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 47 for “"Branes."”.
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Branes, graphs and singularities
… and nongeometric backgrounds in the presence of branes. In the first part of the thesis, we study non-compact geometries. We introduce "brane tilings" which efficiently encode the gauge group, matter content and superpotential of various quiver gauge theories that arise as low-energy effective …
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D-branes and K-homology
… spacetime manifold $X$ of string theory and D-branes in string theory is examined. An element of the $K$-homology group is given by an equivalence class of $K$-cycles $[M,E,\phi]$, where $M$ is a closed spin$^c$ manifold, $E$ is a complex vector bundle over $M$, and $\phi: M\rightarrow X$ is a …
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D-branes on Calabi-Yau Spaces
In this thesis the properties of D-branes on Calabi–Yau spaces are investigated. Compactifications of type II string theories on these spaces to which D-branes are added lead to N = 1 supersymmetric gauge theories on the world-volume of these D-branes. Both the Calabi–Yau spaces and the D-branes …
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Multiple M-branes and 3-algebras
… does not possess string states but rather M2-branes and M5-branes. The purpose of this thesis is to explore the properties of multiple coincident M2- and M5-branes. It is based on the author’s papers [1, 2] (in collaboration with Neil Lambert), [3] (in collaboration with Imtak Jeon and Neil …
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Kaluza-Klein Theories, Branes and Cosmology
… The time independence of the deficit angle branes is proven. Some special cases are solved, but for a solution of the most general case, many difficulties have still to be overcome. These difficulties are explained and a strategy for their possible solution is developed.
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D-branes and string field theory
In this thesis we study the D-brane physics in the context of Witten's cubic string field theory. We compute first few terms the low energy effective action for the non-abelian gauge field A, from Witten's action. We show that after the appropriate field redefinition which relates the string field …
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Supersymmetric gauge theories from D3-branes on singularities
… wall in a theory which can be realized on D3-branes at the apex of the complex cone over the zeroth Hirzebruch surface with the addition of fractional branes. Next, we compute global U(1) charges for the matter fields of the del Pezzo gauge theories and formulate several of their features in …
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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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D-branes, gauge theory and string field theory
… string dynamics, i.e., the splitting of branes on the orientifold planes. In the second direction, we develop the "inverse algorithm" and use it to get nontrivial world volume theories of D-branes probing more exotic singularities. In this process, we find the "toric duality" which …
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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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Colliding branes and formation of spacetime singularities in superstring theory.
… of space-times containing two timelike colliding branes is made, in the framework of 10-dimensional string theory. After developing the general formulas to describe such events, we study several classes of exact solutions and space-time singularities in both the (D+d)-dimensional string theory and …
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Aspects of Generalized Geometry: Branes with Boundary, Blow-ups, Brackets and Bundles
… complex manifolds, so-called Lagrangian branes with boundary. We establish a correspondence between stable generalized complex geometry and log symplectic geometry, which allows us to prove results on local neighbourhoods and small deformations of this new type of submanifold. We further …
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Duality and dynamics of supersymmetric field theories from D-branes on singularities
… regarding gauge theories on the worldvolume of D-branes probing toric singularities. We first study the connection that arises in Toric Duality between different dual gauge theory phases and the multiplicity of fields in the gauged linear sigma models associated with the probed geometries. We …
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Topological BPS charges in 10- and 11-dimensional supergravity
… to the topological charges of the various BPS branes of the IIA, IIB and $D=11$ supergravity theories. These expressions are related to the structure of the SUSY algebras in curved spacetimes. We consider charges for all the M-, NS- and D-branes as well as the Kaluza-Klein monopoles. …
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Die Methode der nichtlokalen effektiven Wirkung in höherdimensionalen Raumzeitmodellen
… of <br>multidimensional stable objects called "branes" (short for membranes). On <br>these branes open strings can end, which also means that the gauge fields <br>associated with the ends of a string reside on the branes. Gauge fields, <br>rather than spreading through the entire ten-dimensional …
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Suppressions and cascades : insights from gauge/gravity dualities
… describe the low-energy limit of systems of D-branes. In this dissertation, I use the AdS/CFT correspondence to study the dispersion relations of mesons in a particular hot, strongly coupled, supersymmetric gauge theory plasma. This plasma arises by placing a probe D7-brane in the near-horizon …
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Analysis of supersymmetric field theories via AdS/CFT, brane setups and matrix models
… takes place or not. The splitting of NS5-branes and D(p+2)-branes on orientifold Op-planes is analyzed. The rules governing this process are derived and checked in the case p = 4 by means of Seiberg-Witten curves.
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On D-brane configurations and ADS/CFT duality
… while the other has to do with the particle-like branes appearing in relation to the AdS/CFT conjecture. After a general introductory chapter to the strings, branes and dualities, each research work appears in a separate part of the thesis (parts I, II). Conclusions are given at the end of each …
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Aspects Of Phenomenology And Cosmology In Heterotic M-Theory
… Finally, it is known that M-theory admits five-branes, which wrap holomorphic curves upon dimensional compactification. We construct an effective N=1 supersymmetric action to describe the world-volume theory of the resulting three-branes, which live in the bulk space of heterotic M-theory.
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