C-infinity perturbations of FRW models with a cosmological constant
2005 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, Vol. 431, no 2, 415-421 p.Article in journal (Refereed) Published
Spatially homogeneous and isotropic cosmological models, with a perfect fluid matter source and non-vanishing cosmological constant, are studied. The equations governing linear perturbations of the space-time and the variation of energy density are given. The complete solution of the problem is obtained for C∞ perturbations, using a comoving time. The Sachs-Wolfe fluctuations of the temperature of the cosmic background radiation are obtained for the relatively growing density perturbations. It is found that the observable celestial microwave fluctuation pattern underwent a reversal approximately two billion years ago. What is observed today is a negative image of the last scattering surface with an attenuation of the fluctuations, due to the presence of the cosmological constant.
Place, publisher, year, edition, pages
2005. Vol. 431, no 2, 415-421 p.
cosmology: cosmic microwave background, cosmology: large scale structure of Universe
IdentifiersURN: urn:nbn:se:umu:diva-2890DOI: 10.1051/0004-6361:20041472OAI: oai:DiVA.org:umu-2890DiVA: diva2:141216