The thesis mainly studies two problems in Algebraic Geometry and Hodge Theory. The first problem deals with the geometric realizations of certain Hermitian symmetric domains as moduli space of algebraic varieties, notably the Abelian varieties and Calabi-Yau varieties. The study of the first problem occupies most of the thesis. In section 1.3; we study the second problem, namely, the L2 Higgs cohomology of polarized variation of Hodge structures over Hermitian symmetric domains. / Sheng Mao. / "December 2005." / Advisers: Shing-Tung Yau; Nai-Chung Conan Leung. / Source: Dissertation Abstracts International, Volume: 67-11, Section: B, page: 6442. / Thesis (Ph.D.)--Chinese University of Hong Kong, 2005. / Includes bibliographical references (p. 108-113). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [200-] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstracts in English and Chinese. / School code: 1307.

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Thesis (Ph.D.)--University of Melbourne, Dept. of Mathematics and Statistics, 2007. / Typescript. Includes bibliographical references.

Thesis (Ph. D.)--University of Chicago, Department of Mathematics, June 2000. / Includes bibliographical references. Also available on the Internet.

Thesis (doctoral)--Bonn, 1997. / Includes bibliographical references (p. 93-95).

Thesis (doctoral)--Bonn, 1997. / Vita. Includes bibliographical references (p. 167-168).

Thesis (Ph. D.)--University of Washington, 2006. / Vita. Includes bibliographical references (p. 54-56).

Thesis (Ph. D.)--Universiteit van Amsterdam, 1983. / Includes bibliographical references.

Orientador: Alcibiades Rigas, Tomas Edson Barros / Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Matematica, Estatistica e Computação Cientifica / Made available in DSpace on 2018-08-06T01:35:44Z (GMT). No. of bitstreams: 1 Hoefel_EduardoOuteiralCorrea_D.pdf: 1956293 bytes, checksum: 425e3f8509c6c6d5b7e71d692027dfaf (MD5) Previous issue date: 2006 / Resumo: Esta tese consiste do estudo das OCHAs (Open-Closed Homotopy Algebras) sob os pontos de vista algébrico e geométrico. São demonstrados essencialmente dois resultados novos. O primeiro refere-se à definição de OCHA através de coderivações. Mais especificamente, provamos que qualquer coderivação D E Coderl (sc'Hc 0 TC'Ho) de grau 1 satisfazendo D2 = O define uma estrutura de OCHA em 'H = 'Hcffi'Ho. Onde 'Hc e 'Ho são os espaços de estados da teoria de campo de corda para cordas fechadas ("dosed strings") e cordas abertas ("open strings"), respectivamente. Até então, sabia-se que as OCHAs eram dadas por coderivações [14], mas o fato de que qualquer coderivação define uma OCHA, é novo. O segundo resultado envolve a relação entre OCHA e a versão real da compactificação de Fulton MacPherson do espaço de configurações de pontos no semi-plano superior fechado. Este resultado mostra a estreita relação entre OCHAs e a operada do "Queijo Suíço" introduzida por Voronov [41], tal relação foi de fato sugeri da na introdução de [14]. O capítulo 1 contém uma discussão sobre a definição de OCHA usando coálgebras e a conseqüente caracterização das coderivações mencionada acima. Mostramos também que a estrutura de OCHA pode ser obtida a partir de certas álgebras A(X) de forma inteiramente análoga ao modo como álgebras de Lie podem ser obtidas a partir de álgebras associativas. Em seguida, o capítulo 2 traz a abordagem das OCHAs através de operadas. O capítulo 3 traz uma discussão detalhada do espaço C(p, q) (a compactificação de Fulton;.MacPherson do espaço de configurações de p + q pontos no semi-plano superior fechado com p pontos no interior e q pontos no bordo) e no capítulo 4 mostramos que a parte essencial da operada que descreve as OCHAs aparece na primeira linha do termo E1 da seqüência espectral induzida por aquele espaço. O resultado mencionado acima significa que a estrutura algébrica das OCHAs está codificada na estratificação do bordo da variedade C(p, q), visto que esta última tem uma estrutura de variedade com córneres. No capítulo final discutimos o significado dos dois resultados obtidos procurando fazer um paralelo entre as abordagens geométrica e algébrica e mencionamos alguns problemas interessantes, como continuação deste trabalho, que podem ser considerados por estudantes interessados em Álgebras Homotópicas e temas relacionados / Abstract: This thesis consists of the study of OCHA (Open-Closed Homotopy Algebras) from both the algebraic and geometric viewpoint. It essentially contains the proof of two new results. The first one is related to the definition of OCHA through coderivations. More specifically, it is shown that any degree one coderivation D E Caderl(Sc7íc 0 TC7ío) such that D2 = O defines an OCHA structure on 7í = 7íc E9 7ío. Where 7íc and 7ío are respectively the state spaces of Closed String Field Theory and apen String Field Theory. It was cIear since its definition in 2004 that OCHAs can be defined in terms of coderivations. Nevertheless, the fact that any such coderivation is of the OCHA form is new. The second result involves the relation between OCHA and the real version of the Fulton MacPherson compactification of the configuration space of points on the cIosed upper half-plane. That result shows the cIose relation between OCHAs and the Swiss-Cheese operad introduced by Voronov [411. Such relation was in fact suggested in the introductian of [141. Chapter 1 contains a discussion about the coalgebraic definition of OCHA and the above mentioned characterization of alI coderivations. It is also shown that OCHA can be obtained from certain A8 algebras, similarly to way in which Lie algebras are obtained fro_ associative algebras. Chapter 2 then shows how to approach OCHA using aperads. The space C(p, q) (the FuIton-MacPherson compactification of the configuration space of p + q points on the upper half-plane with p interior points and q boundary points) is discussed on chapter 3 and on chapter 4 it is shown that the essential part of the operad describing OCHA appears on the first line Of the spectral sequence induced by that space. In other words, we could say that the algebraic structure of OCHA is encoded in the stratification of C(p, q), since this space has the structure of a manifold with corners. The final chapter is a discussion about the meaning of the two mais results of this thesis. After that, some problems which could be explored by the student interested on homotopy algebras and related subjects are mentioned. / Doutorado / Geometria Topologia / Doutor em Matemática

