Cosmologicalparameter determination with microwave background maps
Abstract
The angular power spectrum of the cosmic microwave background (CMB) contains information on virtually all cosmological parameters of interest, including the geometry of the Universe (Ω), the baryon density, the Hubble constant (h), the cosmological constant (Λ), the number of light neutrinos, the ionization history, and the amplitudes and spectral indices of the primordial scalar and tensor perturbation spectra. We review the imprint of each parameter on the CMB. Assuming only that the primordial perturbations were adiabatic, we use a covariancematrix approach to estimate the precision with which these parameters can be determined by a CMB temperature map as a function of the fraction of sky mapped, the level of pixel noise, and the angular resolution. For example, with no prior information about any of the cosmological parameters, a fullsky CMB map with 0.5° angular resolution and a noise level of 15 μK per pixel can determine Ω, h, and Λ with standard errors of +/0.1 or better, and provide determinations of other parameters which are inaccessible with traditional observations. Smaller beam sizes or prior information on some of the other parameters from other observations improves the sensitivity. The dependence on the underlying cosmological model is discussed.
 Publication:

Physical Review D
 Pub Date:
 July 1996
 DOI:
 10.1103/PhysRevD.54.1332
 arXiv:
 arXiv:astroph/9512139
 Bibcode:
 1996PhRvD..54.1332J
 Keywords:

 98.70.Vc;
 98.80.Bp;
 98.80.Es;
 Background radiations;
 Origin and formation of the Universe;
 Observational cosmology;
 Astrophysics;
 High Energy Physics  Phenomenology
 EPrint:
 Replaced version has minor revisions to match published version