Density growth in Kantowski-Sachs cosmologies with a cosmological constant

Michael Bradley, Peter K.S. Dunsby, Mats Forsberg, Zoltán Keresztes

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

In this work, the growth of density perturbations in KantowskiSachs 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 analysed both analytically and numerically. 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.

Original languageEnglish
Article number095023
JournalClassical and Quantum Gravity
Volume29
Issue number9
DOIs
Publication statusPublished - May 7 2012

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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