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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 32 for “"ringdown"”.
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Gravitational wave ringdown as a probe to test general relativity
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-03-01 without embargo terms
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Investigations of Black-Hole Spectra: Purely-Imaginary Modes and Kerr Ringdown Radiation
… using our highly accurate QNM data we model the ringdown, a remnant black hole's decaying radiation. Ringdown occurs in the final stages of such violent astrophysical events as supernovae and black hole collisions. We use our model to analyse the ringdown waveforms from the publicly available …
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Cavity Ringdown Spectroscopy in Nitrogen/Oxygen Mixtures in the Presence of Alpha Radiation
… radiation-induced atmospheric effects. Cavity Ringdown Spectroscopy (CRDS) was used to measure the concentration of chemical products generated as a result of radiation interactions in a controlled atmosphere. Experiments were conducted in a vacuum chamber interfaced with a gas introduction …
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Modeling the Dynamics of Black Hole Systems and the Ringdown of Black Hole Spacetimes
… we describe work to predict and characterize the ringdown gravitational waves from misaligned binary black hole mergers. Working in the large mass ratio limit, we use Teukolsky's equation to calculate the worldline for plunging bodies with varying orbital geometries. Perturbations about Kerr …
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Advancing high power microwave spark-gap technology : design and analysis of a coaxial ringdown oscillator
… limiting their range and effectiveness. Coaxial ringdown oscillators (CROs), a variation of SOs, operate within a coaxial geometry to generate high-power electromagnetic pulses. Current CRO designs can only withstand breakdown voltages up to 100 kV, which limit peak output voltages, and a …
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Efficient Iterative Algorithm for Computing Quasinormal Modes of Black Holes and Information Extraction from Black Hole Ringdown Signal
… analysis of the hole's so called <italic>ringdown radiation</italic>, which is a gravitational wave emitted by a freely oscillating black hole.
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TOWARDS PROBING THE STRONG FIELD GRAVITY USING BINARY BLACK-HOLE RINGDOWNS
<p>In this thesis, we study black hole ringdowns as a probe to understand the strong-field clssical gravity. When two black holes merge, they form a single distorted black hole that then radiates gravitational waves and settles into a final stable Kerr state. The signal produced during this process …
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Application of sensitive spectroscopic techniques to intramolecular dynamics and combustion kinetics
Modifications of Cavity Ringdown Spectroscopy (CRD) for use in the UV region are discussed. These modifications partially overcome the low sensitivity of CRD in the UV (due to lower mirror reflectivity, R - 0.99) by removal of non-exponential contributions to the ringdown decay. We have also …
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A System for Measuring Radiation Induced Chemical Products in Atmospheric Gases Using Optical Detection Methods
… project explored the potential for using Cavity Ringdown Spectroscopy to evaluate the presence of chemical products generated by the air-radiation interaction near an alpha radiation source. In particular, measurements of ozone concentration within a controlled atmosphere chamber as affected by …
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Fast multi-axis tracking of magnetically-resonant passive tags : methods and applications
… interfaces. To this end, we constructed a ringdown tag reader and a swept-frequency tag reader, both capable of real-time continuous interaction with multiple tagged objects. Although the ringdown reader worked well for smaller numbers of tags, the swept-frequency tag reader proved more …
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High-resolution spectroscopic studies of carbon-containing species
… Work to this end was performed using cavity-ringdown spectroscopy and either a gas phase or supercritical fluid supersonic expansion source. Future work will focus on optimizing the supercritical fluid source, in addition to setting up a positive column for the study of molecular ions. …
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A System For Conducting Laser-Induced Fluorescence Measurements On Gas Mixtures Exposed To Alpha Radiation
… to those which can be detected utilizing cavity ringdown spectroscopy. The current model indicates nitric oxide and ozone to be the primary reactants that dictate production rates and concentrations for many of the resulting chemical products. Because strong absorption cross sections for nitric …
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Sensitivity and noise analysis of 4 km laser interferometric gravitational wave antennae
… made through the data for signals from the ringdown of the quasi-normal modes of Kerr black holes. In addition, several possible future improvements to the detectors are outlined.
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Uncovering gravitational wave signatures of modified theories of gravity and exotic matter
… -- scalar polarisation. By focusing on the ringdown and modelling the scalar content of the theory, we forecast the ability of present and future GW detectors to measure it. We find that the ringdown scalar polarisation is undetectable with the current GW detectors, but that scalar ringdown …
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Ab initio Calculations of Optical Rotation
… compared to recently published gas-phase cavity ringdown polarimetry data. When applicable, well-converged Gibbs free energy differences among confomers were determined using complete-basis-set extrapolations of CC energies in order to obtain Boltzmann-averaged specific rotations. The overall …
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Aspects of Black Hole Physics: Scalar Sources, Holography and Gravitational Wave Emission
… exotic compact object and show that the initial ringdown signal cannot be use distinguish between a black hole and a black hole mimicker.
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General Relativistic Black Hole-Neutron Star Simulations: Effects of Black Hole Spin and Binary Mass Ratio
… multiple orbits through inspiral, merger, and ringdown. We evolve the metric using the Baumgarte-Shapiro-Shibata-Nakamura (BSSN) formulation with the standard moving puncture gauge conditions and handle the hydrodynamics with a high-resolution shock-capturing scheme. We explore the effects of …
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Computing and analyzing gravitational radiation in black hole simulations using a new multi-block approach to numerical relativity
… relativity. A systematic method for analyzing ringdown waveforms is proposed. The so called time shift problem, an ambiguity in the definition of excitation amplitudes, is identified and it is shown that this problem can be avoided by looking at appropriately chosen relative mode amplitudes. …
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Making better binary models and modeling distorted black holes using black hole perturbation theory
… transition from inspiral to plunge-merger and ringdown. This allows us to tune and improve the accuracy of EOB. In Newtonian gravity, tidal coupling between members of a binary system has an influence on that binary's dynamics. There are also well-understood connections between the geometry of …
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