Biased clustering in a universe with hot dark matter and cosmic string

Details Biased clustering in a universe with hot dark matter and cosmic string Biased clustering in a universe with hot dark matter and cosmic string

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990stin...9028473f&link_type=abstract

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Computer Science

Baryons, Cosmology, Dark Matter, Galactic Clusters, Galaxies, Neutrinos, String Theory, Universe, Approximation, Bias, Cores, Decoupling, Halos, Perturbation, Red Shift, Rotation

Scientific paper

The clustering around a cosmic string loop in an universe consisting, at present, of baryons and massive neutrinos was calculated in linear perturbation approximation. Attention was focused mainly on the bias in the clustering. It was shown that the biased clustering of baryons started just after the decoupling time. The clustering will form an object with structure of a core dominated by baryons in the inner region and a halo dominated by massive neutrinos in the outer region. The present length scale of the cores is about several decades Kpc, depending on the rest mass of neutrinos. The rotation curves of such objects are remarkably flat. The amplitudes of the rotation curves decrease with cosmic time. Comparing the observed rotation velocities with calculated results, it is found that galaxies would be formed in the period of redshift z is equal to approximately 3 to 10. The maximum length scale of the bias is about the same as for clusters of galaxies. This result seems to be useful in explaining the correlation between the features of rotation curves of cluster galaxies and the galaxy's distance from the center of the cluster.

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