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 193 for “"gravitational waves"”.
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Gravitational waves: understanding black holes
This thesis concerns the use of observations of gravitational waves as tools for astronomy and fundamental physics. Gravitational waves are small ripples in spacetime produced by rapidly accelerating masses; their existence has been predicted for almost 100 years, but the first direct evidence of …
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Gravitational Waves in String Cosmology
… the production of cosmological backgrounds of gravitational waves in string theory models of the early universe. After a discussion of stochastic gravitational wave backgrounds, we describe the Cosmic Gravitational Wave Background (CGWB), its sensitivity to ultra-violet physics, and provide …
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Data analysis of continuous gravitational waves
… detectors we do not expect to detect any true Gravitational Wave signals in our data, we can still set upper limits on the strength of the gravitational waves signals. These upper limits, in fact, tell us how weak a signal strength we would detect. We have also used our software to set upper …
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Exploring fundamental physics with gravitational waves
… I explore several topics in the field of gravitational wave astronomy. By means of introduction, I review the historical evolution of humanity's understanding of the mechanics of gravity, and the events which eventually led to the first ever detection of gravitational waves in 2015. The …
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Black Holes, Galaxy Clusters and Gravitational Waves
… theories of gravity using observations of Gravitational Waves (GWs) from the inspiral phase of binary systems. We compare General Relativity predictions to the ones from a Massive Graviton theory. We can discriminate between the two theories and produce posterior probability distribution …
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Experimental gravity with electromagnetic and gravitational waves
Electromagnetic and gravitational observations can be used to elucidate the nature of compact objects and the fundamental properties of the material in their vicinity. Our ability to extract information about the underlying physics from observations of both electromagnetic and gravitational spectra …
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Spinning Black Hole Pairs: Dynamics and Gravitational Waves
… hole binaries will be an important source of gravitational radiation for both ground-based and future space-based gravitational wave detectors. The study of such systems will offer a unique opportunity to test the dynamical predictions of general relativity when gravity is very strong. To …
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Bayesian methods for gravitational waves and neural networks
… the era of the first direct observations of gravitational waves. These are tiny perturbations of space-time that are generated by accelerating matter and affect the measured distances between two points. Observations of these using the laser interferometers, which are the most sensitive …
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Towards detecting gravitational waves from the Crab Pulsar
… impact the ability of the Laser Interferometer Gravitational-Wave Observatory (LIGO) to directly detect gravitational radiation. Noteworthy examples include Newtonian gravity gradient, seismic, acoustic, thermal and photon shot noise. These are the obstacles that must be confronted by the …
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Gravitational Waves From Perturbed Kerr Black Holes: Two Investigations
… post-Newtonian approximation. We focus on the gravitational energy produced by the quasicircular, equatorial, extreme mass-ratio inspiral of a compact object into a Kerr black hole of mass M and spin J. For a given dimensionless spin a ≡ J/M2 (in geometrical units G = c = 1 ), the energy flux …
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Gravitational waves as an avenue for exploring fundamental physics
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-03-28 without embargo terms
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Gravitational waves and gauge fields in the early Universe
… This thesis explores the role that gravitational wave observations could play in constraining models of the early Universe. We first study the dynamics and signatures of reheating models that lead to the resonant production of Abelian and non-Abelian gauge bosons. We subsequently …
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Gravitational waves from a string cusp in Einstein-aether theory
… Lorentz violation, hopefully observable, in the gravitational waves emitted by cosmic strings. Aspects of cosmic strings are reviewed, in particular how focused bursts of gravitational radiation are emitted when a cusp forms on the string. The same phenomenon is then studied in an effective field …
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Decoding Continuous Gravitational Waves from Pulsars: A Multi-Wavelength Approach
The detection of continuous gravitational wave (CW) signals from isolated neutron stars will provide new insights into the physics of neutron stars and significantly contribute to the field of gravitational wave (GW) astronomy. CW signals are expected, for instance, from young pulsars with …
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Tests of fundamental physics with gravitational waves: Theory and application
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-15 without embargo terms
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Searching for stochastic gravitational waves using co-located interferometric detectors
… co-location, the two LIGO (Laser Interferometer Gravitational Wave Observatory) Hanford interferometers have not been used in the search for the stochastic gravitational wave background due to their coupling to a shared environment, which may be comparable to or exceed any gravitational signal. …
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Gravitational Waves and Inspiraling Compact Binaries in Alternative Theories of Gravity
… of gravity, performed experimental tests, and gravitational waves. The framework and the methods that we use in our calculations are discussed in Part II. This part includes reviewing the methods of the Parametrized Post-Newtonian: PPN) framework, Direct Integration of Relaxed Einstein …
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