Small-scale cosmic microwave background anisotropies as probe of the geometry of the universe

1994/01/04 by Marc Kamionkowski, David N. Spergel, Naoshi Sugiyama · 6 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #Radio Astronomy Observations and Technology #astro-ph #hep-ph

paper · pdf · doi:10.1086/187339

published as Astrophys.J. 426 (1994) L57 · 12 pages of uuencoded PostScript

arxiv created 1994/01/04 · openalex publication_date 1994/05/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We perform detailed calculations of cosmic microwave background (CMB) anisotropies in a CDM-dominated open universe with primordial adiabatic density perturbations for a variety of reionization histories. The CMB anisotropies depend primarily on the geometry of the universe, which in a matter-dominated universe is determined by OMEGA, and the optical depth to the surface of last scattering. In particular, the location of the primary Doppler peak depends primarily on R and is fairly insensitive to the other unknown parameters, such as OMEGA_b_, h, DELTA, and the shape of the power spectrum. Therefore, if the primordial density perturbations are adiabatic, measurements of CMB anisotropies on small scales may be used to determine OMEGA. Subject Headings: cosmic microwave background - cosmology: theory - intergalactic medium - large-scale structure of universe

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