Long Distance Correlations in the Galaxy Distribution and the Nature of Dark Matter

Details Long Distance Correlations in the Galaxy Distribution and the Nature of Dark Matter Long Distance Correlations in the Galaxy Distribution and the Nature of Dark Matter

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.265..261j&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 265, NO. 2/NOV15, P. 261, 1993

Computer Science

Sound

7

Scientific paper

Specific anomalies in the spatial correlation function ξ(r) and the projected angular correlation function w(θ) of galaxy distributions in cosmological models with baryonic dark matter and isocurvature initial perturbations are discussed. These anomalies are found at r~R and r~2R in ξ(r), where R is the acoustic horizon at the moment of the last scattering of relict radiation. Analogous anomalies occur in w(θ) at the corresponding angles θ_R_ and 2θ_R_ We call these anomalies long distance correlations (LDCs). They are consequences of the secondary sound waves that arise in the ionized plasma from the initial isocurvature perturbations. We investigate the dependence of the properties of the LDCs on the parameters of the models, and emphasize that these properties are very sensitive to the nature of dark matter. The possibility of observing the LDC effect is discussed. We propose a special method for the filtering of this effect in observational data.

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