Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"Orbifolds"”.
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Multiplicity formulas for orbifolds
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 1996.
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Four Dimensional Toric Orbifolds and Holography
L'abstract è presente nell'allegato / the abstract is in the attachment
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5D Supersymmetric Orbifolds: Supergravity/Phenomenological Aspects
Five-dimensional braneworlds attracted much attention in recent years, be it for phenomenological, cosmological or theoretical reasons. In this work we study supersymmetric theories compactified on the orbifold S1/Z2. We start with a short discussion of power-law unification, where 5D rigid super …
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A Structure Theorem for Bad 3-Orbifolds
<p>We explicitly construct 10 families of bad 3-orbifolds, X , having the following property: given any bad 3-orbifold, O, it admits an embedded suborbifold X ∈ X such that after removing this member from O, and capping the resulting boundary, and then iterating this process finitely many times, …
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Atiya-Bott theory for orbifolds and Dedkind sums
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mathematics, 1994.
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Aspects of branes and orbifolds in string theory
The main theme of this thesis is branes and orbifolds in string theory, with some digression towards other directions in the final chapters. After reviewing background material on D-branes and orbifolds, along with some mathematical fundamentals, I describe the following results. First, a …
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Braid groups and mapping class groups for 2-orbifolds
The main achievement of this thesis is that pure orbifold braid groups fit into an exact sequence 1$\\rightarrow$ …
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Local enumerative invariants of some Gorenstein surfaces and orbifolds
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms
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Ricci-flat deformations of orbifolds and asymptotically locally Euclidean manifolds
… of Ricci-flat Kähler metrics on compact orbifolds and asymptotically locally Euclidean(ALE) manifolds. In both cases we also study the moduli space of Ricci-flat structures. For this purpose, it is convenient to assume that the initial Ricci-flat metrics are Kähler. Our work extends …
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Compact G<sub>2</sub>-orbifolds via Twisted Connected Sums and Associative 3-folds
… Connected Sum}, to the setting of $7$-orbifolds, spaces locally modeled on $\mathbb{R}^7/\Gamma$, quotients of $\mathbb{R}^7$ by finite subgroups $\Gamma$ of the group $G_2$. Our work extends previous results by Alexei Kovalev (\cite{Kov1}) and Dominic Joyce (\cite{Joy1}) on the …
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On Berglund-Hübsch-Krawitz Mirror Symmetry
… various suites of results for the Calabi-Yau orbifolds that have Berglund-Hübsch-Krawitz (BHK) mirrors. These Calabi-Yau orbifolds are certain finite symplectic quotients of hypersurfaces in weighted-projective space. First, we will describe their birational geometry using Shioda maps and …
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On the (Co)Homology of Non-Commutative Toroidal Orbifold
… In this thesis, we study noncommutative toroidal orbifolds generated by actions of finite subgroups of <em>S L</em>(2,) on a noncommutative torus algebra.</p> <p>In the first part, we calculate the Hochschild and cyclic homology of Γ for all finite subgroups Γ <em>S</em> L(2,). In the second part …
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Black holes with a twist
In this thesis we study string theory on orbifolds of AdS3. Non-extremal BTZ black holes have been shown to oer a good opportunity to study closed string tachyon condensation, as there are tachyons in the winding sector even in superstring theory. We study extremal BTZ black holes, both M = 0 and M …
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Flux compactifications of Type II string theories under non-perturbative dualities
… Type II string theories on toroidal orbifolds and generalised Calabi-Yau manifolds and their transformations under a set of non-perturbative dualities. The dualities are the Type IIA-IIB exchanging T duality, the self-symmetry of Type IIB S duality, the non-trivial combination of the …
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On algebraic singularities, finite graphs and D-brane gauge theories : a string theoretic perspective -- with a digression on string field theory
… background in both the mathematics, such as orbifolds, symplectic quotients and quiver representations, as well as the physics, such as gauged linear sigma models, geometrical engineering, Hanany-Witten setups and D-brane probes. We present the work of the author in the past 4 years at the …
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Counting coloured boxes
… for the Donaldson-Thomas theory of local orbifolds satisfying the Hard Lefschetz condition.
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Hitchin Functionals, h-Principles and Spectral Invariants
… result for singular fibrations between orbifolds, without assumptions on curvature, which is proved in Chapter 4. Chapter 5 broadens the focus of Part I to include the Hitchin functionals $\mathcal{H}_4$, $\widetilde{\mathcal{H}}_3$ and $\widetilde{\mathcal{H}}_4$ on closed …
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Bubble tree compactification of instanton moduli spaces
… closed oriented Riemannian 4-manifolds and 4-orbifolds. In general the ASD moduli space is not compact since the curvature of a sequence of connections may blow up at some points in the manifold. There is a widely-used version of compactification called Uhlenbeck compactification. The idea is …
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Bubble tree compactification of instanton moduli spaces
… closed oriented Riemannian 4-manifolds and 4-orbifolds. In general the ASD moduli space is not compact since the curvature of a sequence of connections may blow up at some points in the manifold. There is a widely-used version of compactification called Uhlenbeck compactification. The idea is …
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