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 “"M-theory"”.
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Aspects Of Phenomenology And Cosmology In Heterotic M-Theory
… which arise from the E_8 x E_8 heterotic string theory and its strong-coupled limit, known as heterotic M-theory. We first re-examine the B-L MSSM, a realistic supersymmetric extension of the Standard Model, in a more generic region of moduli space. We modify our previous analysis by demanding …
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Supersymmetric backgrounds of M-theory and AdS4/CFT3 correspondence
… IR fixed point of a mass deformation of the ABJM theory, we also find new solutions which are dual to cubic deformations. In particular, we find a new supersymmetric warped AdS4×S7 solution with non-trivial four-form flux. Furthermore, we study supersymmetric asymptotically locally AdS4 solutions …
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Aspects of higher dimensional Einstein theory and M-theory
… two main themes. The first is Einstein's theory of general relativity in higher dimensions, while the second is M-theory. The first part of the thesis concerns the use of classification techniques based on the Weyl curvature in an attempt to systematically study higher dimensional general …
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Brane cosmology in string/M-theory and cosmological parameters estimation.
… cosmic acceleration of the universe in string/M theory. In Part I, after developing two highly successful numerical codes, I apply them to study the holographical dark energy model and LCMD model with curvature. By fitting these models with the most recent observations, I find various tight …
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Black holes and solitons in string theory and M-theory: a low energy limit analysis
… higher-curvature corrections from superstring theory on black hole and soliton physics in different dimensions. The first order α ′−corrections derived from heterotic string theory, up to a field redefinition, lead to Einstein-dilaton-Gauss-Bonnet theory. We construct the first-order correction …
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Higher Derivative Corrections to the Low-Energy E ective Action of Type IIA/B String Theory and M-theory
… eective theories of type IIA and IIB string theory. In addition, the unique eleven dimensional supergravity theory is the low-energy eective action of M-theory. Higher order corrections to the low-energy eective actions of these supergravity theories contain perturbative and non-perturbative …
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Multiple M-branes and 3-algebras
M-theory is well-known but not well-understood. It arises as an umbrella theory that unifies the various perturbative string theories into a single nonperturbative theory. In its strong coupling phase M-theory does not possess string states but rather M2-branes and M5-branes. The purpose of this …
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MODERN TOPICS IN SUPERSYMMETRY
Quantum field theory (QFT) stands as one of the most remarkable mathematical frameworks for understanding fundamental particles and their interactions. Its predictive power has delivered profound insights into the behavior of particles, culminating in the Standard Model of particle physics. …
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Topics in gauge/gravity duality
… years, the Anti-de Sitter (AdS)/Conformal Field Theory (CFT) correspondence and its generalization in the ideas of gauge/gravity duality have had a profound impact in our understanding of strongly interacting quantum field theories. Roughly speaking, the correspondence maps the degrees of freedom …
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New Classical Solutions in Supergravity
… second class contains a large number of String/M theory solutions that have Lifshitz or Schrodinger scaling symmetry, obtained from marginally deforming the geometry of internal dimensions of previous solutions. We propose that these new solutions are dual to marginal deformations of certain …
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Theory and practice of debt financing in REITs
Miller and Modigliani's classic finance theory proposes that debt does not add to a firm's value in the absence of corporate tax. Real Estate Investment Trusts (REITs) have no corporate level income tax and meet M & M's perfect market assumption. In reality, however, REIT operators use a …
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Pulsed mm-Wave electron cyclotron maser experiments
… to design the system and the general E. C. M. theory developed previously.
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Heterotic Braneworld Gravity
… Waldram (LOSW) is derived from 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 …
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Electroreflectance of germanium
… point was obtained. A good fit to the 3-D M theory was also obtained for the spin orbit split structure (r7 ~ r7 transitions at 1.08 eV) and was used as a means of determining the electric field. A doublet structure at 2.1-2.3 eV was shown to agree extremely well with the 2-dimensional M …
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Supersymmetric Schur functions and Lie superalgebra representations
… in quantum mechanics, nuclear physics, string theory, conformal field theory, supergravity, M-theory, lattice QCD, solvable lattice models, spin systems and quantum systems. The representation theory of Lie superalgebras and in particular of gl(m|n) or its simple counterpart sl(m|n), is not a …
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The use of coated micropowders to reduce radiation heat transfer in foam insulation
… with diameters between 8 and 30 [mu]m. Theory predicts that the smaller the particle size, the larger the resulting improvement in extinction coefficient. The coatings required for opacity are less than 0.1 [mu]m thick, composing less than 7% of the overall volume of the powder. The …
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Lessons on interacting quantum field theories from string theory
In this thesis, we use string theory constructions and dualities to explore various features of interacting quantum field theories. We begin with an overview in Chapter 1, of past and recent developments in quantum field theories, explaining the advantages of string theoretic techniques over …
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Dynamical studies in relativistic cosmology
… dust cosmologies in Einstein's classical theory either the expansion vanishes or the flow is irrotational - has an analogue in the Kaluza-Klein universe model, which has its roots presumably in string theory (or M-theory), recently proposed by Randall and Sundrum. The Big Bang singularity …
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