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Density Growth in Anisotropic Cosmologies of Bianchi Type I
Umeå University, Faculty of Science and Technology, Department of Physics.
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This work generalises earlier works on the growth of the density perturbations in Bianchi type I cosmologies filled with dust to include also the effects of pressure anda positive cosmological constant. For the analysis the 1+3 covariant split of space-time formalism is used. As the perturbative variables we use scalar quantities thatare zero on the background, and hence are gauge-invariant. These variables form acoupled closed system of first-order evolution equations, that is analysed numericallyand analytically. For short wavelengths an oscillatory behavior is obtained, whereasfor long wavelengths the energy density perturbations grow unboundedly.

Place, publisher, year, edition, pages
2012. , 58 p.
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:umu:diva-58102OAI: diva2:546892
Subject / course
Examensarbete i teknisk fysik
Educational program
Master of Science Programme in Engineering Physics
Physics, Chemistry, Mathematics
Available from: 2012-08-29 Created: 2012-08-25 Last updated: 2012-08-29Bibliographically approved

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