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 8 of 8 for “"Path Integral Approach"”.
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Atoms on a Worldline: A Path-Integral Approach to Electromagnetic Casimir Energies
… tools for Casimir physics, the worldline path-integral approach provides a powerful alternative to traditional mode summation and scattering approaches by reformulating the quantum vacuum energy in terms of an ensemble of fluctuating particle paths. The worldline method offers strong …
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A continuum path integral approach to the simulation of a unitary gas
… i.e.the scattering length $a_{s}=-\infty$. A path integral Monte Carlo simulation of such a system is performed using an exact novel zero-range, delta function pair propagator which has been tuned to the unitary limit so that essentially all interactions amongst the interacting particles are …
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The effects of instantons in a finite temperature quantum field theory
In this thesis we describe the Euclidean path integral approach and instanton methods for investigating a SU(2) Yang-Mills theory at finite temperature. We first begin with a review of tunneling in a one-dimensional periodic potential. Here we introduce the methods of Euclidean path integrals and …
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Markov switching and jump diffusion models with applications in mathematical finance
… volatility of stock prices. We also use a path integral approach for a two-state Markov switching diffusion model, and it turns out that the transition probability density is a weighted average of gaussian densities for this model. As we will see in this thesis, the models can be extended …
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Atomistic quantum dynamics: implementation and applications of the quantum-classical path integral method
… been proposed, beginning with averaged-force approaches in the earliest days of quantum theory and continuing through many new variations and improvements. Unfortunately, owing to the differences between quantum and classical mechanics, most such methods must resort to ad hoc assumptions in …
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Work, power, and resetting statistics in stochastic models of physical systems under drive
… a more standard resetting problem and, using a path-integral approach, derive several results related to the temporal and stress statistics in this regime. These include a proof of the existence of a stress fluctuation theorem given conditions on the local resetting criterion, as well as a …
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Theory of voltage oscillations in ultra-small capacitance Josephson junctions
… phenomenological model are in Chapter 4. Using a path integral approach, the translational properties of the phase are treated using a winding number description, and it is shown that for ohmic dissipation the phase may be treated as an extended coordinate. It is then shown that the Bloch …
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Global dynamics of the universe
… of ambiguity. When one follows a perturbative approach, there is an additional freedom of choosing a gauge, which makes it ambiguous what one means by a perturbation of a physical quantity, even when this quantity does not depend on the local choice of frame. By specifying a choice of gauge, it …