The k-essence theory with a power-law function of (∂φ) 2 and Rastall's non-conservative theory of gravity with a scalar field are shown to have the same solutions for the metric under the assumption that both the metric and the scalar fields depend on a single coordinate. This equivalence (called k-R duality) holds for static configurations with various symmetries (spherical, plane, cylindrical, etc.) and all homogeneous cosmologies. In the presence of matter, Rastall's theory requires additional assumptions on how the stressenergy tensor non-conservation is distributed between different contributions. Two versions of such nonconservation are considered in the case of isotropic spatially flat cosmological models with a perfect fluid: one (R1) in which there is no coupling between the scalar field and the fluid, and another (R2) in which the fluid separately obeys the usual conservation law. In version R1 it is shown that k-R duality holds not only for the cosmological models themselves but also for their adiabatic perturbations. In version R2, among other results, a particular model is singled out that reproduces the same cosmological expansion history as the standard Λ CDM model but predicts different behaviors of small fluctuations in the k-essence and Rastall frameworks. 1

RODRIGUES, D. A. The new agenda for Brazilian public management: a case study of Detran-SP. 2015. 121f. Dissertação (

Resumo: Como em outras experiências anteriores de reforma do Estado, a implantação da Nova Administração Pública (NAP) no Brasil se deu de forma mais evidente em nível federal, sendo menos estudada no âmbito subnacional (estados e municípios). Ademais, em geral, a NAP costuma ser discutida por um ponto de vista macro, que considera a administração pública como um todo, sendo menos frequente seu estudo em nível organizacional. Assim, o objetivo deste artigo é analisar, por meio de um estudo de caso, a implantação de valores e práticas da NAP em uma organização estadual, historicamente associada às características e aos desvios da burocracia tradicional. A organização estudada é o Departamento Estadual de Trânsito de São Paulo (Detran-SP), que passou por um processo de restruturação e pode ser visto como um laboratório para entender as variáveis e desafios mais relevantes da NAP em nível subnacional, no Brasil. Palavras-chave:Nova Administração Pública, métodos e técnicas de gestão, modernização administrativa

We study the stability properties of static, spherically symmetric configurations in k-essence theories with the Lagrangians of the form F (X), X ≡ φ ,α φ ,α . The instability under spherically symmetric perturbations is proved for two recently obtained exact solutions for F (X) = F 0 X 1/3 and for F (X) = F 0 X 1/2 −2Λ , where F 0 and Λ are constants. The first solution describes a black hole in an asymptotically singular space-time, the second one contains two horizons of infinite area connected by a wormhole. It is argued that spherically symmetric k-essence configurations with n < 1/2 are generically unstable because the perturbation equation is not of hyperbolic type.

In this paper we investigate three theories characterised by non-vanishing divergence of the stress-energy tensor, namely f (R, LM ), f (R, T ), and Rastall theory. We show that it is not possible to obtain the third from the first two, unless in some very specific case. Nonetheless, we show that in the framework of cosmology in the f (R, T ) theory, a result similar to that found in the Rastall one is reproduced, namely that the dynamics of the ΛCDM model of standard cosmology can be exactly mimicked, even though the dark energy component is able to cluster.

We review some properties of black hole structures appearing in gravity with a massless scalar field, with both minimal and nonminimal coupling. The main properties of the resulting cold black holes are described. The study of black holes in scalar-gravity systems is extended to k-essence theories, and some examples are explicitly worked out. In these cases, even while the existence of horizons is possible, the metric regularity requirement on the horizon implies either a cold black type structure or a singular behavior of the scalar field. * kb20@yandex.ru †

RESUMOEste artigo tem como objetivo compreender o processo de implementação de reformas organizacionais no setor público, enfocando dois casos emblemáticos do governo do Estado de São Paulo: a estruturação do Poupatempo e a reforma do Detran.SP. Para tanto, baseando-se na literatura sobre implementação de políticas públicas, procura identificar as variáveis e determinantes que incidem sobre os processos de implementação de reformas organizacionais. Assim, foram analisados os objetivos, valores e princípios que as orientam, bem como elas são levadas a cabo a partir de diversas variáveis, como os atores, seu papel, perfil e atuação As categorias utilizadas para a análise permitiram identificar as variáveis que condicionam essas reformas, identificando questões comuns aos dois estudos e os elementos importantes para o seu sucesso. PALAVRAS-CHAVE:Reformas organizacionais, organizações públicas, implementação, gestão de organizações públicas, gerencialismo.

The study aimed to identify the level of data openness of the state traffic departments in Brazil (DETRANs). Two assessment instruments were used: Berners-Lee's (2010) Five Star Scheme and the 15 Open Data Principles proposed by Opengovdata (2007). Based on them, a methodology for structured analysis was built, and used to analyze three sets of data: related to the National Driver's License (CNH), to vehicles, and to traffic violations. Results indicate a low level of openness, lack of standardization, and the absence of specific regulations to stimulate or oblige the publication of traffic data in open formats.