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Sólitons de Ricci Gradiente Steady Localmente Conformemente Flat / On Locally Conformally Flat Gradient Steady Ricci SolitonsReis, Hiuri Fellipe Santos dos 22 March 2013 (has links)
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Previous issue date: 2013-03-22 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / In this work we present a study on locally conformally flat gradient steady Ricci solitons
which is based on a Huai Dong-Cao and Qing Chen’s article, where they was classified
the n-dimensional (n ≥ 3) complete noncompact locally conformally flat gradient steady
Ricci solitons. In particular, we prove that a complete noncompact non-flat locally
conformally flat gradient steady Ricci soliton is, up to scaling, the Bryant soliton. / Neste trabalho apresentamos um estudo dos sólitons de Ricci gradiente steady localmente
conformemente flat, baseado no trabalho de Huai-Dong Cao e Qiang Chen, onde são
classificados os sólitons de Ricci gradiente steady n-dimensionais (n ≥ 3), completos,
não-compactos e localmente conformemente flat. Em particular provamos que um sóliton
de Ricci gradiente steady completo, não-compacto, não-flat e localmente conformemente
flat é, a menos de homotetia, o sóliton de Bryant.
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Sobre rigidez de gradiente quase Ricci Soliton / About rigidity of gradient almost Ricci SolitonGomes, Maria Francisca de Sousa 20 April 2017 (has links)
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Previous issue date: 2017-04-20 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / This work is based on [1] and aims to show a result of rigidity for gradient almost
Ricci soliton. We will prove that an almost Ricci soliton gradient with nonnegative scalar
curvature, where ∇ f is a non-trivial conformal field, is either a Euclidean space R
n or
the sphere S
n
. Moreover, we have that, in the Spherical case, the potential function is
given by first eigenfunction of the Laplacian. Finally, we will find necessary and sufficient
conditions for that a compact locally conformally flat gradient almost Ricci soliton is
isometric the sphere Sn. / Este trabalho está baseado em [1] e tem por objetivo apresentar um resultado de
rigidez para gradiente quase Ricci soliton. Provaremos que um gradiente quase Ricci
soliton com curvatura escalar não-negativa, em que ∇ f é um campo conforme não-trivial,
é ou o espaço Euclidiano R
n ou a Esfera S
n
. Além disso, temos que no caso Esférico, a
função potencial é dada pela primeira auto função do Laplaciano. Por fim, encontraremos
condições necessárias e suficientes para que um gradiente quase Ricci soliton compacto
localmente conformemente flat seja isométrico a esfera Sn.
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Produtos torcidos e variedades conformemente planas / Warped products and conformally flat manifolds.Bonfim, Paula Gonçalves Correia 25 February 2015 (has links)
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Previous issue date: 2015-02-25 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / In this work, we propose to present concepts and results that guide us to construction
of examples of complete locally conformally flat manifolds of nonpositive curvature
obtained by Brozos-Vázquez, García-Río e Vázquez-Lorenzo in [4]. For this, was made
a study of product manifolds equipped with a multiply warped metric. / Neste trabalho nos propomos a apresentar conceitos e resultados que nos guiem para a
construção de exemplos de variedades completas localmente conformemente planas de
curvatura seccional não positiva, obtidos por Brozos-Vázquez, García-Río e Vázquez-
Lorenzo em [4]. Para isso, foi feito um estudo sobre variedades produto equipadas com
uma métrica torcida múltipla.
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