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 34 for “"inspiral"”.
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Investigating the influence of spin-curvature coupling on extreme mass-ratio inspirals
In this report, extreme mass ratio inspiral worldlines and gravitational waveforms were produced considering radiation reaction and spin-curvature effects. Spin-curvature coupling was predicted to modify the inspiral by introducing oscillations to the small body's worldline. Investigating these …
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Using perturbation theory to understand the two body problem in general relativity
… energy from such extreme mass ratio inspirals (EMRIs) forces the separation between the two components to shrink, leading to their merger. We treat the smaller object as a point-like particle on the stationary space-time of the larger black hole. The EMRI problem can be broken down …
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Merging black hole binaries in gaseous environments: simulations in general-relativistic magnetohydrodynamics
… by a Γ-law equation of state. During the binary inspiral, we find evidence for significant enhancements in both the accretion rate and luminosity over values for a single black hole of the same mass as the binary. We also consider disk-like accretion flows with significant gas angular momentum. …
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Effects of resonances and spin-curvature coupling in extreme mass ratio inspirals
… by a stellar mass Kerr black hole as it inspirals into a much more massive black hole (SMBH). To compute this waveform, we must first compute the inspiral trajectory of the stellar mass black hole. The trajectory of the smaller black hole differs from the geodesic structure taught in GR …
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Dense stellar systems and massive black holes
… stars and stellar-mass black holes can gradually inspiral into the SMBH due to the emission of gravitational radiation, which is known as an “Extreme Mass Ratio Inspiral” (EMRI), and (b) stars can produce gases which will be accreted by the SMBH through normal stellar evolution, or by collisions …
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Frequency domain approach to self-force calculations
… gravitational waves from extreme mass ratio inspiral systems, we consider the motion of the particle in black hole spacetimes. As a toy model for the most astrophysically relevant scenario of orbits about a rotating black hole we first study the scalar-field self-force (SSF)experienced by a …
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Bridging the gap between post-Newtonian theory and numerical relativity in gravitational-wave data analysis
… source of measurable gravitational waves is the inspiral and merger of two compact objects, such as binary black holes. Successfully finding their signature in the noise-dominated data of the detectors crucially relies on accurate predictions of what we are looking for. In this thesis, we present …
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Exploring gravity
… included in the prescription for generating EMR inspiral waveforms. Their effects can be estimated from asymptotic expansions of the evolving orbital parameters. The quantitative impact on parameter estimation has yet to be calculated, but it appears that it shall be necessary to incorporate …
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General relativistic magnetohydrodynamic simulations of binary neutron star mergers
… fields of two neutron stars aligned with the inspiral axis, one aligned and one anti-aligned, and both anti-aligned) to investigate the effect of these parameters on the dynamics of the simulations and possibility of forming relativistic jets, which is thought to be one of the necessary …
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Making better binary models and modeling distorted black holes using black hole perturbation theory
… three phases of binary black hole coalescence - inspiral, plunge/merger, and ring down - by combining information from a variety of modeling techniques. In this thesis, we combine EOB with black hole perturbation theory to study the transition from inspiral to plunge-merger and ringdown. This …
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Gyroscropes Orbiting Gargantuan Black Holes: Spinning Secondaries in Extreme Mass Ratio Inspirals
… of gravitational-wave emission driving inspiral. Another post-geodesic effect, the spin-curvature force, is due to the smaller body's spin coupling to spacetime curvature. Exploiting the large mass-ratio approximation, this thesis presents a suite of mathematical and computational tools …
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Computation Methods for Parametric Analysis of Gravitational Wave Data
… waves by computation of ppE for the inspiral phase using ChirpLab. A set of templates will be generated with ppE parameters that can be used for the testing.
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Spinning Black Hole Pairs: Dynamics and Gravitational Waves
… a further significance as the separatrix between inspiral and plunge for eccentric orbits. We then show that there exists a discrete set of orbits that are geometrically closed n-leaf clovers in a precessing orbital plane. When viewed in the full three dimensions, these orbits do not close, but …
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Eccentricity of Merging Neutron Star Binaries: Searches, Parameter Estimation, and Future Prospects
… from the binary's orbit as the star's inspiral together. This thesis describes a search for neutron star binaries that have an eccentric orbits when their gravitational waves enter the sensitive band of Advanced LIGO and Virgo. For the detected binary neutron star mergers GW170817 and …
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Black Holes, Galaxy Clusters and Gravitational Waves
… 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 functions. We also devise a method to …
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Gravitational waves as direct probes of binary evolution and astrophysical environments
… such that gravitational waves then drive inspiral towards merger. Compact binary formation thus requires various astrophysical mechanisms/channels that can extract enough orbital energy and angular momentum, many of which are wrought with uncertainty. The main theme of this dissertation is …
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Studies of materials for use in future interferometric gravitational wave detectors
… yet to be detected directly, measurements of the inspiral rate of a binary pulsar system have provided strong evidence for their existence and a world-wide effort to develop more sensitive detectors is ongoing. In addition to testing predictions of General Relativity, observation and analysis of …
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General Relativistic Black Hole-Neutron Star Simulations: Effects of Black Hole Spin and Binary Mass Ratio
… these binaries for 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 …
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From Measure Zero to Measure Hero: Periodic Kerr Orbits and Gravitational Wave Physics
… approach models such an extreme mass ratio inspirals (EMRI) as an adiabatic progression through a series of Kerr geodesics. Thus, the direct detection of gravitational radiation from EMRIs and the extraction of astrophysical information from those waveforms require a thorough knowledge of …
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Modeling Compact Objects with Effective Field Theory
… waveform emitted by the binary during its late inspiral and compare it to a waveform from standard methodologies. Then, by performing illustrative numerical experiments of systems that the LIGO-Virgo observatories have already detected, we show the role of the stellar structure and their …
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