Dark Matter in a One-dimensional Universe
Abstract
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.
Cite
@article{arxiv.astro-ph/0501318,
title = {Dark Matter in a One-dimensional Universe},
author = {Costantino Sigismondi},
journal= {arXiv preprint arXiv:astro-ph/0501318},
year = {2009}
}
Comments
4 pages, 3 figures