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Density growth in K...
Density growth in Kantowski-Sachs cosmologies with cosmological constant
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- Bradley, Michael (författare)
- Umeå universitet,Institutionen för fysik
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- Dunsby, Peter K S (författare)
- Dept. of Mathematics and Applied Mathematics, University of Cape Town
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- Forsberg, Mats (författare)
- Umeå universitet,Institutionen för fysik
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- Keresztes, Zoltán (författare)
- Dept. of Experimental Physics, University of Szeged
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(creator_code:org_t)
- 2012-04-20
- 2012
- Engelska.
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Ingår i: Classical and quantum gravity. - Bristol : Institute of Physics (IOP). - 0264-9381 .- 1361-6382. ; 29:9, s. 095023-
- Relaterad länk:
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http://iopscience.io...
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http://arxiv.org/pdf...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- fysik
- Physics
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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