1995/10/04 by Robin Tuluie, Pablo Laguna, Peter Anninos · 1 citation
Physics and Astronomy · #astro-ph
paper · pdf · doi:10.1086/177220
published as Astrophys.J.463:15,1996 · 20 pages + 7 figures + 4 plates, self-expanding uuencoded compressed tar archive of postscript files
arxiv created 1995/10/04 · arxiv updated 2009/12/01
We investigate the imprint of nonlinear matter condensations on the Cosmic Microwave Background (CMB) in Ω0<1 cold dark matter (CDM) model universes. We consider simulation domains ranging from 120h-1 Mpc to 360h-1 Mpc in size. We concentrate on the secondary temperature anisotropies induced by time varying gravitational potentials occurring after decoupling. Specifically, we investigate the importance of the Rees-Sciama effect due to: (1) intrinsic changes in the gravitational potential of forming, nonlinear structures, (2) proper motion of nonlinear structures, and (3) late time decay of gravitational potential perturbations in open universes. CMB temperature anisotropies are obtained by numerically evolving matter inhomogeneities and CMB photons from an early, linear epoch (z=100) to the present, nonlinear epoch (z=0). We test the dependence and relative importance of these secondary temperature anisotropies as a function of the scale of the underlying matter (voids, superclusters) and as a function of Ω0. The results of the Ω0<1 models are compared to a similarly executed Ω0=1.0 simulation. We find that in low density models all three sources of anisotropy could be relevant and reach levels of ΔT/T ∼ 10-6. In particular, we find that for Ω0<1 at large scales, secondary temperature anisotropies are dominated by the decaying potential.