Kamaretsos, Ioannis
2012.
Gravitationalwave radiation from merging binary
black holes and Supernovae.
PhD Thesis,
Cardiff University.
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Abstract
This thesis is conceptually divided into two parts. The first and main part concerns the generation of gravitational radiation that is emitted from merging blackhole binary systems using Numerical Relativity methods. The second part presents the methodology of the search for gravitationalwave bursts that are emitted in corecollapse Supernovae. My approach to Numerical Relativity is to utilise the latetime gravitational radiation of merging binary black holes to extract key astrophysical parameters from such systems via standard parameter estimation techniques. I begin with an introductory chapter that outlines the standard theories of stationary and perturbed black holes. In addition, uptodate techniques in performing binary black hole simulations, the current and nearfuture status of the global network of gravitationalwave detectors, as well as the most promising gravitationalwave sources. I conclude the chapter with elements on parameter estimation techniques, such as Bayesian analysis and the Fisher information matrix. In Chapter 2, I discuss detection issues and parameter estimation results from the latetime radiation of colliding nonspinning black holes in quasicircular orbits, and propose a practical test of General Relativity, as well as of the nature of the merged compact object. Chapter 3 involves similar parameter extraction calculations, but involves a more realistic approach, whereby the effect of the various angular parameters on parameter estimation is considered, placing an emphasis on the actual science benefit from measuring the gravitational radiation from perturbed intermediate and supermassive black holes. In Chapter 4 we present the results of an extensive Numerical Relativity study of merging spinning black hole binaries and argue that the mass ratio and individual spins of a nonprecessing progenitor binary can be measured solely by observing the latetime radiation. Chapter 5 presents the methodology in carrying out searches for gravitationalwave bursts (GWB) from corecollapse Supernovae with a dedicated for GWB searches pipeline (XPipeline) and presents the sensitivity performance of XPipeline in detecting GWBs associated with certain Supernova candidates during the two most recent LIGOVirgoGEO Science Runs.
Item Type:  Thesis (PhD) 

Status:  Unpublished 
Schools:  Physics and Astronomy 
Subjects:  Q Science > QB Astronomy 
Uncontrolled Keywords:  binary black holes, gravitational waves, gravitationalwave radiation, colliding black holes, black hole merger, core collapse supernova, numerical simulations, numerical relativity, parameter estimation, gravitational wave searches, ringdown, multimode decomposition, binary progenitor, gravitational wave interferometers, full population study, signal detection, gravitationalwave burst, BAM, XPipeline, LigoVirgo Collaboration, Ligo Scientific Collaboration, LISA, Laser Interferometer Space Antenna, European LISA, NGO, Next Gravitationalwave Observatory, Einstein Telescope, Advanced Ligo 
Date of First Compliant Deposit:  30 March 2016 
Last Modified:  19 Mar 2016 23:17 
URI:  http://orca.cardiff.ac.uk/id/eprint/46220 
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