Diese Dissertation hat zwei Teile. Im ersten Teil untersuchen wir die Modulräume von Kurven mit multiplen Spinstrukturen. Wir stellen eine neue Kompaktifizierung dieser Räume mit geometrisch sinnvollem Grenzverhalten vor. Die irreduziblen Komponenten dieser Räume werden vollstandig klassifiziert. Die Ergebnisse aus diesem ersten Teil der Dissertation sind fundamental für die Degenerationstechniken im zweiten Teil. Im zweiten Teil untersuchen wir eine Reihe von Problemen, die von der klassischen Geometrie inspiriert werden. Unser Hauptaugenmerk liegt hierbei auf dem Fall von zwei Hyperebenen, die eine kanonische Kurve in jedem Schnittpunkt tangential berühren. Wir fragen, ob eingemensamer Tangentialpunk existieren kann. Unsere Analyse zeigt, dass so ein gemeinsamer Punkt nur in Kodimension 1 im Modulraum existieren kann. Wir berechen dann weiter die Klasse dieses Divisors. Insbesonders zeigen wir, dass diese Klasse eine hinreichend kleine Steigung hat, sodass die kanonischen Klassen von Modulräumen von Kurven mit zwei ungeraden Spinstrukturen gross ist, wenn der Genus grösser ist als neun. Falls die zugehörigen groben Modulräume gutartige Singularitäten haben, dann haben sie in diesem Intervall maximale Kodaria Dimension. / This thesis has two parts. In Part I we consider the moduli spaces of curves with multiple spin structures and provide a compactification using geometrically meaningful limiting objects. We later give a complete classification of the irreducible components of these spaces. The moduli spaces built in this part provide the basis for the degeneration techniques required in the second part. In the second part we consider a series of problems inspired by projective geometry. Given two hyperplanes tangential to a canonical curve at every point of intersection, we ask if there can be a common point of tangency. We show that such a common point can appear only in codimension 1 in moduli and proceed to compute the class of this divisor. We then study the general properties of curves in this divisor. Our divisor class has small enough slope to imply that the canonical class of the moduli space of curves with two odd spin structures is big when the genus is greater than 9. If the corresponding coarse moduli spaces have mild enough singularities, then they have maximal Kodaira dimension in this range.