Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.2807l&link_type=abstract
American Astronomical Society, AAS Meeting #211, #28.07; Bulletin of the American Astronomical Society, Vol. 39, p.779
Astronomy and Astrophysics
Astronomy
Scientific paper
Theoretical differences in the growth of structure offer the possibility that we might distinguish between modified gravity theories of dark energy and ΛCDM. A significant impediment to applying current and prospective large scale galaxy and weak lensing surveys to this problem is that, while the mildly non-linear regime is important, there is a lack of numerical simulations of non-linear growth in modified gravity theories. A major question exists as to whether existing analytical fits, created using simulations of standard gravity, can be confidently applied. In this paper we address this, presenting results of N-body simulations of a variety of models where gravity is altered including the Dvali, Gabadadze and Porrati model. We consider modifications that alter the Poisson equation and also consider the presence of anisotropic shear stress that alters how particles respond to the gravitational potential gradient. We establish how well analytical fits of the matter power spectrum by Peacock and Dodds and Smith et. al. are able to predict the non-linear growth found in the simulations from z= 50 up to today, and also consider implications for the weak lensing convergence power spectrum. We find that the analytical fits provide remarkably good agreement with the simulations, being within 1σ of the simulation results for cases with and without anisotropic stress and for scale dependent and independent modifications of the Poisson equation. No strong preference for either analytical fit is found. This work is supported by the National Science Foundation under grants AST-0607018 and PHY-0555216.
Bean Rachel
Laszlo Istvan
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