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 19 of 19 for “"effective theories"”.
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Towards Effective Theories for Deep Learning and Beyond
… Besides, we have been working on new AI theories and algorithms that go beyond deep learning and a new AI programming system that aims to make the implementation of these new ideas possible. It goes beyond the scope of a PhD to finish a demonstration of the new AI, but we aim to show …
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New effective theories of gravitation and their phenomenological consequences
… of this Thesis is to explore Poincaré Gauge theories of gravity and expose some contributions to this field, which are detailed below. Moreover, a novel ultraviolet non-local extension of this theory shall be provided, and it will be shown that it can be ghost- and singularity-free at the …
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The Cauchy problem and the initial data problem in effective theories of gravity
Lovelock and Horndeski theories of gravity are diffeomorphism-invariant theories with second-order equations of motion. A subset of these theories can be motivated by effective field theory considerations and hence they could describe strong-field deviations from general relativity. In particular, …
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Exotic States in Quarkonium Physics: Effective Theories of Heavy Mesonic Molecules and an AdS/QCD Model of Hybrid Quarkonium
… Two approaches to achieve</p><p>this end are effective field theories and gauge/gravity dualities. The former involves</p><p>a field theory more or less like QCD itself, but with states which are composites</p><p>of quarks and gluons. Then a perturbative expansion is made not in terms of …
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Challenges to Effective Realism
That a theory is merely effective has historically counted against it, especially in pro-realism discourse. For example, many realists take the interpretation of a theory to amount to specifying what the world would be like was the theory true (or characterizing the possible worlds picked out by …
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A Study on Heterotic Target Space Duality – Bundle Stability/Holomorphy, F-theory and LG Spectra
… leading to apparently identical target space theories. To date, this duality has largely been studied at the level of counting states in the effective theories. We extend this analysis in several ways. First, we consider the correspondence including the effective potential and loci of enhanced …
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Strongly Correlated Electrons on a Triangular Lattice
… 2, we discuss the derivation of low energy effective theories by using perturbation theory. In chapter 3, we point out potential problems with perturbative techniques used to construct low energy theories for SCES. In chapter 4, we introduce an important class of materials, namely the …
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Studies of superconformal field theories using GLSM and conformal bootstrap
… study strongly interacting superconformal field theories in two and three dimensions. In two dimensions, we investigate N = (0, 2) gauge theories using the gauged linear sigma models (GLSM). In those theories, we identify simple mechanism by which worldsheet description of H-flux satisfying …
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Colliding branes and formation of spacetime singularities in superstring theory.
… string theory and its D-dimensional effective theory, obtained by Kaluza-Klein compactification. It is found that space-time singularities in the low dimensional effective theory may or may not remain after lifted to the (D+d)-dimensional string theory, depending on the specific …
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Two quantum effects in the theory of gravitation
… of treating general relativity as an effective quantum field theory will be examined. The primary result will be the calculation of the first-order quantum gravity corrections to the [beta] functions of arbitrary Yang-Mills theories. These corrections will effect the high-energy …
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Exploration of nucleon structure in lattice QCD with chiral quarks
… and to test the applicability of low-energy effective theories. Finally, we compare the results from lattice QCD calculations with two different discretization methods and lattice spacings, with the rest of the calculation technique kept equal. The level of agreement between these results …
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Extending the Geometric Tools of Heterotic String Compactification and Dualities
… this context, each half of the ``dual" heterotic theories must, in turn, have an F-theory dual. Moreover, the apparent relationship between two heterotic compactifications seen in (0,2) heterotic target space dual pairs should, in principle, induce some putative correspondence between the dual …
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Applications of Numerical Methods in Heterotic Calabi-Yau Compactification
… in determining the validity of the low energy effective theories used in the description of Calabi-Yau compactifications. The numerical techniques for obtaining Hermitian Yang-Mills connections are applied in two different fashions in this thesis. First, we demonstrate that they can be …
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Microscopic computations in the fractional quantum hall effect
… measurements on quantum Hall systems, effective theories are usually employed such as the chiral Luttinger liquid system. In this thesis the Monte Carlo method is used for Laughlin-type quantum Hall systems to compute microscopic observables. In particular such computations are carried …
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Effective Field Theory for Doubly Heavy Baryons and Lattice QCD
<p>In this thesis, we study effective field theories for doubly heavy baryons and lattice QCD. We construct a chiral Lagrangian for doubly heavy baryons and heavy mesons that is invariant under heavy quark-diquark symmetry at leading order and includes the leading O(1/m_Q ) symmetry violating …
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Branes, graphs and singularities
… and superpotential of various quiver gauge theories that arise as low-energy effective theories for D-branes probing singular non-compact Calabi-Yau spaces with toric symmetries. Brane tilings also offer a generalization of the AdS/CFT correspondence. A technique is developed which enables …
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An Action Research Investigation into Pedagogies of Enactment in Initial Teacher Education to Support Pre-Service Primary Teachers to teach Mathematics for Relational Understanding.
… describes a teacher’s inability to translate effective theories of teaching into practice, and as a result they fail to produce effective classroom learning. It is common for pre-service teachers (PSTs) to experience the problem of enactment, and invariably they tend to enact instructional …
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W-pair production near threshold in unstable particle effective theory
… performed in the framework of unstable-particle effective theory, which allows for a gauge-invariant inclusion of instability effects, and for a systematic approximation of the full cross section with an expansion in the coupling constants, the ratio Gamma_W/M_W, and the non relativistic velocity …
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Cold-start universal information extraction
… or genre. The focus of this thesis is to develop effective theories and algorithms for IE which not only yield satisfactory quality by incorporating prior linguistic and semantic knowledge, but also greater portability and scalability by moving away from the high cost and narrow focus of …