| Article | |
| Report number | arXiv:0912.0462 |
| Title | Modifying Gravity at Low Redshift |
| Author(s) | Brax, Philippe ; van de Bruck, Carsten ; Davis, Anne-Christine ; Shaw, Douglas |
| Publication | 2010 |
| Imprint | 03 Dec 2009 |
| Number of pages | 27 |
| Note | Comments: 32 pages, 8 figures |
| In: | JCAP 04 (2010) 032 |
| DOI | 10.1088/1475-7516/2010/04/032 |
| Subject category | Astrophysics and Astronomy |
| Abstract | We consider the growth of cosmological perturbations in modified gravity models where a scalar field mediates a non-universal Yukawa force between different matter species. The growth of the density contrast is altered for scales below the Compton wave-length of the scalar field. As the universe expands, the Compton wave-length varies in time in such a way that scales which where outside the range of the scalar field force may feel it at a lower redshift. In this case, both the exponent $\gamma$ measuring the growth of Cold Dark Matter perturbations and the shift function representing the ratio of the two Newtonian potentials $\psi$ and $\phi$ may differ from their values in General Relativity at low redshift. |
Corresponding record in: Inspire
Record created 2009-12-03, last modified 2017-05-24
