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 57 for “"brane"”.
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Brane worlds, brane worlds : it's party time : excellent
In recent years branes have had significant impact in the construction of higher dimensional theories of SUSY breaking, and of gravitational phenomena. In particular they provide strong motivation for considering anomaly mediation as a mechanism of SUSY breaking communication. Anomaly mediation …
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Intersecting brane landscape
This thesis studies intersecting brane models, which are a class of quasi-realistic compactifications of string theory. Techniques are developed for exploring the complete space of intersecting brane models on an orientifold. The classification of all solutions for the widely-studied T6/Z2 x Z2 …
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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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Brane cosmology in string/M-theory and cosmological parameters estimation.
… the general formulas to describe orbifold branes in both string and M theories, and then systematical study the two most important issues: (1) the radion stability and radion mass; and (2) the localization of gravity, the effective 4D Newtonian potential. I find that the radion is stable …
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Higgs-Portal and Z'-Portal Dark Matters in Brane-World Cosmologies
… DM model within the framework of 5-dimensional brane-world cosmology. In this setup, our familiar 3-dimensional space is realized as a hyper-surface embedded in a 4-dimensional space. Within this context, all SM and DM fields are confined to the hyper-surface, while the graviton resides in the …
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Black brane solutions of Einstein-scalar-Maxwell gravity and their holographic applications
… numerical solutions (we mainly focus on black brane solutions, i.e. solutions with a planar event horizon). Moreover, we discuss hyperscaling violation, a particular scaling behavior of free energy and entropy (as functions of the temperature), typical of some phase transitions of real …
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The role of string junctions in the spectrum of D-brane theories
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1999.
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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 algebraic singularities, finite graphs and D-brane gauge theories : a string theoretic perspective -- with a digression on string field theory
… engineering, Hanany-Witten setups and D-brane probes. We present the work of the author in the past 4 years at the Centre for Theoretical Physics, on aspects of the world-volume gauge dynamics using D-brane resolutions of various Calabi-Yau singularities, notably Gorenstein quotients and …
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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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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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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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Open strings and analytic non-integrability
… tested for open strings ending on a D5 and D7 brane. Two variations are used for the metric of the D7 brane. These are the S 2 × S 2 and the nested S 4 metrics of the S 5 . The method was able to reproduce the expected results for the D5 brane and the giant graviton. This is a strong indication …
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Morita Equivalence and Generalized Kähler Geometry
… equivalence relating them, and a Lagrangian brane inside of the Morita equivalence. We apply this reformulation to solve the longstanding problem of representing the metric of a GK structure in terms of a real-valued potential function. This generalizes the situation in Kähler geometry, where …
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Three lessons in causality : what string theory has to say about naked singularities, time travel and horizon complementarity
… corresponding to a distribution of BPS D6-branes wrapped on K3, obtained as extremal limits of a rotating solution. The geometry's unphysical regions resulting from the wrapping can be repaired by the enhancon mechanism, with the result that there are two nested enhancon shells. For a range …
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On hadrons and inflatons: the holography of strongly coupled processes
… as the endpoints of a string which lie on a D7-brane – the brane is embedded in a dilaton-flow geometry that exhibits such QCD-like properties as confinement. Upon breaking the string at its midpoint and reattaching it to the brane, a kink is imposed, which propagates to the end of the string …
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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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Heterotic Braneworld Gravity
… decade, there has been considerable interest in braneworld scenarios where the universe lives on a brane in a higher-dimensional bulk and gravity is modified. The heterotic braneworld scenario of Lukas, Ovrut, Stelle and Waldram (LOSW) is derived from Horava-Witten M-theory, where six of the …
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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, gauge theory and string field theory
… theory. In the first direction, we use the brane setup to find mirror pairs of SO(n) and Sp(k) gauge groups for N = 4 three-dimensional gauge field theories. To reach this result, we analyze carefully the s-configuration and predict a nontrivial string dynamics, i.e., the splitting of branes …
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