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 17 of 17 for “"Extra Dimensions"”.
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Traces of Extra Dimensions in Cosmology
… we discuss the observational consequences of extra dimensions on cosmological phenomena. We begin with an overview of extra dimensions, from the initial ideas of Kaluza and Klein to the more recent concept of braneworld models and in particular review the cosmological aspects of the DGP …
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Superfield calculation of loop contribution in extra dimensional theories
… of the Kaluza-Klein states, associated with extra dimensions, to the renormalization group beta function. These Kaluza-Klein particles circulate in the virtual loop, hence affecting the overall corrections at any order. We obtain the one-loop correction, which checks with the result …
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Brane worlds, brane worlds : it's party time : excellent
… in terms of the beta functions and anomalous dimensions of the fields. This spectrum is also largely flavor blind, and thus does not suffer from flavor changing neutral current problems. Anomaly mediation, however, predicts negative slepton mass squardes. In this thesis we will try to address …
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Brane cosmology in string/M-theory and cosmological parameters estimation.
… potential are negligible. Using the large extra dimensions, I also show that the cosmological constant can be lowered to its current observational value. Applying the formulas to cosmology, I study several models in the two theories, and find that a late transient acceleration of the …
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The standard model in 5D : theoretical consistency and experimental constraints
… the standard model of particle physics with an extra dimension at the TeV-scale. We assume that some of the gauge and Higgs bosons propagate in one additional spatial dimension, while matter fields are confined to a four-dimensional subspace, the usual Minkowski space. After compactification on …
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Topics in Cosmic Acceleration and Braneworlds
<p>Cosmic acceleration has come to be a standard, and perhaps required, ingredient in our current understanding of the universe. In the early universe, under the name of inflation, a phase of accelerated expansion is used to solve many problems with the standard Hot Big Bang cosmology. In the late …
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Die Methode der nichtlokalen effektiven Wirkung in höherdimensionalen Raumzeitmodellen
Among the most promising candidates for a unified description of quantum <br>theory and gravitation is superstring theory. It predicts the existence of <br>multidimensional stable objects called "branes" (short for membranes). On <br>these branes open strings can end, which also means that the …
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Heterotic Braneworld Gravity
… Horava-Witten M-theory, where six of the eleven dimensions have been compactified on a Calabi-Yau manifold. The solution consists of two parallel three-branes separated by the 11th dimension with a scalar field in the bulk. In this dissertation we review some of the alternative theories of …
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Branes, graphs and singularities
… theory that rely on a fibration structure of the extra dimensions. Non-geometric spaces preserving .A = 1 supersymmetry in four dimensions are obtained by using T-dualities as monodromies. Several examples are discussed, some of which admit an asymmetric orbifold description. We explore the …
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Particle Physics in the LHC Era
<p>During the past 100 years experimental particle physicists have collected an impressive amount of data. Theorists have also come to understand this data extremely well. It was in the first half of the 20th century the efforts of the early pioneers of quantum mechanics laid the ground work for …
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Holographic and Composite Models of the Axion
… gravity. We propose a series of composite and extra dimensional axion models. A basic 5-dimensional model first incorporates the known forces while keeping the axion consistent with gravitational corrections. More sophisticated extensions address other problems in particle physics unrelated to …
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An essay on liability insurance and accident compensation and five papers on liability insurance
… both. It is argued that this phenomenon takes on extra dimensions in the context of liability insurance, creating additional layers of uncertainty for insurers and greater potential instability for liability insurance systems. Part 5 examines a connected issue: the relationship between liability …
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Holographic view of non-relativistic physics
… this duality is that the bulk geometry has two extra dimensions than the CFT, instead of the usual one. The additional direction is a compact direction and shift symmetry along this direction corresponds to the particle number transformation. This solution can be embedded into string theory by …
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Stationary Anti-de Sitter Black Hole Solutions in and out of Equilibrium
… which is a string theory-inspired mechanism for extra dimensions in our Universe. We present such rotating braneworld black hole solutions, which closely resemble standard Kerr black holes at large scales, supporting the phenomenological viability of the braneworld model. We shall discuss how …
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Nonperturbative dynamics of strong interactions from gauge/gravity duality
This thesis studies important dynamical observables of strong interactions such as form factors. It is known that Quantum Chromodynamics (QCD) is a theory which describes strong interactions. For large energies, one can apply perturbative techniques to solve some of the QCD problems. However, for …
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MISSING TRANSVERSE ENERGY MEASUREMENT IN ATLAS DETECTOR:FIRST LHC DATA RESULTS AND IMPORTANCE FOR PHYSICS STUDY
… for new physics such as supersymmetry and extra dimensions. A miss measurement in terms of linearity and resolution is crucial for good ET the efficient and accurate reconstruction of the Higgs boson mass when the Higgs boson decays to a pair of τ -leptons. miss in ATLAS with real This …