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 382 for “"Black Hole"”.
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Black Hole
Black Hole is a book-length work of poetry.
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Black Hole
Black Hole is a book-length work of poetry.
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Black Hole Accretion Systems
"Accretion onto a black hole is the most efficient known process to convert gravitational energy into radiation. Some gamma-ray bursts (GRBs), some X-ray binaries, and all active galactic nuclei (AGN) are likely powered by accretion onto a rotating black hole. I model the global, timedependent …
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Rotating black hole spacetimes
… initial data sets represent distorted rotating black holes, and two types of non-rotating black holes with odd-parity radiation distortions. The first has the equatorial plane symmetry of the Kerr spacetime, the second has the equatorial plane symmetry of the ""cosmic screw"" spacetime."
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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 …
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Quantum properties of black hole
… calculate the pressure inside the condensed black hole. It is found that the Bogoliubov dispersion relation for the elementary excitations of the weakly-interacting N-gravitons is shown to hold for the case of the weakly-interacting Graviton gas or N weakly interacting gravitons. where both …
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General Relativistic Black Hole-Neutron Star Simulations: Effects of Black Hole Spin and Binary Mass Ratio
… the cases we simulate and compare them to binary black-hole waveforms. Only a small disk (< 0.01 M⊙ ) forms for the anti-aligned spin case (a/MBH = -0.5) and for the most extreme mass ratio case (q = 5). By contrast, a massive (Mdisk ≈ 0.2 M⊙ ), hot disk forms in the rapidly spinning …
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Numerical relativity in black hole spacetimes
… for the 3 + 1 numerical relativity study of black hole spacetimes. The main result of this thesis is the development of a new technique for avoiding singularities in such spacetimes. In this technique the slices are allowed to penetrate the black hole, but only the region of spacetime outside …
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Nonlinear Waves on Extremal Black Hole Spacetimes
… null condition on extremal Reissner-Nordstrom black hole spacetimes.Under the assumption of spherical symmetry I show that solutions which arise from sufficiently small compactly supported smooth data prescribed on a Cauchy hypersurface \widetilde{\Sigma}_0 crossing the future event horizon …
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Semi-classical aspect of black hole physics
Semi-classical aspects of black hole physics are studied with particular emphasis on Hawking radiation and its derivation from tunnelling method techniques.
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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 …
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Large Gauge Transformations and Black Hole Entropy
… of these large diffeomorphisms in the context of black holes. The emergence of Virasoro algebras as the asymptotic symmetry algebras of black hole spacetimes suggests a fundamental link to conformal field theory. For the case of the generic Kerr black hole, we hypothesize that the black hole is …
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Numerical simulations of neutron star - black hole mergers
Collisions of black holes and neutron stars, named mixed binaries in the following, are interesting because of at least two reasons. Firstly, it is expected that they emit a large amount of energy as gravitational waves, which could be measured by new detectors. The form of those waves is expected …
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Black Hole Astrophysics : Magnetohydrodynamics on the Kerr Geometry
… is dedicated to the astrophysics of rotating black holes. The main topic concerns accretion physics in the regime of General Relativistic Magnetohydrodynamics (GRMHD). The behavior of non-radiative accretion flows and outflows on the Kerr space-time is analyzed. Basic equations of conservative …
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MODELING X-RAY DATA OF BLACK HOLE BINARIES
… data from the 2005 hard state outburst of the black hole SWIFT J1753.5-0127. This system is both fairly bright and has fairly low interstellar absorption, so gives one of the best datasets to study the weak, cool disc emission in this state. We fit these data using models of an X-ray …
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Spinning Black Hole Pairs: Dynamics and Gravitational Waves
Black 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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A Numerical Study of Nonspherical Black Hole Accretion
… ideal gas hydrodynamics around a Kerr black hole. The aim is to study fully dynamic inviscid fluid accretion onto black holes, as well as to study the evolution and development of nonlinear instabilities in pressure supported accretion disks.
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A numerical study of 3D black hole spacetimes
… results from numerical evolutions of vacuum black hole spacetimes in 3D Cartesian coordinates. We first studied the Schwarzschild spacetime, comparing extensively with lD studies. We show that although accurate 3D evolutions are possible, there are a number of difficulties in evolving 3D …
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