| Issue |
A&A
Volume 431, Number 2, February IV 2005
|
|
|---|---|---|
| Page(s) | 415 - 421 | |
| Section | Cosmology (including clusters of galaxies) | |
| DOI | https://doi.org/10.1051/0004-6361:20041472 | |
| Published online | 04 February 2005 | |
C
perturbations of FRW models with a cosmological constant
1
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: daniel.eriksson@physics.umu.se
Received:
15
June
2004
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
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