Thermodynamics of static and stationary black holes in Einstein-Gauss-Bonnet gravity with dark matter

This paper studies Einstein-Gauss-Bonnet (EGB) black holes surrounded by three phenomenological distributions of dark matter halos. The main result is obtaining the analytical solutions for the metric and all thermodynamic quantities, such as Hawking temperature, entropy, constant-volume heat capacity, and Gibbs free energy for static and stationary black hole solutions. Consequently, we determine a non-null horizon radius at which the black hole halts its evaporation by vanishing the temperature, indicating the emergence of remnants. In the stationary case, we also obtain the ergosphere regions for the found solutions and compare them. Finally, we find local and global phase transitions by studying the behavior of the heat capacity and Gibbs free energy.Comment: We add the rotation black hole case. The new version has 22 pages and 11 figure

Horizon Fractalization in Black Strings Ungravity

In this paper we study the scalar(tensor) and vector unparticle corrections for cosmic and black strings. Initially we have considered an static cosmic string ansatz from which we obtain the solution in terms of first and second kind Bessel functions. We have also obtained the solution for black string in the unparticle scenario. We could identify two regimes, namely, a gravity dominated regime and an ungravity dominated regime. In the gravity dominated regime the black string solution recovers the usual solution for black strings. The Hawking temperature was also studied in both regimes and in the ungravity dominated regime. As in the static and rotating black hole, we found a fractalization of the event horizon. This points to the fact that fractalization is a natural consequence of unparticles. Finally, we study the thermodynamic of the black string in the ungravity scenario by computing the entropy, heat capacity and free energy. For both cases we find that, depending on the region of the parameter $d_U$, we can have phase transitions.Comment: 18 pages, 6 figure

Caracterização do sistema de produção de ovinos Santa Inês no Estado de Sergipe.

Com o presente trabalho objetivou-se caracterizar a produção ovina da raça Santa Inês no Estado de Sergipe, referência nacional pela qualidade genética. Através de 54 entrevistas semi-estruturadas e visitas às propriedades, obteve-se o perfil dos criadouros com relação ao manejo sanitário, nutricional e reprodutivo, bem como, finalidade e destino da criação. No geral, as propriedades apresentaram rebanhos de tamanho bastante variável, sendo o sistema semi-intensivo o mais utilizado. Em sua maioria, as criações tinham acompanhamento técnico regular e destinavam-se ao abate ou exploração genética. Criações com assistência veterinária associada a práticas adequadas de manejo mostraram maior produtividade. A carne ovina apresenta crescente demanda de mercado, porém a reduzida quantidade de abatedouros e frigoríficos no Estado parece contribuir como fator determinante para a escoação da produção para feiras livres sem fiscalização sanitária

Correlação entre produção e componentes do leite em gado de corte.

Este experimento teve como objetivo avaliar a produção e a composição do leite de vacas das raças Canchim e Nelore, tendo em vista o manejo da fase de cria de bovinos de corte

Relação do peso a desmama de bezerros da Raça Canchim e cruzados canchim x Nelore com constituintes do leite.

O trabalho teve como objetivo avaliar a importância das produções totais de proteÍnas, gordura e extrato seco total no leite, em 34 semanas de bezerros da raca Canchim e cruzados 1/2 Canchim + 1/2 Nelore.Resumo

A Transfer Matrix Method for Resonances in Randall-Sundrum Models

In this paper we discuss in detail a numerical method to study resonances in membranes generated by domain walls in Randall-Sundrum-like scenarios. It is based on similar works to understand the quantum mechanics of electrons subject to the potential barriers that exist in heterostructures in semiconductors. This method was used recently to study resonances of a three form field and lately generalized to arbitrary forms. We apply it to a lot of important models, namely those that contain the Gauge, Gravity and Spinor fields. In many cases we find a rich structure of resonances which depends on the parameters involved.Comment: 25 pages, 17 figure

Dual Spaces of Resonance In Thick p−p-Branes

In this work we consider $q-$form fields in a $p-$brane embedded in a $D=(p+2)$ space-time. The membrane is generated by a domain wall in a Randall-Sundrum-like scenario. We study conditions for localization of zero modes of these fields. The expression agrees and generalizes the one found for the zero, one, two and three-forms in a $3-$brane. By a generalization we mean that our expression is valid for any form in an arbitrary dimension with codimension one. We also point out that, even without the dilaton coupling, some form fields are localized in the membrane. The massive modes are considered and the resonances are calculated using a numerical method. We find that different spaces have identical resonance structures, which we call dual spaces of resonances(DSR).Comment: 15 page

Espessura de gordura externa e cortes do traseiro especial de machos não-castrados para produção do bovino jovem.

Foi realizado confinamento de 18 machos nao-castrados de cada um dos grupos geneticos Blonde d'Aquitaine X Nelore (BN), Canchim (CA), Piemontes X Nelore (PN) e Nelore (NE), abatidos aos 400 (I), 440 (II) e 480 kg (III) de peso vivo (TRAT); exceto para NE que foram abatidos aos 380, 410 e 440 kg. O peso do traseiro especial (TEE) foi influenciado (P0,05) pelo TRAT.Resumo expandid