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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Sólitons de Ricci Gradiente Steady Localmente Conformemente Flat / On Locally Conformally Flat Gradient Steady Ricci Solitons

Reis, Hiuri Fellipe Santos dos 22 March 2013 (has links)
Submitted by Jaqueline Silva (jtas29@gmail.com) on 2014-10-23T20:04:48Z No. of bitstreams: 2 Dissertação - Hiuri Fellipe Santos dos Reis - 2013.pdf: 1601406 bytes, checksum: f2663891a9c0968329f2f913ada41d9e (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Approved for entry into archive by Jaqueline Silva (jtas29@gmail.com) on 2014-10-23T20:05:03Z (GMT) No. of bitstreams: 2 Dissertação - Hiuri Fellipe Santos dos Reis - 2013.pdf: 1601406 bytes, checksum: f2663891a9c0968329f2f913ada41d9e (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Made available in DSpace on 2014-10-23T20:05:03Z (GMT). No. of bitstreams: 2 Dissertação - Hiuri Fellipe Santos dos Reis - 2013.pdf: 1601406 bytes, checksum: f2663891a9c0968329f2f913ada41d9e (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) 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.
2

Sobre rigidez de gradiente quase Ricci Soliton / About rigidity of gradient almost Ricci Soliton

Gomes, Maria Francisca de Sousa 20 April 2017 (has links)
Submitted by JÚLIO HEBER SILVA (julioheber@yahoo.com.br) on 2017-05-04T20:17:22Z No. of bitstreams: 2 Dissertação - Maria Francisca de Sousa Gomes - 2017.pdf: 1138083 bytes, checksum: ec11ffa7d803dc5e840f5b216f1aaba3 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2017-05-05T13:03:10Z (GMT) No. of bitstreams: 2 Dissertação - Maria Francisca de Sousa Gomes - 2017.pdf: 1138083 bytes, checksum: ec11ffa7d803dc5e840f5b216f1aaba3 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Made available in DSpace on 2017-05-05T13:03:10Z (GMT). No. of bitstreams: 2 Dissertação - Maria Francisca de Sousa Gomes - 2017.pdf: 1138083 bytes, checksum: ec11ffa7d803dc5e840f5b216f1aaba3 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) 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.
3

Métrica produto torcido e variedades de curvatura negativa / Warped product metric and manifolds of negative curvature

Santos, Aderval Alves dos 16 April 2015 (has links)
Submitted by Cláudia Bueno (claudiamoura18@gmail.com) on 2015-10-22T19:38:27Z No. of bitstreams: 2 Dissertação - Aderval Alves dos Santos - 2015.pdf: 1809483 bytes, checksum: 2d02135104ab475d9fa74b9e024f978b (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2015-10-23T11:06:33Z (GMT) No. of bitstreams: 2 Dissertação - Aderval Alves dos Santos - 2015.pdf: 1809483 bytes, checksum: 2d02135104ab475d9fa74b9e024f978b (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Made available in DSpace on 2015-10-23T11:06:33Z (GMT). No. of bitstreams: 2 Dissertação - Aderval Alves dos Santos - 2015.pdf: 1809483 bytes, checksum: 2d02135104ab475d9fa74b9e024f978b (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) Previous issue date: 2015-04-16 / Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq / This work, based on the articles M. Brozos Vazquez, E. Garcia-Rio and R. Vazquez- Lorenzo whose goal is to build examples of manifolds locally conformally flat full of negative curvature through warped product and multiply warped product structure. The warped product was first introduced by Bishop and O’Neill, who modified the structure of the Riemannian product in obtaining new manifolds of negative curvature. / Este trabalho, baseado no artigo de M. Brozos-Vázquez, E. Garcia-Río e R. Vázquez- Lorenzo, tem como objetivo construir exemplos de variedades localmente conformemente flat completas de curvatura negativa por meio de produto torcido e estrutura de produto torcido mútiplo. Os produtos torcidos foram introduzidos primeiramente por Bishop e O’Neill, que modificaram a estrutura do produto Riemanniano na obtenção de novas variedades de curvatura negativa.

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