EDP Sciences
Free access
Volume 423, Number 3, September I 2004
Page(s) 811 - 819
Section Cosmology (including clusters of galaxies)
DOI http://dx.doi.org/10.1051/0004-6361:20041104

A&A 423, 811-819 (2004)
DOI: 10.1051/0004-6361:20041104

The Integrated Sachs-Wolfe effect as a probe of non-standard cosmological evolution

T. Multamäki 1 and Ø. Elgarøy 2, 1

1  NORDITA, Blegdamsvej 17, 2100, Copenhagen, Denmark
    e-mail: tuomas@nordita.dk
2  Institute of theoretical astrophysics, University of Oslo, PO Box 1029, 0315 Oslo, Norway

(Received 16 April 2004 / Accepted 19 May 2004)

The Integrated Sachs-Wolfe effect is studied in non-standard cosmologies. By considering flat universes, it is shown how the quadrupole power can in principle be effectively suppressed by atypical evolution of the scale factor at a high redshift. However, an efficient suppression requires models that are very difficult to realize. The effect on the overall normalization of the CMB power spectrum is also discussed as non-standard cosmologies can affect the overall normalization significantly and enhance the primordial fluctuations. The possibility of constraining such non-standard models with CMB and independent measures of  $\sigma_8$, is discussed.

Key words: cosmology: theory -- cosmology: cosmic microwave background -- cosmology: large-scale structure of Universe

© ESO 2004