Entanglement Entropy of the Low-Lying Excited States and Critical Properties of an Exactly Solvable Two-Leg Spin Ladder with Three-Spin Interactions

In this work, we investigate an exactly solvable two-leg spin ladder with three-spin interactions. We obtain analytically the finite-size corrections of the low-lying energies and determine the central charge as well as the scaling dimensions. The model considered in this work has the same universality class of critical behavior of the XX chain with central charge c=1. By using the correlation matrix method, we also study the finite-size corrections of the Renyi entropy of the ground state and of the excited states. Our results are in agreement with the predictions of the conformal field theory.Comment: 10 pages, 6 figures, 2 table

"No-Scalar-Hair" Theorems for Nonminimally Coupled Fields with Quartic Self-Interaction

Self-gravitating scalar fields with nonminimal coupling to gravity and having a quartic self-interaction are considered in the domain of outer communications of a static black hole. It is shown that there is no value of the nonminimal coupling parameter $\zeta$ for which nontrivial static black hole solutions exist. This result establishes the correctness of Bekenstein ``no-scalar-hair'' conjecture for quartic self-interactions.Comment: 8 pages, RevTeX

Manejo reprodutivo de matrizes e reprodutores caprinos em sistema de produção de leite.

O presente documento destaca os aspectos relevantes e apresenta recomendações no âmbito do Sistema de Produção de Leite, destacando desde as condições adequadas para a implantação do manejo reprodutivo, eficiência reprodutiva, seleção de eprodutores e matrizes, até o manejo das crias.bitstream/CNPC/20259/1/doc65.pd

A systematic numerical study of the tidal instability in a rotating triaxial ellipsoid

The full non-linear evolution of the tidal instability is studied numerically in an ellipsoidal fluid domain relevant for planetary cores applications. Our numerical model, based on a finite element method, is first validated by reproducing some known analytical results. This model is then used to address open questions that were up to now inaccessible using theoretical and experimental approaches. Growth rates and mode selection of the instability are systematically studied as a function of the aspect ratio of the ellipsoid and as a function of the inclination of the rotation axis compared to the deformation plane. We also quantify the saturation amplitude of the flow driven by the instability and calculate the viscous dissipation that it causes. This tidal dissipation can be of major importance for some geophysical situations and we thus derive general scaling laws which are applied to typical planetary cores

Stress response function of a two-dimensional ordered packing of frictional beads

We study the stress profile of an ordered two-dimensional packing of beads in response to the application of a vertical overload localized at its top surface. Disorder is introduced through the Coulombic friction between the grains which gives some indeterminacy and allows the choice of one constrained random number per grain in the calculation of the contact forces. The so-called `multi-agent' technique we use, lets us deal with systems as large as $1000\times1000$ grains. We show that the average response profile has a double peaked structure. At large depth $z$, the position of these peaks grows with $cz$, while their widths scales like $\sqrt{Dz}$. $c$ and $D$ are analogous to `propagation' and `diffusion' coefficients. Their values depend on that of the friction coefficient $\mu$. At small $\mu$, we get $c_0-c \propto \mu$ and $D \propto \mu^\beta$, with $\beta \sim 2.5$, which means that the peaks get closer and wider as the disorder gets larger. This behavior is qualitatively what was predicted in a model where a stochastic relation between the stress components is assumed.Comment: 7 pages, 7 figures, accepted version to Europhys. Let

Proteínas do plasma seminal de ovinos da raça Morada Nova presentes no período de transição chuvoso-seco na região Norte do Estado do Ceará.

A identificação das proteínas é uma das principais alternativas para compreendermos as interações do plasma seminal com os espermatozóides. Em relação à espécie ovina e, mais precisamente a raça Morada Nova poucos trabalhos são encontrados na literatura relacionados a esses animais. Foram utilizados quatro animais em idade reprodutiva onde foi coletado o sêmen semanalmente, no período de transição chuvoso-seco, na região Norte do Estado do Ceará, referentes aos meses de julho e agosto/2009. Observou-se a presença de 20 e 19 bandas protéicas nos meses de julho e agosto/2009, com pesos moleculares variando de 22 a 115kDa e 20 a 98kDa, respectivamente. Foram identificadas as proteínas de peso 97, 79, 66, 55, 42, 29 e 22 kDa em todo o período estudado. Objetivou-se avaliar a variação protéica do plasma seminal presentes no período de transição chuvoso-seco em ovinos da raça Morada Nova. Abstract: The protein identification is an alternative in order to understand the seminal plasma and spermatozoid interaction. Concerning to ovine specie and specially the Morada Nova breed, are rare the works found in literature related to these animals. It were utilized four adults animals at reproductive aging where it was collected semen weekly during the transition rainy/dry period related to months of Juky and August, in the North region of Ceará State. It was observed the presence of 20 and 19 proteins bands on July and August with molecular weight varying from 22 to 115 and from 20 to 98 kDa, respectively. It were identified proteins with molecular weight of 97, 79, 66, 55, 42, 29 and 22 kDa along the period studied. Aimed to evaluate the variation of seminal plasma protein present in the transition period wetdry sheep Morada Nova

Analytic Lifshitz black holes in higher dimensions

We generalize the four-dimensional R^2-corrected z=3/2 Lifshitz black hole to a two-parameter family of black hole solutions for any dynamical exponent z and for any dimension D. For a particular relation between the parameters, we find the first example of an extremal Lifshitz black hole. An asymptotically Lifshitz black hole with a logarithmic decay is also exhibited for a specific critical exponent depending on the dimension. We extend this analysis to the more general quadratic curvature corrections for which we present three new families of higher-dimensional D>=5 analytic Lifshitz black holes for generic z. One of these higher-dimensional families contains as critical limits the z=3 three-dimensional Lifshitz black hole and a new z=6 four-dimensional black hole. The variety of analytic solutions presented here encourages to explore these gravity models within the context of non-relativistic holographic correspondence.Comment: 14 page