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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

Elastic curves in hyperbolic space

Steinberg, Daniel Howard January 1995 (has links)
No description available.
2

On the Asymptotic Plateau Problem in Hyperbolic Space

Wang, Bin January 2022 (has links)
We are concerned with the so-called asymptotic Plateau problem in hyperbolic space. That is, to prove the existence of hypersurfaces in hyperbolic space whose principal curvatures satisfy a general curvature relation and has a precribed asymptotic boundary at infinity. In this thesis, by following the method of Bo Guan, Joel Spruck and their collaborators, we solve the problem with the aid of an additional assumption. In particular, our result applies to hypersurfaces whose principal curvatures lie in the k-th Garding cone and has constant (k,k-1) curvature quotient. / Thesis / Master of Science (MSc)
3

Hipersuperfícies regradas e de Weingarten no espaço hiperbólico / Ruled and Weingarten hypersurfaces in hyperbolic space.

Lymberopoulos, Alexandre 16 June 2009 (has links)
Neste trabalho apresentamos uma classificação das hipersuperfícies regradas e de Weingarten no espaço hiperbólico. / In this work we provide a classification for ruled and Weingarten hypersurfaces in hyperbolic space.
4

A proof of Seidel\'s conjectures on the volume of ideal tetrahedra in hyperbolic 3-space / Uma demonstração das conjecturas de Seidel sobre o volume de tetraedros ideais no 3-espaço hiperbólico

Cussy, Omar Chavez 27 June 2017 (has links)
We prove a couple of conjectures raised by J. J. Seidel in On the volume of a hyperbolic simplex, Stud. Sci. Math. Hung. (21, 243249, 1986). These conjectures concern the volume of ideal hyperbolic tetrahedra in hyperbolic 3-space and are related to the following general framework. Since explicit formulae for geometric quantities in hyperbolic space (distance, area, volume, etc.) typically involve sophisticated transcendental functions, it is desirable (and quite useful in practice) to expresses these geometric quantities as monotonic functions of algebraic maps. Seidels Speculation 1 says that the volume of an ideal tetrahedron in hyperbolic 3-space depends only on the determinant and permanent of the doubly stochastic Gram matrix of its vertices; Speculation 4 claims that the mentioned volume is monotone in both the determinant and permanent. We are able to give affirmative answers to Speculations 1 and 4 by parameterizing the classifying space of (labelled) ideal tetrahedra in a suitable way. / Provamos duas conjecturas apresentadas por J. J. Seidel em On the volume of a hyperbolic simplex, Stud. Sci. Math. Hung. (21, 243249, 1986). Estas conjecturas referem ao volume de tetraedros ideais no 3-espaço hiperbólico e estão relacionadas com o seguinte quadro geral. Como fórmulas explícitas para grandezas geométricas no espaço hiperbólico (distancia, área, volume, etc.) tipicamente envolvem funções transcendentais sofisticadas, é desejável (e, na prática, bastante útil) expressar tais grandezas geométricas como aplicações monótonas de mapas algébricos. A Especulação 1 de Seidel diz que o volume de um tetraedro ideal no 3-espaço hiperbólico depende apenas do determinante e do permanente da matriz de Gram duplamente estocástica G de seus vértices; a Especulação 4 afirma que o referido volume é monótono tanto no determinante quanto no permanente de G. Damos respostas afirmativas ás Especulações 1 e 4 ao parametrizar o espaço classificador de tetraedros ideais (marcados) de maneira adequada.
5

A proof of Seidel\'s conjectures on the volume of ideal tetrahedra in hyperbolic 3-space / Uma demonstração das conjecturas de Seidel sobre o volume de tetraedros ideais no 3-espaço hiperbólico

