Encontrados 13 documentos, a visualizar página 1 de 2

System administration: installations and automation

InforAbERTA 2014 - IV Jornadas de Informática ; Presentation given at the event "IV Jornadas de Informática da Universidade Aberta".

Tensorial perturbations and stability of spherically symmetric d-dimensional bl...

We compute the tensorial perturbations to a general spherically symmetric metric in d dimensions with string–theoretical corrections quadratic in the Riemann tensor, from which we derive their respective potential. We use this result to study the stability of corresponding black hole solutions under such perturbations.

Scattering of spherically symmetric d-dimensional α′−corrected black holes in s...

We study scattering of minimally coupled massless scalar fields by non-extremal spherically symmetric black holes in d dimensions with string-theoretical α′ corrections. We then obtain a formula for the low frequency absorption cross section for every black hole of this kind, which we apply to known black hole solutions. We compare the α′ corrections for the absorption cross section with those for the black hol...

A interdisciplinaridade das tecnologias da saúde no diagnóstico e no tratamento...

Introdução – O cancro de mama é a principal causa de morte por cancro na população feminina portuguesa. Assim, pretende-se descrever sucintamente o percurso de uma paciente com tumor de mama, evidenciando a interligação entre algumas áreas das tecnologias da saúde. Metodologia – Selecionou-se um caso clínico de uma paciente com cancro de mama e recorreu-se à pesquisa bibliográfica de forma a apoiar ou refutar o...

Perturbations and scattering of spherically symmetric d-dimensional alpha'-corr...

We compute the tensorial gravitational perturbations of general spherically symmetric black holes in d dimensions with string{theoretical alpha' corrections. We then study the scattering of minimally coupled massless scalar fields by such black holes. We obtain a general formula for the low frequency absorption cross section for every black hole of this kind, which we apply to known black hole solutions. In eac...

String-corrected dilatonic black holes in dimensions

We solve the dilaton field equation in the background of a spherically symmetric black hole in bosonic or heterotic string theory with curvature-squared corrections in arbitrary d spacetime dimensions.We then apply this result to obtain a spherically symmetric black hole solution with dilatonic charge and curvature squared corrections in bosonic or heterotic string theory compactified on a torus. For this black...

Dilatonic black holes in heterotic string theory

We obtain the dilaton solution in the background of a spherically symmetric black hole with curvature-squared corrections in arbitrary d spacetime dimensions and a spherically symmetric black hole solution with dilatonic charge and curvature-squared corrections in heterotic string theory compacti ed on a torus. For this black hole we obtain its entropy, temperature, speci c heat and mass.

R^4 terms and d = 4 supergravity

Higher-order string effective actions and d=4 off-shell supergravity

We start by a concise yet thorough revision of four-dimensional superspace supergravity. We present curved superspace geometry, for arbitrary N, including torsion, curvature and Bianchi identities. We motivate the choice of torsion constraints. We then consider the particular cases of N = 1, 2. In both cases we show how Poincar´e supergravity can be obtained from conformal supergravity. We see how to obtain the...

Das equações de Maxwell aos monopolos magnéticos