CMB radiation power spectrum in CDM open universes up to 2nd order perturbations

Details CMB radiation power spectrum in CDM open universes up to 2nd order perturbations CMB radiation power spectrum in CDM open universes up to 2nd order perturbations

1996-02-28

arxiv.org/abs/astro-ph/9602148v1

Astronomy and Astrophysics

Astrophysics

plain tex, 8 pages, 4 figures

Scientific paper

A second--order perturbation theory approach is developed to calculate temperature anisotropies in the cosmic microwave background. Results are given for open universes and fluctuations corresponding to CDM models with either Harrison-Zeldovich (HZ) or Lyth-Stewart-Ratra-Peebles (LSRP) primordial energy--density fluctuation power spectrum. Our perturbation theory approach provides a distinctive multipole contribution as compared to the primary one, the amplitude of the effect being very dependent on normalization. For low--$\Omega$ models, the contribution of the secondary multipoles to the radiation power spectrum is negligible both for standard recombination and reionized scenarios, with the 2--year COBE--DMR normalization. For a flat universe this contribution is $\approx 0.1-10\%$ depending on the reionization history of the universe and on the normalization of the power spectrum.

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