Omar Chavez Cussy 27 June 2017 (has links)
We prove a couple of conjectures raised by J. J. Seidel in On the volume of a hyperbolic simplex, Stud. Sci. Math. Hung. (21, 243249, 1986). These conjectures concern the volume of ideal hyperbolic tetrahedra in hyperbolic 3-space and are related to the following general framework. Since explicit formulae for geometric quantities in hyperbolic space (distance, area, volume, etc.) typically involve sophisticated transcendental functions, it is desirable (and quite useful in practice) to expresses these geometric quantities as monotonic functions of algebraic maps. Seidels Speculation 1 says that the volume of an ideal tetrahedron in hyperbolic 3-space depends only on the determinant and permanent of the doubly stochastic Gram matrix of its vertices; Speculation 4 claims that the mentioned volume is monotone in both the determinant and permanent. We are able to give affirmative answers to Speculations 1 and 4 by parameterizing the classifying space of (labelled) ideal tetrahedra in a suitable way. / Provamos duas conjecturas apresentadas por J. J. Seidel em On the volume of a hyperbolic simplex, Stud. Sci. Math. Hung. (21, 243249, 1986). Estas conjecturas referem ao volume de tetraedros ideais no 3-espaço hiperbólico e estão relacionadas com o seguinte quadro geral. Como fórmulas explícitas para grandezas geométricas no espaço hiperbólico (distancia, área, volume, etc.) tipicamente envolvem funções transcendentais sofisticadas, é desejável (e, na prática, bastante útil) expressar tais grandezas geométricas como aplicações monótonas de mapas algébricos. A Especulação 1 de Seidel diz que o volume de um tetraedro ideal no 3-espaço hiperbólico depende apenas do determinante e do permanente da matriz de Gram duplamente estocástica G de seus vértices; a Especulação 4 afirma que o referido volume é monótono tanto no determinante quanto no permanente de G. Damos respostas afirmativas ás Especulações 1 e 4 ao parametrizar o espaço classificador de tetraedros ideais (marcados) de maneira adequada.
6

The Ricci Flow of Asymptotically Hyperbolic Mass

Balehowsky, Tracey J Unknown Date
No description available.
7

Superfícies de curvatura média constante um no espaço hiperbólico / Surfaces of Constant mean curvature one in hyperbolic space

Santos, Márcio Silva 28 February 2011 (has links)
In this work the crucial point is to obtain a holomorphic representation for mean curvature one surfaces in hyperbolic space. This representation has a great resemblance to the Weierstrass representation for minimal surfaces in R3: From this, we obtain a range of results about the theory of mean curvature one surfaces complete and finite total curvature in H3. / Fundação de Amparo a Pesquisa do Estado de Alagoas / O ponto crucial do trabalho é a obtenção de uma representação holomorfa para superfícies de curvatura média um no espaço hiperbólico. Esta representação possui uma grande semelhança com a representação de Weierstrass para superfícies mínimas em R3: A partir disso, obteremos uma gama de resultados acerca da teoria de superfícies de curvatura média um, completas e de curvatura total finita em H3.
8

Sobre a geometria das horoesferas / On the geometry of horospheres

Francisco Yure Santos do Nascimento 23 July 2013 (has links)
Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico / Esse trabalho à baseado no artigo On the geometry of horospheres [4]. Nosso objetivo à estudar condiÃÃes geomÃtricas que garantam que uma hipersuperfÃcie completa e orientÃvel imersa no espaÃo hiperbÃlico deve ser uma horoesfera. AlÃm disso, apresentamos um resultado que classifica as hipersuperfÃcies imersas no espaÃo hiperbÃlico tais que certas funÃÃes auxiliares da imersÃo correspondente sejam linearmente dependentes. / This work is based on the paper On the geometry of horospheres[4]. Our goal is to study geometric conditions which ensure that a complete and orientable hypersurface immersed in a hyperbolic space must be a horosphere. We also present a result that classifies immersed hypersurfaces in hyperbolic space, such that two natural functions attached to the corresponding immersion are linearly dependent.
9

Hipersuperfícies regradas e de Weingarten no espaço hiperbólico / Ruled and Weingarten hypersurfaces in hyperbolic space.

Alexandre Lymberopoulos 16 June 2009 (has links)
Neste trabalho apresentamos uma classificação das hipersuperfícies regradas e de Weingarten no espaço hiperbólico. / In this work we provide a classification for ruled and Weingarten hypersurfaces in hyperbolic space.
10

Hyperbolic fillings of bounded metric spaces

Fagrell, Ludvig January 2023 (has links)
The aim of this thesis is to expand on parts of the work of Björn–Björn–Shanmugalingam [2] and in particular on the construction and properties of hyperbolic fillings of nonempty bounded metric spaces. In light of [2], we introduce two new parameters λ and ξ to the construction while relaxing a specific maximal-condition. With these modifications we obtain a slightly more flexible model that generates a larger family of hyperbolic fillings. We then show that every hyperbolic filling in this family possess the desired property of being Gromov hyperbolic. Next, we uniformize an arbitrary hyperbolic filling of this type and show that, under fairly weak conditions, the boundary of the uniformization is snowflake-equivalent to the completion of the metric space it corresponds to. Finally, we show that this unifomized hyperbolic filling is a uniform space. In summary, our construction generates hyperbolic fillings which satisfy the necessary conditions for it to serve its intended purpose of an analytical tool for further studies in [2, Chapters 9-13 ] or similar. As such, it can be regarded as an improvement to the reference model.

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