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Gravitational pertu...
Gravitational perturbations in plasmas and cosmology
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- Forsberg, Mats, 1978- (author)
- Umeå universitet,Institutionen för fysik
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- Brodin, Gert, Prof. (thesis advisor)
- Umeå universitet,Institutionen för fysik
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- Bradley, Michael, Prof. (thesis advisor)
- Umeå universitet,Institutionen för fysik
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- Clarkson, Christopher, Dr. (opponent)
- Department of Mathematics and Applied Mathematics, University of Cape Town
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(creator_code:org_t)
- ISBN 9789174591255
- Umeå : Institutionen för Fysik, 2010
- English 48 s.
- Related links:
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https://umu.diva-por... (primary) (Raw object)
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Abstract
Subject headings
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- Gravitational perturbations can be in the form of scalars, vectors or tensors. This thesis focuses on the evolution of scalar perturbations in cosmology, and interactions between tensor perturbations, in the form of gravitational waves, and plasma waves. The gravitational waves studied in this thesis are assumed to have small amplitudes and wavelengths much shorter than the background length scale, allowing for the assumption of a flat background metric. Interactions between gravitational waves and plasmas are described by the Einstein-Maxwell-Vlasov, or the Einstein-Maxwell-fluid equations, depending on the level of detail required. Using such models, linear wave excitation of various waves by gravitational waves in astrophysical plasmas are studied, with a focus on resonance effects. Furthermore, the influence of strong magnetic field quantum electrodynamics, leading to detuning of the gravitational wave-electromagnetic wave resonances, is considered. Various nonlinear phenomena, including parametric excitation and wave steepening are also studied in different astrophysical settings. In cosmology the evolution of gravitational perturbations are of interest in processes such as structure formation and generation of large scale magnetic fields. Here, the growth of density perturbations in Kantowski-Sachs cosmologies with positive cosmological constant is studied.
Subject headings
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- general relativity
- cosmology
- gravitational waves
- plasma
- electromagnetic waves
- nonlinear waves
- Plasma physics
- Plasmafysik
- Theory of relativity, gravitation
- Relativitetsteori, gravitation
- Cosmology
- Kosmologi
- teoretisk fysik
- Theoretical Physics
Publication and Content Type
- vet (subject category)
- dok (subject category)
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