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 16 of 16 for “"Hole spin"”.
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A new twist on black holes: the role of black hole spin in galaxy formation.
We study the coevolution of black holes (BHs) and their host galaxies through cosmic time. The calculation is embedded in the GALFORM semi-analytic model which simulates the formation and evolution of galaxies in a cold dark matter (CDM) universe. The BH and galaxy formation models are coupled: …
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General Relativistic Black Hole-Neutron Star Simulations: Effects of Black Hole Spin and Binary Mass Ratio
… scheme. We explore the effects of BH spin (aligned and anti-aligned with the orbital angular momentum) by evolving three sets of initial data with BH:NS mass ratio q = 3: the data sets are nearly identical, except the BH spin is varied between a/MBH = -0.5 (anti-aligned), 0.0, and …
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Exploring single hole states in InAs/GaAs quantum dots and quantum dot molecules under 2-D electric fields
… that can trap a single electron or hole in a 3-D potential-well. Grown by molecular beam epitaxy (MBE), they have excellent optical qualities that can be used in applications for quantum information processing and quantum computing. Specifically, hole spins in a single QD/QDM have …
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Radiative signatures of the jet launching region in astronomical objects
… are observed in a wide range of accreting black hole systems, from stellar-mass black holes in X-ray binaries (XRBs), to supermassive black holes in active galactic nuclei (AGN). However, despite decades of observational and theoretical research, the mechanism by which relativistic jets are …
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X-ray spectroscopic and timing studies of galactic black hole binaries
… X-ray properties - are classified as black hole binaries. In this thesis, I report on observations of black hole binaries made with satellite observatories in the X-ray band. The region closest to the black hole is revealed in X-rays due to the viscous heating of matter that is accreted from …
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Investigation of efficient spin-photon interfaces for the realisation of quantum networks
… distant nodes. The two ground states of single spins confined in self-assembled InGaAs quantum dots provide an effective two-level system for the implementation of quantum bits. Moreover, they offer strong transition dipole moments with outstanding photonic properties allowing for the …
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From Black Holes to the Big Bang: Astrophysics and Cosmology with Gravitational Waves and their Electromagnetic Counterparts
… has allowed us to study the properties of black holes and neutron stars more precisely than ever before and has opened a new window through which to probe the earliest moments in our universe’s history. Population-level measurements of the masses and spins of compact objects can reveal how these …
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On electromagnetic observables from supermassive black hole accretion flows
… It is likely that the jets are powered by spinning supermassive black holes via a dynamical interaction between magnetic fields close to the hole and the warped spacetime predicted by general relativity. This dissertation describes a series of projects aimed at understanding and identifying …
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Gravitational Waves From Perturbed Kerr Black Holes: Two Investigations
… first project is a study of the effect of black hole spin on the accuracy of the 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 …
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Spectra and variability of accreting black holes
… the structure of matter close to black holes when they are actively accreting. The two components (apart from the black hole itself) most relevant to this work are the accretion disc and X-ray emitting corona. We use various methods to help determine their location, properties and …
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Making better binary models and modeling distorted black holes using black hole perturbation theory
… discuss the application and development of black hole perturbation theory both from an observational standpoint via gravitational waves and also tidal distortions of black hole horizons. The promise of gravitational wave astronomy depends on our ability to accurately model gravitational wave …
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Frequency domain approach to self-force calculations
… 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 scalar charge moving on a fixed geodesic in Kerr spacetime for a …
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Measurements of fast dynamics of hole spins in silicon
… the technology of the 21st century. Single spins trapped in silicon quantum dots (QDs) have become an increasingly promising hardware platform for quantum computing due to their long coherence times, high-fidelity control and industry compatibility for scaling purposes. In particular, the …
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The complex interplay between AGN jet feedback and galaxy evolution
Supermassive black holes (SMBHs), residing in the nuclei of most galaxies, are capable of imparting extreme amounts of energy to their surroundings. Observations indicate the presence of collimated, relativistic jets as well as powerful, multiphase winds emanating from these active galactic nuclei …
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Tight-binding simulations of random alloy and strong spin-orbit effects in InAs/GaBiAs quantum dot molecules
… \ce{InAs} quantum dots (QDs), which have long hole-spin coherence times and are amenable to optical control schemes, have long been explored as building blocks for qubit architectures. One such design consists of vertically stacking two QDs to create a quantum dot molecule (QDM). The two dots …