Dark Matter in a One-dimensional Universe

Details Dark Matter in a One-dimensional Universe Dark Matter in a One-dimensional Universe

2005-01-15

arxiv.org/abs/astro-ph/0501318v1

Nuovo Cim. B118 (2003) 1149-1153

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures

Scientific paper

10.1393/ncb/i2004-10037-6

A computer code to simulate temporal evolution of overdensities in a one-dimensional Universe is presented for didactic purposes. The formation of large scale structures in this one-dimensional universe can be studied both in matter or radiation dominated eras. Since large scale structures are already observed at z > 7, primordial dark matter overdensities delta_DM which are 90 times larger than the observed barionic delta_B in the cosmic microwave background are required at z~1000. This makes possible non-linear gravitational collapse at redshift z >7 and the formation of the structures. Primordial perturbations delta_B~10^-5 do not leave the linear regime of growth without the aid of dark matter's potential wells. This code is suitable for commercial worksheets like MSExcel, StarOffice, or OpenOffice.

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