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Density growth in Kantowski-Sachs cosmologies with cosmological constant
Umeå University, Faculty of Science and Technology, Department of Physics.
Dept. of Mathematics and Applied Mathematics, University of Cape Town.
Umeå University, Faculty of Science and Technology, Department of Physics.
Dept. of Experimental Physics, University of Szeged.
2012 (English)In: Classical and quantum gravity, ISSN 0264-9381, E-ISSN 1361-6382, Vol. 29, no 9, 095023- p.Article in journal (Refereed) Published
Abstract [en]

In this work the growth of density perturbations in Kantowski-Sachs cosmologies with a positive cosmological constant is studied, using the 1+3 and 1+1+2 covariant formalisms. For each wave number we obtain a closed system for scalars formed from quantities that are zero on the background and hence are gauge-invariant. The solutions to this system are then analyzed both analytically andnumerically. In particular the effects of anisotropy and the behaviour close to a bounce in the cosmic scale factor are considered.We find that typically the density gradient in the bouncing direction experiences a local maximum at or slightly after the bounce.

Place, publisher, year, edition, pages
Bristol: Institute of Physics (IOP), 2012. Vol. 29, no 9, 095023- p.
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:umu:diva-54575DOI: 10.1088/0264-9381/29/9/095023ISI: 000303105600024OAI: oai:DiVA.org:umu-54575DiVA: diva2:524289
Available from: 2012-04-30 Created: 2012-04-30 Last updated: 2017-12-07Bibliographically approved

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Publisher's full texthttp://iopscience.iop.org/0264-9381/29/9/095023/

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Bradley, MichaelForsberg, Mats

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