Inhomogeneity of cold dark matter due to initial fluctuations in the long cosmic string scheme

Details Inhomogeneity of cold dark matter due to initial fluctuations in the long cosmic string scheme Inhomogeneity of cold dark matter due to initial fluctuations in the long cosmic string scheme

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...438...27h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 438, no. 1, p. 27-39

Astronomy and Astrophysics

Astrophysics

2

Cosmology, Dark Matter, Galactic Evolution, Inhomogeneity, String Theory, Universe, Hubble Constant, Normal Density Functions, Wakes

Scientific paper

It is investigated numerically how the inhomogeneity of dark matter proceeds in the long cosmic string model of galaxy formation. Wakes having sheetlike structures are naturally formed in this model; however, the appropiate fluctuations of dark matter are necessary for the development of inhomogeneity in them, which grows up into astronomical objects such as galaxies. The growth of inhomogeneity dark matter is calculated for two types of initial fluctuations, such as the standard cold dark matter fluctuations and a Gaussian flat spectrum (n=0). If the amplitude of the fluctuations is too large, even the wakes are not formed, and if too small, astronomical objects are not formed within a wake. Typical isodensity surfaces in some representative cases are presented, and we have derived the suitable amplitude range of initial formation in wakes, which is relatively limited.

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