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Previous issue date: 2001-11-07 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / The present work investigates some consequences that arise from the use of a modifed lagrangean for the eletromagnetic feld in two diferent contexts: a spatially homogeneous and isotropic universe whose dynamics is driven by a magnetic feld plus a cosmological parameter A, and the problem of a static and charged point mass (charged black hole). In the cosmological case, three diferent general solutions were derived. The first, with a null cosmological parameter A, generalizes a particular solution obtained by Novello et al [gr-qc/9806076]. The second one admits a constant A and the third one allows A to be a time-dependent parameter that sustains a constant magnetic feld. The first two solutions are non-singular and exhibit in ationary periods. The third case studied shows an in ationary dynamics except for a short period of time. As for the problem of a charged point mass, the solutions of the Einstein-Maxwell equations are obtained and compared with the standard Reissner-Nordstrom solution. Contrary to what happens in the cosmological case, the physical singularity is not removed / No presente trabalho s?o investigadas algumas conseq??ncias da utiliza??o de uma nova lagrangeana para a eletrodin?mica em dois contextos: um universo espacialmente homog?neo e isotr?pico com campo magn?tico mais um par?metro cosmol?gico A e o problema da massa puntual caregada e est?tica (buraco negro carregado). No caso cosmol?gico, foram obtidas tr?s solu??es gerais: a primeira delas, para A=0, generaliza uma solu??o particular obrida por Novello et al [gr-qc/9806076]; a segunda admite um par?metro cosmol?gico constante e n?o-nulo e a terceira corresponde a um campo magn?tico constante sustentado por um A dependente do tempo. As duas primeiras solu??es s?o n?o-singulares e possuem per?odos inflacion?rios. A terceira solu??o apresenta uma din?mica inflacion?ria exceto por um curto intervalo de tempo. No contexto do problema da massa puntual carregada, a solu??o das equa??es de Einstein-Maxwell ? obtida e comparada com a solu??o padr?o de Reissner-Nordstr?m. Ao contr?rio do caso cosmol?gico, a singularidade f?isica n?o ? removida
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/16626 |
| Date | 07 November 2001 |
| Creators | C?mara Neto, Calistrato Soares da |
| Contributors | CPF:10829750444, http://lattes.cnpq.br/4770731765905643, Carvalho Filho, Joel C?mara de, CPF:65038274820, http://lattes.cnpq.br/4585335971279853, Lima, Jos? Ademir Sales de, CPF:10659682415, http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4787078Z7, Maia, M?rcio Roberto Garcia |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em F?sica, UFRN, BR, F?sica da Mat?ria Condensada; Astrof?sica e Cosmologia; F?sica da Ionosfera |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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