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.
Results
Showing 1 to 19 of 19 for “"binary black holes"”.
-
Advances in Simulating Binary Black Holes
… phenomena in the Universe, the mergers of two black holes. The success of gravitational-wave astronomy is inseparable from the advances in numerical relativity. Nowadays, numerical relativists are able to simulate the spacetimes of binary-black-hole mergers routinely and extract accurate …
-
ANALYZING AND IMPROVING INITIAL DATA FOR BINARY BLACK HOLES
Binary black holes are one of the most likely sources of gravitational radiation to be detected by projects such as LIGO and LISA. This radiation causes the binary to lose energy and angular momentum with the black holes adiabatically spiraling together. The strongest radiation is emitted at …
-
Exploring the Possibility of Floating Orbits for Extreme Mass Ratio Binary Black Holes
<p>A binary black hole system, where each black hole orbits the system's center of mass, loses energy by emission of gravitational waves. This causes both black holes to spiral in towards each other. However, if the binary were to, by some mechanism, gain orbital energy at the same rate that it …
-
Novel aspects of the dynamics of binary black-hole mergers
The inspiral and merger of two black holes is among the most exciting and extreme events in our universe. Being one of the loudest sources of gravitational waves, they provide a unique dynamical probe of strong-field general relativity and a fertile ground for the observation of fundamental …
-
Topics in Gravitational-Wave Astrophysics
… wave searches for comparable mass binary black holes. We determine</p> <p>the domain of applicability of the computationally inexpensive closed form models,</p> <p>and the same for the semi-analytic models that have been calibrated to Numerical</p> <p>Relativity simulations (and are …
-
Gravitational Waves and Inspiraling Compact Binaries in Alternative Theories of Gravity
… non-spinning compact objects: neutron stars or black holes) to 2.5 post-Newtonian order, or $O(v/c)^5$ beyond Newtonian gravity, in a general class of alternative theories to general relativity known as scalar-tensor theories. For the conservative part of the motion, we obtain the two-body …
-
Modeling the Dynamics of Black Hole Systems and the Ringdown of Black Hole Spacetimes
… observing gravitational waves from merging black holes in 2015, theoretical models had already been developed which would greatly contribute to the interpretation of that data. Thanks to numerical relativity, the merger of isolated near-equal mass ratio binary black holes, and the …
-
Bridging the gap between post-Newtonian theory and numerical relativity in gravitational-wave data analysis
… 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 a detailed study of how the most complete waveform …
-
Topics in the Detection of Gravitational Waves from Compact Binary Inspirals
<p>Orbiting compact binaries - such as binary black holes, binary neutron stars and neutron star-black hole binaries - are among the most promising sources of gravitational waves observable by ground-based interferometric detectors. Despite numerous sophisticated engineering techniques, the …
-
The search for unmodeled gravitational-wave transients in the Advanced LIGO-Virgo Era
… observed GW transients from two types of compact-binary sources: binary black holes (e.g., GW150914) and binary neutron stars (e.g., GW170817). Compact-binary sources are well-studied theoretically with well-understood strain waverforms, and thus their detections with Advanced LIGO-Virgo has led …
-
Uncovering gravitational wave signatures of modified theories of gravity and exotic matter
… of being able to model coalescence and merger of binary black holes and neutron stars, and understand how their modelled data fit within the manifold of our GW observations. A key ingredient in source modelling of binary systems is numerical relativity (NR), allowing us to resolve the merger …
-
Characterization of Enhanced Interferometric Gravitational Wave Detectors and Studies of Numeric Simulations for Compact-Binary Coalescences
… promising source of gravitational waves is a binary system consisting of two neutron stars and/or black holes. As the objects orbit each other they emit gravitational radiation, lose energy, and spiral inwards. This produces a characteristic ``chirp'' signal for which we can search in the LIGO …
-
Turbulence and Transport in Stars and Planets
… difficulty stellar modelling has to form massive binary black holes. In the same vein I examined the convection zones of bloated hot Jupiters and discovered a novel feedback mechanism between non-equilibrium tidal dissipation and the thermal structure of their upper envelopes. This mechanism …
-
Motion in a scalar field
… ambient scalar fields influence the motion of binary black holes. Even though the models we consider are subject to no-hair theorems, the interplay between absorption at the horizons and momentum transfer in the bulk of the spacetime still gives rise to interesting phenomenology. We show that …
-
Squeezed light sources for current and future interferometric gravitational-wave detectors
… has begun, with the detection of 5 confirmed binary black holes and a binary neutron star coalescence by the Advanced Laser Interferometer Gravitational- wave Observatory (aLIGO), and later with the advanced Virgo detector. These detections have already revealed a wealth of discoveries across …
-
Squeezed light sources for current and future interferometric gravitational-wave detectors
… has begun, with the detection of 5 confirmed binary black holes and a binary neutron star coalescence by the Advanced Laser Interferometer Gravitational- wave Observatory (aLIGO), and later with the advanced Virgo detector. These detections have already revealed a wealth of discoveries across …
-
Numerical studies of Black Hole initial data
Diese Doktorarbeit behandelt neue Methoden der numerischen Evolution von Systemen mit binären Schwarzen Löchern. Wir analysieren und vergleichen Evolutionen von verschiedenen physikalisch motivierten Anfangsdaten und zeigen Resultate der ersten Evolution von so genannten 'Thin Sandwich' Daten, die …
-
DETECTION AND INFERENCE IN GRAVITATIONAL WAVE ASTRONOMY
… run there were no detections of mergers from binary neutron star and neutron star-black hole binaries. We use Bayesian inference to place upper limits on the rate of coalescence of these binaries. We use developments made in the PyCBC search pipeline during Advanced LIGO and Virgo’s second …
-
Merging neutron star and black hole binaries: Inference of their parameters and simulations of their formation and fate
<p>In recent years, the growing numbers of black hole and neutron star merger candidates observed by the Advanced LIGO (Laser Interferometer Gravitational-Wave Observatory) and Virgo gravitational-wave observatories are rapidly expanding the frontiers of astrophysics. The observations enable (i) …