Large-scale structure in the universe

Astronomy and Astrophysics – Astronomy

Scientific paper

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Adiabatic Conditions, Astronomical Models, Galactic Clusters, Galactic Evolution, Galactic Structure, Gravitational Effects, Computerized Simulation, Correlation, Euler Equations Of Motion, Hubble Constant, Many Body Problem, Neutrinos

Scientific paper

Models containing the essential features of the adiabatic theory of galaxy formation are investigated. A cellular structure of uniform two-dimensional sheets of galaxies, with voids in between, is found to provide a natural explanation for the discrepancy between the observed clustering length (where the two-point correlation function is unity) and the expected scale of large-scale structure in a universe dominated by light neutrinos. An analysis of the growth of surface density perturbations within expanding two-dimensional 'pancakes' is shown to lead to structure on scales up to the scale of galaxy clusters, provided that galaxies are formed by local fragmentation of pancakes, and the pancaking epoch is rather early (zp ⪆ 3). It is also shown that rejection of the neutrino pancake theory on the basis of comparison of the correlation function with existing numerical simulations is premature.

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