2013/12/31 by Claudio Llinares, David F. Mota · 1 citation
Physics and Astronomy · #astro-ph.CO #astro-ph.GA #gr-qc
paper · pdf · doi:10.1103/physrevd.89.084023
published as Physical Review D, Volume 89, Issue 8, id.084023 (2014) · 12 pages, 8 figures, matches version accepted for publication in PRD
arxiv created 2014/09/03 · arxiv updated 2014/09/04
In the context of scalar tensor theories for gravity, there is a universally adopted hypothesis when running N-body simulations that time derivatives in the equation of motion for the scalar field are negligible. In this work we propose to test this assumption for one specific scalar-tensor model with a gravity screening mechanism: the symmetron. To this end, we implemented the necessary modifications to include the non-static terms in the N-body code Ramses. We present test cases and results from cosmological simulations. Our main finding when comparing static vs. non-static simulations is that the global power spectrum is only slightly modified when taking into account the inclusion of non-static terms. On the contrary, we find that the calculation of the local power spectrum gives different measurements. Such results imply one must be careful when assuming the quasi-static approximation when investigating the environmental effects of modified gravity and screening mechanisms in structure formation of halos and voids distributions.