C∞ perturbations of FRW models with a cosmological constant

Z. Perjés, M. Vasúth, V. Czinner, D. Eriksson

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)415-421
Number of pages7
JournalAstronomy and Astrophysics
Volume431
Issue number2
DOIs
Publication statusPublished - Feb 2005

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perturbation
background radiation
linear equations
scattering
fluid
flux density
attenuation
microwaves
energy
fluids
temperature
microwave

Keywords

  • Cosmology: cosmic microwave background
  • Cosmology: large scale structure of Universe

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

C∞ perturbations of FRW models with a cosmological constant. / Perjés, Z.; Vasúth, M.; Czinner, V.; Eriksson, D.

In: Astronomy and Astrophysics, Vol. 431, No. 2, 02.2005, p. 415-421.

Research output: Contribution to journalArticle

Perjés, Z. ; Vasúth, M. ; Czinner, V. ; Eriksson, D. / C∞ perturbations of FRW models with a cosmological constant. In: Astronomy and Astrophysics. 2005 ; Vol. 431, No. 2. pp. 415-421.
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