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 68 for “"Gravitation"”.
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Does Personality Predict Occupational Gravitation?
… the role of personality in occupational gravitation. Two directions of occupational gravitation were proposed and tested— lateral and vertical gravitation. Results revealed that individuals found improved person-occupation personality fit over time as measured by the indices of Openness, …
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Partially Covariant Quantum Theory of Gravitation
… interpretation of any proposed quantum theory of gravitation. After a brief review of the current canonicnl methods for quantizing the gravitational field we conclude that they do not guarantee conservation of probability owing to the difficulty of finding a suitable intrinsic time coordinate. In …
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Quick Evaluation of Small Body Gravitation
… differential equations resulting from the gravitation of nearby celestial small bodies is the subject of this thesis. We present three methods that alleviate the computational burden of evaluating gravitational force near a small body: (i) adaptive polynomial interpolation, (ii) adaptive …
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Gravitation and phase transitions in the early universe
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1982.
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Two quantum effects in the theory of gravitation
… included in calculating the physical effects of gravitation. In the first of these, the consequences of treating general relativity as an effective quantum field theory will be examined. The primary result will be the calculation of the first-order quantum gravity corrections to the [beta] …
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New effective theories of gravitation and their phenomenological consequences
… of differential geometry, base of any gravitational theory. We then establish that the affine structure and the metric of the spacetime are not generally related, and that there is no physical reason to impose a certain affine connection to the gravitational theory. We review the …
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Cosmological perturbation theory and the variational principle in gravitation
… Secondly the variational principle, apropos of gravitation, is formulated and discussed. These two fields are then synthesised via a variational formulation of general relativity and cosmological perturbation theory. In the process new light is shed on Covariant Perturbation Theory via the …
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Fundamental issues in general relativity : inertia, gravitation and electromagnetic mass
… for revealing the nature of inertia and gravitation in terms of both general relativity and the electromagnetic mass theory may have been missed in the first quarter of this century. If the entire mass of an elementary charged particle is regarded as electromagnetic in origin, a …
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Applications of Hodograph Transformation to Hydrodynamic Problems Influenced by Gravitation
The hydrodynamic problems influenced by gravitation have been examined through hodograph transformations. It has been found that even with strong influence of the gravitational field, the stream function can be solved in the hodograph plane through numerical calculations. The velocity function of …
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Study of the general theories of gravitation: Lovelock-Cartan-Horndeski Gravity
We explore generalized gravitational theories that have at most second-order equations of motion in the metric. In this way comes Lovelock’s theory, which is the generalization of General Relativity and describes a gravitational theory in arbitrary dimensions. The next step is to include more …
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Topics in relativistic cosmology: Cosmology on the past lightcone and in modified gravitation
… As a remedy, many alternative theories of gravitation have been proposed over the years, one of which is ƒ(R) gravity. We explore classes of irrotational-fluid cosmological models in the context of ƒ(R) gravity in an attempt to put some theoretical and mathematical restrictions on the form …
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Development of a test of Newton's law of gravitation at micrometer distances using a superconducting spherical torsion balance
Many theories associated with quantum gravity, such as string theory, predict violations of inverse square law (ISL) of gravity at sub millimetre distances. To search for such experimental signatures we developed a magnetically levitated cryogenic torsion balance, the SSTB, and a set of masses with …
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Ondas gravitacionais em teorias de gravitação quadrática
The success of General Relativity in describing gravitational phenomena is unquestionable. Despite this, there are conceptual problems in General Relativity, such as the presence of singularities in solutions to the Einstein equation, energy and dark matter, in addition to the fact that the theory …
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All the Good in the World
… through the lens of deliberate kindness or gravitation towards goodness in a disappointing and dismal world.</p> <p>Doctoral dissertation: <a href="http://aquila.usm.edu/dissertations/121/">http://aquila.usm.edu/dissertations/121/</a></p>
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Candidate mechanosensitive transduction channels in Drosophila melanogaster
Zur Wahrnehmung von Gravitation und Tönen benötigt Drosophila melanogaster das Johnstonsche Organ (JO), welches ein chordotonaler Streckrezeptor ist. Es sitzt im 2ten Antennensegment und besteht aus ca. 500 mechanosensorischen Neuronen. Diese JO-Neuronen wandeln stimulus induzierte …
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The Problem of the Earth's Figure: Measurement, Theory, and Evidence in Physical Geodesy
… the story of a surprisingly difficult problem in gravitational physics: deriving and measuring the shape of our planet. Chapter 1 reconstructs the emergence of gravitational theories of planetary equilibrium figures and quantitative measurements of the Earth’s shape and surface gravity (c. …
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Topics in modified gravity
… of Relativity (GR) is the correct theory of gravitation. It replaced the Newtonian theory of gravity which was presented in the Principia in 1687. The fundamental idea in GR is that gravity is a manifestation of the curvature of the spacetime, while in Newton’s theory gravity acts directly as …
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Exploring gravity
Gravitation is the dominant influence in most astrophysical interactions. Weak-field interactions have been extensively studied, but the strong-field regime remains largely unexplored. Gravitational waves (GWs) are an excellent means of accessing strong-field regions. We investigate what we can …
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Cosmos incognito : Vera Rubin shines light on dark matter
… at a faster speed than Newton's Universal Law of Gravitation allows. As a result of this finding, astronomers conceded that the universe must be filled with more material than they can see. Scientists call this mysterious substance dark matter. This submission explains the scientific history of …
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