Statistics
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986rspta.320..585e&link_type=abstract
(Royal Society Discussion on Material Content of the Universe, London, England, Oct. 23, 24, 1985) Royal Society (London), Philo
Statistics
2
Cosmology, Dark Matter, Relic Radiation, Adiabatic Conditions, Anisotropy, Astronomical Maps, Galactic Clusters, Galactic Evolution, Mathematical Models, Perturbation Theory
Scientific paper
Limits on the anisotropy of the microwave background provide strong constraints on theories of galaxy formation which incorporate nonbaryonic dark matter. Scale-invariant perturbations, which may be in either an adiabatic or an isocurvature mode, are focused on. Adiabatic models with cold dark matter in which galaxies trace the mass distribution lead to excessive small-scale anisotropies unless Omega(0)h(0) exp 4/3 is greater than 0.2. This apparently conflicts with the low value of Omega(0) deduced from dynamical studies of galaxy clustering. This difficulty may be resolved if galaxies are biased tracers of the mass. Isocurvature cold dark-matter models are incompatible with observations even if Omega(0) = 1, unless the amplitude of the galaxy correlation function is more than four times that of the mass distribution. The statistics of the radiation pattern may provide a useful test of the Gaussian nature of the fluctuations.
Bond Richard J.
Efstathiou George
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