Volume 431, Number 2, February IV 2005
|Page(s)||415 - 421|
|Section||Cosmology (including clusters of galaxies)|
|Published online||04 February 2005|
C perturbations of FRW models with a cosmological constant
KFKI Research Institute for Particle and Nuclear Physics, Budapest 114, PO Box 49, 1525, Hungary e-mail: [vasuth;czinner]@rmki.kfki.hu
2 Department of Physics, Umeå University, 90187 Umeå, Sweden e-mail: firstname.lastname@example.org
Accepted: 8 October 2004
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 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.
Key words: cosmology: cosmic microwave background / cosmology: large scale structure of Universe
© ESO, 2005
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.