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 117 for “"non-perturbative"”.
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Aspects of Non-Perturbative Renormalization
… a presentation of some key issues regarding the non-perturbative renormalization of the periodic scalar field theories. As an example of the non-perturbative methods, we use the differential renormalization group approach, particularly the Wegner-Houghton and the Polchinski renormalization group …
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Non-perturbative approaches to strongly correlated electron systems
… strongly correlated electron systems requires a non-perturbative analysis because Fermi liquid theory inevitably breaks down due to the strong correlation. In this thesis, we will study two non-perturbative approaches to tackle strongly correlated electronic system: 1.) multi-dimensional …
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Some non-perturbative results in relativistic field theory
This thesis contains the descriptions of two new non-perturbative results in relativistic field theory. The first part of the thesis describes a transformation which can be used to relate the strong coupling limit of the (theta 4)3 quantum field theory to the weak coupling limit of the same theory. …
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Non-perturbative electron beam characterization with a microwiggler
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Non-perturbative determination of Karsch Coefficients in 2 Colour QCD
… diagram at finite temperature and zero density. Non-zero density is implemented on the lattice using the chemical potential however this gives a possibility of a complex probability which means the statistical machinery normally used breaks down. Switching the gauge group from three colour to two …
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Flux compactifications of Type II string theories under non-perturbative dualities
… and their transformations under a set of non-perturbative dualities. The dualities are the Type IIA-IIB exchanging T duality, the self-symmetry of Type IIB S duality, the non-trivial combination of the two, U duality, and the generalisation of T duality to include Calabi-Yaus, mirror …
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Non-Perturbative studies of quantum field theories with classical and quantum simulations
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-12-01
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Topics in Supersymmetry: Implications for Cosmology and Non-Perturbative Studies on a Spacetime Lattice
<p>Moduli fields, scalar fields which parametrize different vacuum states of a given theory, are commonly predicted to exist within compactifications of UV complete theories, and in particular those theories exhibiting supersymmetry. But if such theories' dynamics are present during the …
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Perturbative and non perturbative effects in the Standard Model and orbifolded ADS/CFT based theories
We study some perturbative and nonperturbative effects in the framework of the Standard Model of particle physics. In particular we consider the time dependence of the Higgs vacuum expectation value given by the dynamics of the StandardModel and study the non-adiabatic production of both bosons and …
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Two topics in non-perturbative lattice field theories : the U(1) quantum link model and perfect actions for scalar theories
… aspects of renormalization group flow and non-perturbative improvement of actions for scalar theories regularized on a lattice. We construct a perfect action, an action which is free of lattice artifacts, for a given theory. It is shown how a good approximation to the perfect action - …
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Higher Derivative Corrections to the Low-Energy E ective Action of Type IIA/B String Theory and M-theory
… actions of these supergravity theories contain perturbative and non-perturbative eects<br/>of the corresponding string theories and, as such, understanding the structure of the higher order terms provides an insight into the perturbative and non-perturbative formulations of string theory. The …
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Geometry and entanglement in AdS/CFT and beyond
Holographic duality is the most well-understood non-perturbative framework of quantum gravity that we have. In particular, it has revealed a deep connection between quantum entanglement and the dual gravitational geometry. A semiclassical analysis on geometries has shed insights on the …
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Field theoretical methods for strongly correlated electron systems
… matter physics, particularly to problems where a non-perturbative treatment is required.
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Light-Matter Interactions with Photonic Quasiparticles
… optical properties of these excitations, in perturbative and non-perturbative regimes of QED, which give rise to new schemes for generating entangled photons, for X-ray sources, and even for high-energy particle detectors. The second major part of this thesis develops the new physics arising …
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The cosmological bootstrap and the analytic wavefunction
… for the S-matrix bootstrap, which provides non-perturbative constraints for scattering. We show that analyticity in the wavefunction is also linked to causality. We study the analytic structure of the wavefunction in detail and demonstrate the relation between singularities in amplitudes and …
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Monte-Carlo event generation for the LHC
… generators, are improved in areas related to the perturbative as well as non-perturbative regions of strong interactions. A short introduction to the main principles of event generation is given to serve as a basis for the following discussion. An existing algorithm for the correction of …
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The Phase of the Cosmological Wavefunction
… provide a complete description of graviton non-Gaussianities in single-clock inflation and new tools for interpreting upcoming cosmic microwave background and large-scale structure data. The second part establishes a non-perturbative framework for understanding CPT symmetry in cosmology. We …
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Automated hydrodynamic trap for single cell analysis in free solution
… action of gentle fluid flow, thereby enabling non-perturbative trapping of cells for long time scales. Recent studies have reported the ability of biological systems to implement lowpass filters to distinguish high frequency noise in environmental stimuli from lower frequency input signals. …
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Measurement of charged particle multiplicity distribution in Au + Au collisions up to 200 GeV
… a strongly interacting many-body system in this non-perturbative regime. Therefore, characterizing the collisions using global extrinsic observables becomes important. The distribution of charged particles produced in an ultra-relativistic heavy ion collision, being proportional to the initial …
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