Density perturbations in Kantowski-Sachs models with a cosmological constant
2011 (English)In: J. Phys.: Conf. Ser. 314 012026: Spanish Relativity Meeting (ERE 2010): Gravity as a Crossroad in Physics / [ed] Víctor Aldaya, Carlos Barceló and José Luis Jaramillo, IOPscience , 2011Conference paper (Refereed)
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 a closed system for eight scalars is obtained. These are formed from quantities that are zero on the background and hence are gauge invariant. As an example a numerical solution describing the evolution of density perturbations on a background that experiences a bounce is presented. Typically the density gradient in the bouncing directions experiences a local maxium at or slightly after the bounce.
Place, publisher, year, edition, pages
IOPscience , 2011.
IdentifiersURN: urn:nbn:se:umu:diva-47616DOI: 10.1088/1742-6596/314/1/012026OAI: oai:DiVA.org:umu-47616DiVA: diva2:443522
Spanish Relativity Meeting (ERE 2010): Gravity as a Crossroad in Physics