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 39 for “"Orbifold"”.
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Orbifold genera, product formulas and power operations
… Moore, Verlinde and Verlinde, expressing the orbifold elliptic genus of the symmetric powers of an almost complex manifold M in terms of the elliptic genus of M itself. We show that from the point of view of elliptic cohomology an analogous p-typical statement follows as an easy corollary from …
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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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Orbifold branes in string theory and their applications to cosmology.
This dissertation contains two distinct compactification schemes of 10-dimensional string theory, as well as some of the implications of one of these schemes for string cosmology. The first half of this work begins with a brief overview of cosmology and goes through constructing and then analyzing …
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Orbifold points on Teichmüller curves and Jacobians with complex multiplication
… algebraic curve and a finite volume hyperbolic orbifold which admits an algebraic and isometric immersion into the moduli space of genus two Riemann surfaces. The Weierstrass curves are the main examples of Teichmüller curves in genus two. The primary goal of this thesis is to determine the …
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An Orbifold Geometry in Holography, or: How the spindle fits into supergravity and supersymmetric quantum field theory
L'abstract è presente nell'allegato / the abstract is in the attachment
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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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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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Aspects of the (0,2)-McKay Correspondence
… focusing</p><p> on the cases where the orbifold has an isolated singularity. We prove a lower bound on the number </p><p>of deformations of the tangent bundle for any crepant resolution of this orbifold. We show that this lower bound is achieved when the resolution used is the …
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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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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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Counting coloured boxes
… SO(3). These generating functions turn out to be orbifold Donaldson-Thomas partition functions for the orbifold [C³/G]. We need only the vertex operator methods of Okounkov-Reshetikhin-Vafa for the easy case G = Zn; to handle the considerably more difficult case G = Z₂ x Z₂ , we will also use a …
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Eta-invariants and Molien series for unimodular group
… a geometrical point of view, Cn/[Gamma] is an orbifold with boundary S2n-1/[Gamma]. We define and compute the corresponding orbifold [eta]-invariant. From an algebraic point of view, we look at the algebraic variety Cn/[Gamma] and we analyze the associated Molien series. The main result is …
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Quasi-elliptic cohomology
… $\mathbb{Z}[q^{\pm}]$. In Chapter 2 we build an orbifold version of the theory, inspired by Devoto's equivariant Tate K-theory. In Chapter 3 we construct power operation in the orbifold theory, and prove a version of Strickland's theorem on symmetric equivariant cohomology modulo transfer ideals. …
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5D Supersymmetric Orbifolds: Supergravity/Phenomenological Aspects
… supersymmetric theories compactified on the orbifold S1/Z2. We start with a short discussion of power-law unification, where 5D rigid super Yang-Mills theory is introduced in its superfield formulation. We develop a superfield description of 5D orbifold N = 2 supergravity coupled to vector …
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Torus equivariant elliptic cohomology and sigma orientations
… and relates these sections to the elliptic orbifold genera.
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Toric Varieties Associated with Moduli Spaces
… (rational) cohomology ring in the smooth (orbifold) case, we show that the aforementioned toric varieties almost always possess singularities worse than those of an orbifold. In these cases we use an algorithm of Bressler and Lunts to recover the intersection cohomology Betti numbers using …
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Two-dimensional twisted sigma models and chiral differential operators
… study the half-twisted sigma model on a complex orbifold X/G, where G is an isometry group of X. Via this orbifold sigma model, we obtain a purely physical interpretation of a recently constructed mathematical theory of CDR on orbifolds.Finally, we study the half-twisted sigma model coupled to a …
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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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Volume Formula and Intersection Pairings of N-fold Reduced Products
… appropriate assumptions, it is a symplectic orbifold. Using the technique of nonabelian localization and the residue formula of Jeffrey and Kirwan, we investigate the symplectic volume and the intersection pairings of an N-fold reduced product of G. In 2008, Suzuki and Takakura gave a volume …
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