Position-Space Description of the Cosmic Microwave Background and Its Temperature Correlation Function

Details Position-Space Description of the Cosmic Microwave Background and Its Temperature Correlation Function Position-Space Description of the Cosmic Microwave Background and Its Temperature Correlation Function

2000-12-07

arxiv.org/abs/astro-ph/0012153v2

Phys.Rev.Lett. 87 (2001) 081301

Astronomy and Astrophysics

Astrophysics

The version accepted for publication in Phys. Rev. Letters. 4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.87.081301

We suggest that the cosmic microwave background (CMB) temperature correlation function C(theta) as a function of angle provides a direct connection between experimental data and the fundamental cosmological quantities. The evolution of inhomogeneities in the prerecombination universe is studied using their Green's functions in position space. We find that a primordial adiabatic point perturbation propagates as a sharp-edged spherical acoustic wave. Density singularities at its wavefronts create a feature in the CMB correlation function distinguished by a dip at theta ~ 1.2 deg. Characteristics of the feature are sensitive to the values of cosmological parameters, in particular to the total and the baryon densities.

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