Lorentz-Violating Regulator Gauge Fields as the Origin of Dynamical Flavour Oscillations

We show how a mass mixing matrix can be generated dynamically, for two massless fermion flavours coupled to a Lorentz invariance violating (LIV) gauge field. The LIV features play the role of a regulator for the gap equations, and the non-analytic dependence of the dynamical masses, as functions of the gauge coupling, allows to consider the limit where the LIV gauge field eventually decouples from the fermions. Lorentz invariance is then recovered, to describe the oscillation between two free fermion flavours, and we check that the finite dynamical masses are the only effects of the original LIV theory. We also discuss briefly a connection of our results with the case of Majorana neutrinos in both, the standard model, where only left-handed (active) neutrinos are considered, and extensions thereof, with sterile right-handed neutrinos.Comment: 32 page

Quasi-relativistic fermions and dynamical flavour oscillations

We introduce new Lorentz-symmetry violating kinematics for a four-fermion interaction model, where dynamical mass generation is allowed, irrespectively of the strength of the coupling. In addition, these kinematics lead to a quasi-relativistic dispersion relation, in the sense that it is relativistic in both the infrared and the ultraviolet, but not in an intermediate regime, characterized by the mass $M$. For two fermions, we show that a flavour-mixing mass matrix is generated dynamically, and the Lorentz symmetric limit $M\to\infty$ leads to two free relativistic fermions, with flavour oscillations. This model, valid for either Dirac or Majorana fermions, can describe any set of phenomenological values for the eigen masses and the mixing angle.Comment: 18 pages, comments adde

Software Transparency

Software transparency is a new concern that software developers must deal with. As society moves towards the digitalization of day to day processes, the transparency of these digital processes becomes of fundamental importance if citizens would like to exercise their right to know. Informed discourse is only possible if processes that affect the public are open to evaluation. Achieving software transparency to this level of openness brings up several roadblocks. This talk reports on initial findings on exploring the obstacles for enabling software transparency

Understanding the word "analysis" in the context of requirements engineering

I have been teaching, in reality, preaching, the importance of a clear understanding for the word “analysis”. It is my conclusion, after years of exposure to the term “system analysis”, that it has mislead lots of young people how wishes to understand the process of software construction, in special the initial steps of the process. My main point is that you can only analyze something that you know. However, educators in the areas of information systems and software engineering always focused the “system analysis” as a modeling discipline, where specifications were written and formalization was sought at the very early stages of conceptions of a system. Based on this bias on modeling, analysis was a way of enforcing syntax rules of a given modeling language, which provide ways of applying verification protocols. As such, not enough emphasis was directed to the goal of really understanding the concepts involved and the needs of the clients. (Párrafo extraído del texto a modo de resumen)Facultad de Informátic

Dynamical scoto-seesaw mechanism with gauged B−LB-L

We propose a dynamical scoto-seesaw mechanism using a gauged $B-L$ symmetry. Dark matter is reconciled with neutrino mass generation, in such a way that the atmospheric scale arises \textit{a la seesaw}, while the solar scale is \textit{scotogenic}, arising radiatively from the exchange of ``dark'' states. This way we ``explain'' the solar-to-atmospheric scale ratio. The TeV-scale seesaw mediator and the two dark fermions carry different $B-L$ charges. Dark matter stability follows from the residual matter parity that survives $B-L$ breaking. Besides having collider tests, the model implies sizeable charged lepton flavour violating (cLFV) phenomena, including Goldstone boson emission processes.Comment: 20 pages, 6 figures, 2 table

A influência do credito rural no programa INOVAGRO - Inovação na Agropecuária

Com o objetivo de buscar analisar a influência do crédito rural em um programa de crédito agropecuário dirigido à inovação, mais especificamente em relação ao Inovagro, destinado a incentivar a inovação na agropecuária, foi realizado um apanhado da literatura disponível e da conceituação sobre o que é inovação e de dados sobre a agropecuária brasileira. O programa Inovagro, coordenado pelo BNDES e pelo Ministério da Agricultura, apesar de ser mais favorável financeiramente aos produtores, tem certas dificuldades e condicionantes para ser acessado, além de ser relativamente desconhecido pelos produtores por ter apenas cinco anos de efetiva implantação. Por isso foi efetuada uma pesquisa entre bancos e cooperativas concedentes desse crédito, bem como entre os tomadores para se conhecer a receptividade do referido programa. Constatou-se uma crescente participação dos produtores e entendimento do Inovagro no que tange às suas vantagens em disseminar boas práticas agropecuárias, fixação do conhecimento de técnicas de maior produtividade, menor custo, eficácia e efetividade, gerando maior rentabilidade e produção de melhor qualidade, embora os custos iniciais possam ser maiores. Foram apresentadas algumas recomendações para que o Inovagro seja cada vez mais utilizado pelo governo, preferencialmente ao crédito direcionado de outras linhas, bem como para que haja melhor divulgação junto aos interessados tomadores e concedentes.With the objective of analyzing the influence of rural credit in an agricultural credit program aimed at innovation, more specifically in relation to Inovagro, aimed at encouraging innovation in agriculture, a survey was made of available literature and the conceptualization of what is innovation and data on Brazilian agriculture. The Inovagro program, coordinated by the BNDES and the Ministry of Agriculture, despite being more financially favorable to producers, has certain difficulties and constraints to be accessed, in addition to being relatively unknown by producers for having only five years of effective implementation. Therefore, a survey was carried out between banks and cooperatives granting this credit, as well as among the borrowers to know the receptivity of said program. Increased participation of Inovagro producers and understanding of their advantages in disseminating good farming practices, establishing knowledge of higher productivity techniques, lower costs, effectiveness and effectiveness, generating higher profitability and better quality production was verified the initial costs may be higher. Some recommendations were made for Inovagro to be increasingly used by the government, preferentially to directed credit from other lines, as well as for better disclosure to the interested borrowers and grantors.47 p.InovaçãoPolíticas PúblicasEspecialização em Gestão de Políticas Públicas de Ciência, Tecnologia e Inovação - 1ª EdiçãoOrientador: Gilson Alceu Bittencour