Astronomy and Astrophysics – Astrophysics
Scientific paper
1994-01-04
Astrophys.J. 426 (1994) L57
Astronomy and Astrophysics
Astrophysics
12 pages of uuencoded PostScript
Scientific paper
10.1086/187339
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. We show that to a great extent, the CMB anisotropies depend only 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 $\Omega$ and is fairly insensitive to the other unknown parameters, such as $\Omega_b$, $h$, $\Lambda$, and the shape of the power spectrum. Therefore, measurements of CMB anisotropies on small scales may be used to determine $\Omega$.
Kamionkowski Marc
Spergel David N.
Sugiyama Naoshi
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