Statistics – Computation
Scientific paper
May 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...328...34b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 328, May 1, 1988, p. 34-49. Research supported by the Robert A. Welch Found
Statistics
Computation
33
Cosmology, Galactic Clusters, Galactic Evolution, Neutrinos, Astronomical Models, Computational Astrophysics, Correlation, Spatial Distribution
Scientific paper
The timing problem of the neutrino-dominated cosmological scenario, i.e., the inferred young age for the large-scale structure versus the observationally indicated older age of galaxies and quasars, is considered. It can be resolved by 'antibiasing' of galaxy formation. By applying a variety of alternative prescriptions for galaxy formation to N-body simulations of the neutrino scenario, it is found that the clustering of galaxies could be suppressed relative to the neutrinos to an extent that eliminates the timing problem. It requires that galaxies form preferentially in the flat 'sheets' relative to the denser 'filaments' and compact clusters. This could emerge either from differences in the efficiency of galaxy formation itself or from feedback influence from a first generation of objects (e.g., quasars) which suppresses the formation of incipient galaxies locally. Various illustrative examples are presented in order to quantify the requirements from such antibiasing mechanisms, and their physical plausibility is discussed. Other aspects of the neutrino cosmology are discussed in view of the proposed antibiasing, concluding that no fatal flaw is seen in this picture.
Braun Erez
Dekel Avishai
Shapiro Paul R.
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