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Showing 1 to 16 of 16 for “"Casimir Effect"”.
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Phonon-mediated Casimir effect
The Casimir interaction is the fundamental physical phenomenon which emerges due to modification of vacuum fluctuations by boundaries in a confined area of space. It arises in many fields of physics, including condensed matter. Recently, substantial interest in the Casimir effect has revived as a …
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An optical approximation to the Casimir effect and related topics
… thesis, I have studied the dependence of the Casimir force between neutral conductors on their shapes. After reducing the problem to that of finding the density of states of' an appropriate hamiltonian I studied it by using semiclassical methods. Some exemplary geometries of interest for the …
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Cavity QED with superconductors and its application to the Casimir effect
Diese Diplomarbeit untersucht den Casimir-Effekt zwischen normal- und supraleitenden Platten über einen weiten Temperaturbereich, sowie die Casimir-Polder-Wechselwirkung zwischen einem Atom und einer solchen Oberfläche. Hierzu wurden vorwiegend numerische und asymptotische Rechnungen durchgeführt. …
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On Quantum Reflection and The Casimir Effect : Application to atom-surface scattering
… The parameters of the long-range attractive Casimir-van der Waals potential extracted from the fits to the corrected data show excellent agreement with the values given in literature. The analysis of the reflection coefficient from alpha-quartz forms the first experimental confirmation of the …
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A quantum top in a Casimir-induced quadrupole field
The Casimir energy is the change in energy of a configuration of objects due to second quantization of the electromagnetic field. The Casimir energy of a dielectric object inside a perfectly conducting sphere was recently analyzed [1]. Building on this result, I calculate the changes in energy …
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Casimir-Polder interaction in second quantization
The Casimir-Polder interaction between a single neutral atom and a nearby surface, arising from the (quantum and thermal) fluctuations of the electromagnetic field, is a cornerstone of cavity quantum electrodynamics (cQED), and theoretically well established. Recently, Bose-Einstein condensates …
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Inflationary cosmology and fundamental physics
… topics: oscillons, entanglement entropy, and the Casimir effect. In particular, we compute the quantum decay of oscillons, finding it to be dramatically different to the classical decay; we establish finite contributions to the entanglement entropy between a pair of regions, including a finite …
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Fluctuation-induced phenomena in non-equilibrium systems
… topics in physics including the dynamical Casimir effect in the presence of moving boundaries, and non-contact friction between objects in relative motion. In both cases, photons are created due to the coupling of the motion and zero-point fluctuations in the vacuum, resulting in …
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Fluctuating surface currents : a new algorithm for efficient prediction of Casimir interactions among arbitrary materials in arbitrary geometries
For most of its 60 year history, the Casimir effect was an obscure theoretical backwater, but technological advances over the past decade have promoted this curious manifestation of quantum and thermal fluctuations to a position of central importance in modern experimental physics. Dramatic …
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Investigation into compactifed dimensions : Casimir energies and phenomenological aspects.
… two are particularly striking. First, the Casimir Effect, which will be examined in detail in this dissertation is arguably the most salient manifestation of the quantum vacuum. In its most basic form it is realized through the interaction of a pair of neutral parallel conducting plates. …
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Spectral functions for generalized piston configurations.
… on these various configurations, we obtain the Casimir force and the one-loop effective action for these systems as the values at s= -½ and the derivative at s = 0. Information about the heat kernel coefficients can also be found in the spectral zeta function in the form of residues, which …
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Quantum critical matter: Casimir pairing, emergent orders and topological defects
… critical fluctuations, that is similar to a Casimir effect. The Casimir pairing mechanism has conceptual similarities with chiral bag models in quantum chromodynamics and is generic for a wide class of quantum phase transitions. Second, we consider an impurity screening problem in a 3D magnet …
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Optical nonlinear effects and photon pair production in modulated materials
… from the zero-point energy. This surprising effect is known as the dynamical Casimir effect (DCE). In this thesis, we focus our attention on using the DCE as a route to experimentally study the quantum vacuum. Initially we explore experimental approaches that rely on an oscillation of vacuum …
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Casimir Force in Non-Planar Geometric Configurations
The Casimir force for charge-neutral, perfect conductors of non-planar geometric configurations have been investigated. The configurations were: (1) the plate-hemisphere, (2) the hemisphere-hemisphere and (3) the spherical shell. The resulting Casimir forces for these physical arrangements have …
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Dinamica effettiva di sistemi quantistici driven chiusi e aperti
… errors have to be taken into account. First, the effects of the interaction of the system with an environment of uncontrollable degrees of freedom which may determine the loss of coherence. Second, imperfections in the control may introduce errors in performing quantum gates. Third, leakage from …