Hydrodynamical Instabilities & the Trace of Dark Energy within the CMB - Junk, Veronika
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The first part of this work addresses the importance of shear flows in astrophysical gas dynamics, where the evolution of the Kelvin-Helmholtz instability (KHI) is studied analytically and numerically. The dispersion relation for the two-dimensional KHI including viscous dissipation is derived. The resulting expression for the growth rate is then used to estimate the intrinsic viscosity of four numerical schemes depending on code-specific as well as on physical parameters. The second part of this work focuses on the importance of forthcoming CMB measurements and their corresponding…mehr

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Produktbeschreibung
The first part of this work addresses the importance of shear flows in astrophysical gas dynamics, where the evolution of the Kelvin-Helmholtz instability (KHI) is studied analytically and numerically. The dispersion relation for the two-dimensional KHI including viscous dissipation is derived. The resulting expression for the growth rate is then used to estimate the intrinsic viscosity of four numerical schemes depending on code-specific as well as on physical parameters. The second part of this work focuses on the importance of forthcoming CMB measurements and their corresponding implications for cosmology. The theoretical CMB-cross correlation bispectrum (between the Rees-Sciama and weak lensing effect) together with the corresponding signal-to-noise ratio are analyzed for dark energy models with a time varying equation of state - the quintessence. The main focus is on a special form of quintessence, called early dark energy. The theoretical predicted signals give insight if future experiments are able to distinguish between quintessence and the standard cosmological constant.
Autorenporträt
Study of physics in munich with subsequent dissertation in astrophysics about hydrodynamical instabilities and the influence of dark energy within the cosmic microwave background.