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 20 of 33 for “"relativistic effects"”.
-
Towards Efficient and Scalable Electronic Structure Methods for the Treatment of Relativistic Effects and Molecular Response
… structure methods for the treatment of relativistic effects and molecular response. As such, the first chapter outlines the theoretical underpinnings from which the rest of the original work is built upon. The second chapter outlines, several contributions to the field of relativistic …
-
Lorentz contraction effects in the electromagnetic form factors of relativistic two-body bound systems
Relativistic effects in the electromagnetic form factors of a two-body bound system are discussed by examining specific examples in detail. The wave function for the two-body bound system is calculated from the Bethe-Salpeter equation and inserted into form factor expressions for scalar and vector …
-
Atomistic Simulations of Antiferromagnetic Solitons and their High-Speed Dynamics
… dynamics, in which solitons begin to display relativistic effects, have been well understood for the case of singledimensional particles - domain walls. Here. we perform an extensive and systematic atomistic study of both 1D and 2D soliton dynamics in chiral magnetic materials, both at and …
-
Global Positioning System in Curved Space-Time and Other Applications of General Relativity
… First, we show a numerical scheme to account for relativistic effects in the Global Positioning System. Then, a couple of applications of astrophysical interest are worked out. These are the study of the gravitational collapse of stars and the dynamical evolution of a three-dimensional …
-
Relativistic Hamiltonians and short range structure of nuclei
… structure of deuteron is studied using a nonrelativistic Hamiltonian. The equidensity surfaces for spin projection Ms=O distributions are found to be toroidal in shape, while those of Ms=±1 have dumbbell shapes at large density. The toroidal shapes indicate that the tensor correlations have …
-
Relativistic Hamiltonians and Short-Range Structure of Nuclei
… structure of deuteron is studied using a nonrelativistic Hamiltonian. The equidensity surfaces for spin projection $M\sb{s}$ = 0 distributions are found to be toroidal in shape, while those of $M\sb{s}$ = $\pm$1 have dumbbell shapes at large density. The toroidal shapes indicate that the …
-
Introduction of a Fully Relativistic Capable Basis Set in the ab initio Orthogonalized Linear Combination of Atomic Orbitals Method
Large simulation cell sizes, relativistic effects, and the need to correctly model excited state properties are major impediments to the accurate prediction of the optical properties of candidate materials for solid-state laser crystal and luminescent applications. To overcome these challenges, new …
-
Effects of Spin on Neutron-Star Observations
… taking into account the special and general relativistic effects arising from the strong gravity and fast spin of these sources are necessary. Moreover, for some observables the effects of the rapid spin can dominate the measurement. In this thesis, I develop a ray-tracing algorithm using the …
-
Modelling of Berry phase and Fermi-level topologies for emergent quantum phenomena prediction in selected solid state systems
… Spin-orbit coupling (SOC) is included to capture relativistic effects critical for topological properties. We generate maximally localized Wannier functions (MLWFs) with Wannier90 and construct tight-binding (TB) models to compute Berry curvature, surface state spectra, and Fermi arc patterns via …
-
An Exploration of Theoretical Spectra
… methods and an emphasis on the importance of relativistic effects. Throughout this work the X2C Hamiltonian is utilized to produce the reference wavefunction, including both scalar relativistic effects and spin-orbit coupling variationally in the presented schemes. First, a relativistic …
-
Cosmic string cusps and their application to fast radio bursts
… aspects of cosmic strings. The first is relativistic modification of cusps. Nambu-Goto strings generically develop cusps, regions of the string which emit coherent electromagnetic radiation when they decay. We point out that consideration of relativistic effects in the rest frame of the …
-
Relativistic theory of low energy electron diffraction
… the role of spin polarization and further relativistic effects in the diffraction of low energy electrons (LEED) by crystals composed of heavy atoms, a relativistic dynamical theory is developed for calculating LEED intensities and spin polarizations. The presentation of the general …
-
Gravitational influences on magnetic field structure in accretion disks
… within the disk. We discuss the general relativistic effects near the event horizon using the Pseudo- Newtonian potential in this limit. In addition, we consider an alternate derivation of the equation of motion describing the behavior of the magnetic field and discuss its consequences.
-
A Dirac all-electron basis and spin-orbit coupled projector implementation of the Projector Augmented Wave Method for atomic systems
… for which exact calculations are impractical. Relativistic and spin-orbit effects are significant for valence electrons of magnetic and semimetal fourth-row, and of all fifth- and sixth-row elements of the periodic table. Prior to any molecular or solid calculation with the PAW method, one must …
-
Crystallography of Pharmaceuticals: Ways to improve efficiency and assessing the fragment-based approach for enhanced polymorph discrimination
… and how this approach allows us to include relativistic effects at the spin-orbit level of theory, which we hope can enhance our ability to distinguish between different polymorphs of a chemical. In this portion of the thesis, we studied three organics: sulfanilamide, theophylline, and …
-
X-ray spectroscopic and timing studies of galactic black hole binaries
… of these systems may therefore reveal General Relativistic effects. A fundamental and testable prediction of General Relativity is that matter may orbit more closely around black holes with significant angular momentum. I have investigated the possibility of black hole "spin" and the geometry …
-
Extension and applications of the GVVPT2 method to the study of transition metals
… or inflexion points. In order to account for relativistic effects, which become important in heavy elements, the GVVPT2 method was extended to include scalar relativistic effects through the spin-free exact two component (sf-X2C) method and used in the studies of all molecules of second row …
-
Star Clusters and Dark Matter as Probes of the Spacetime Geometry of Massive Black Holes
… about 6 light-hours) of the black hole, the relativistic precessions dominate, leaving a potential window for tests of no-hair theorems. Our results are in agreement with N-body simulation results.</p><p>In the second part, we develop a fully general relativistic phase-space formulation to …
-
Systems Performance Analysis for Autonomous Spacecraft Navigation within Satellite Constellations using Intersatellite Optical Communications Links
… are related to the hardware design. We analyze relativistic effects when modeling the intersatellite light propagation. We expand on previous constellation analyses, in particular navigation via OISLs within LEO mega-constellations like Starlink, Earth navigation constellations like the Global …
-
Study of the quasielastic ³He(e,e'p) reaction at Q² = 1.5 (GeV/c)² up to missing momenta of 1 GeV/c
… 100 to 740 MeV/c, strong final state interaction effects, in general consistent with Glauber-type and diagrammatic calculations, are observed. On a finer detail, meson exchange currents, isobaric currents and dynamical relativistic effects might be isolated with further theoretical work, in view …
Page 1 of 2