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Small-scale cosmic microwave background anisotropies as probe of the geometry of the universeWe perform detailed calculations of cosmic microwave background (CMB) anisotropies in a cold dark matter (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 on the primary Doppler peak depends primarily on Omega and is fairly insensitive to the other unknown parameters, such as Omega(sub b), h, Lambda, 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.
Document ID
19950036380
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Kamionkowski, Marc
(School of Natural Sciences, Inst. for Advanced Study, Princeton, NJ United States)
Spergel, David N.
(Princeton Univ. Observatory, Princeton, NJ, United States)
Sugiyama, Naoshi
(Univ. of California, Berkeley, CA United States)
Date Acquired
August 16, 2013
Publication Date
May 10, 1994
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 426
Issue: 2 pt
ISSN: 0004-637X
Subject Category
Astrophysics
Funding Number(s)
CONTRACT_GRANT: DE-FG02-90ER-40542
CONTRACT_GRANT: NAGW-2448
CONTRACT_GRANT: NSF AST-88-58145
Distribution Limits
Public
Copyright
Other
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