are strongly related to the contents of damaged starch, protein and non-starch polysaccharides of four, which determine its water absorption properties. During 2012, twenty-five experimental strains, eight triticale and one tricepiro cultivars were evaluated in Santa Rosa, La Pampa, Argentina by means of simple correlation and cluster analysis. Positive correlations between the values of solvent retention capacity of water, sodium carbonate, lactic acid and sucrose, retention rate of alkaline water, soluble pentosans and damaged starch were observed. The characterization of the tested fours and their differentiation based on their physicochemical properties allowed the selection of genotypes with different functional properties. In the cluster analysis, cluster 1 pooled the materials with the best physicochemical features of four, which increases the possibilities of its use for human consumption.Fil: Castaño, M. N.. Universidad Nacional de La Pampa. Facultad de Agronomía; ArgentinaFil: Ferrari, E. D.. Universidad Nacional de La Pampa. Facultad de Agronomía; ArgentinaFil: Picca, Aurora Maria Teresita. Universidad Nacional de La Pampa. Facultad de Agronomía; ArgentinaFil: Curti, María Isabel. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Ciencias de la Tierra y Ambientales de La Pampa. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales. Instituto de Ciencias de la Tierra y Ambientales de La Pampa; ArgentinaFil: Ribotta, Pablo Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Ciencia y Tecnología de Alimentos Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Ciencia y Tecnología de Alimentos Córdoba; Argentina. Universidad Nacional de Córdoba. Secretaría de Ciencia y Tecnología. Instituto Superior de Investigación, Desarrollo y Servicio de Alimentos; ArgentinaFil: Leon, Alberto Edel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Ciencia y Tecnología de Alimentos Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Ciencia y Tecnología de Alimentos Córdoba; ArgentinaFil: Ferreira, V. A.. Universidad Nacional de La Pampa. Facultad de Agronomía; ArgentinaFil: Grassi, E. M.. Universidad Nacional de La Pampa. Facultad de Agronomía; ArgentinaFil: Di Santo, Hernán Elías. Universidad Nacional de La Pampa. Facultad de Agronomía; ArgentinaFil: Castillo, E. A.. Universidad Nacional de La Pampa. Facultad de Agronomía; ArgentinaFil: Paccapelo, Hector Antonio. Universidad Nacional de La Pampa. Facultad de Agronomía; Argentin

1873-1874, End of a Century?: Time and Space in Valera's Pepita Jiménez, Ros de Olano's Jornadas de retorno, and Alarcón's El sombrero de tres picos and La Alpujarra

This article argues for the existence of a literature of the first Spanish Republic in the early 1870s. Valera's Pepita Jimenez makes sense in relation to this literature, rather than in comparison with 'Realism'. The literature of the first republic is distinguished by two facets: an ongoing dialogue with Ros de Olano's experiments in simultaneous compression and extension of form; and a belief that the nineteenth-century revolutionary spirit of the age has reached a critical end point, and needs reinvention that leads to Restoration politics

Kaon Production and Kaon to Pion Ratio in Au+Au Collisions at \snn=130 GeV

Mid-rapidity transverse mass spectra and multiplicity densities of charged and neutral kaons are reported for Au+Au collisions at \snn=130 GeV at RHIC. The spectra are exponential in transverse mass, with an inverse slope of about 280 MeV in central collisions. The multiplicity densities for these particles scale with the negative hadron pseudo-rapidity density. The charged kaon to pion ratios are $K^+/\pi^- = 0.161 \pm 0.002 {\rm (stat)} \pm 0.024 {\rm (syst)}$ and $K^-/\pi^- = 0.146 \pm 0.002 {\rm (stat)} \pm 0.022 {\rm (syst)}$ for the most central collisions. The $K^+/\pi^-$ ratio is lower than the same ratio observed at the SPS while the $K^-/\pi^-$ is higher than the SPS result. Both ratios are enhanced by about 50% relative to p+p and $\bar{\rm p}$+p collision data at similar energies.Comment: 6 pages, 3 figures, 1 tabl

Demonstration of the temporal matter-wave Talbot effect for trapped matter waves

We demonstrate the temporal Talbot effect for trapped matter waves using ultracold atoms in an optical lattice. We investigate the phase evolution of an array of essentially non-interacting matter waves and observe matter-wave collapse and revival in the form of a Talbot interference pattern. By using long expansion times, we image momentum space with sub-recoil resolution, allowing us to observe fractional Talbot fringes up to 10th order.Comment: 17 pages, 7 figure

Azimuthal anisotropy and correlations in p+p, d+Au and Au+Au collisions at 200 GeV

We present the first measurement of directed flow ($v_1$) at RHIC. $v_1$ is found to be consistent with zero at pseudorapidities $\eta$ from -1.2 to 1.2, then rises to the level of a couple of percent over the range $2.4 < |\eta| < 4$. The latter observation is similar to data from NA49 if the SPS rapidities are shifted by the difference in beam rapidity between RHIC and SPS. Back-to-back jets emitted out-of-plane are found to be suppressed more if compared to those emitted in-plane, which is consistent with {\it jet quenching}. Using the scalar product method, we systematically compared azimuthal correlations from p+p, d+Au and Au+Au collisions. Flow and non-flow from these three different collision systems are discussed.Comment: Quark Matter 2004 proceeding, 4 pages, 3 figure

Azimuthal anisotropy: the higher harmonics

We report the first observations of the fourth harmonic (v_4) in the azimuthal distribution of particles at RHIC. The measurement was done taking advantage of the large elliptic flow generated at RHIC. The integrated v_4 is about a factor of 10 smaller than v_2. For the sixth (v_6) and eighth (v_8) harmonics upper limits on the magnitudes are reported.Comment: 4 pages, 6 figures, contribution to the Quark Matter 2004 proceeding