Sobre certas teorias de cohomologia de grupos e aplicações

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Soluções tipo vórtex em teorias de gauge Chern-Simons-Maxwell-Higgs

Pós-graduação em Física - IFT

Cordas cósmicas e gravitação planar de ordem superior

The possibility of generalizing gravity in 2+1 dimensions to include higher-derivative terms, thereby allowing for a dynamical theory, opens up a variety of new interesting questions. This is in great contrast with pure Einstein gravity which is a generally covariant theory that has no degrees of freedom - a peculiarity that, in a sense, renders it a little insipid and odorless. The research on gravity of particles moving in a plane, that is, living in flatland, within the context of higher-derivative gravity, leads to novel and interesting effects. For instance, the generation of gravity, antigravity, and gravitational shielding by the interaction of massive scalar bosons via a graviton exchange. In addition, the gravitational deffection angle of a photon, unlike that of Einstein gravity, is dependent of the impact parameter. On the other hand, the great drawback to using linearized general relativity for describing a gravitating string is that this description leads to some unphysical results such as: (i) lack of a gravity force in the nonrelativistic limit; (ii) gravitational deffection independent of the impact parameter. Interesting enough, the effective cure for these pathologies is the replacement of linearized gravity by linearized higher-derivative gravity. We address these issues here

Compactificação alternativa de dimensões extras em gravitação de Brans-Dicke

After a brief introduction of some gravitational aspects of the Randall-Sundrum braneworld model as well as of the Brans-Dicke (BD) gravity, we propose two braneworld models using the, local and global, cosmic strings in the BD framework in order to generate all the bulk/brane structure. The final scenario is composed, in both cases, of a warped 4-brane with topology 'R POT. 4' x 'S POT. 1' and one extra dimension transverse to the brane. After that, we analyze the founded models in the scope of the Gauss-Codazzi formalism, with and without the imposition of 'Z IND. 2' symmetry on the brane

Teorias curriculares, perspectivas teóricas em educação física escolar e implicações para a formação docente

A função do professor de educação física escolar pode ser definida pela elaboração, implantação e avaliação de programas que tematizam, do ponto de vista didático-pedagógico, jogos, esportes, lutas, ginásticas, danças, exercícios físicos, entre outros; com a intenção de influenciar a formação dos alunos para a participação democrática na vida em sociedade. Todavia, este consenso se dilui quando aplicado ao campo do currículo e da formação docente. No campo do currículo, apesar do reconhecimento de que a tematização didático-pedagógica se faz a partir de sentidos culturais e das potencialidades de estimulação do organismo humano que se apresentam nas manifestações da cultura de movimento; a intencionalidade, a organização curricular e a sistematização do conhecimento podem divergir consideravelmente modificando o papel do componente curricular na educação básica. Sendo assim, este texto analisa aspectos do desenvolvimento das teorias curriculares, relacionando-as às perspectivas teóricas em Educação Física. Em seguida, implicações deste debate são relacionadas à formação docente.

Da informação nossa de cada dia à Ciência da Informação : Conceitos, história, teorias e questões recentes

The work has as objective to produce a look about what we can think as a long history of information, what we think out from the most remote times until its conversion to theástatusáof object of the Information Science (IS) in the second half of 20th century. Of theorical nature and keeping up itself by the literature in IS and in similar areas, a discussion is made about the concept of information to then to list names, happenings and theories that contributed in the passage of the domain of the daily life to the domain of the Science. From a distant past to the most recent happenings connected to the problem of the privacity of the citizens in the digital networks, it is verified in the history of information a closed relation with the power, reason that suggests the deepening of the studies in IS about the political and ethical issues in the contemporary society.