Rees-Sciama Effect in a CDM Universe
نویسنده
چکیده
The Rees-Sciama (RS) effect produces fluctuations in the cosmic microwave background (CMB) through the time-dependent gravitational potential in the nonlinear stages of evolution. I investigate the RS effect on the CMB angular power spectrum Cl for several CDM models by combining the results of N-body simulations with second order perturbation theory. The amplitude of the RS fluctuations peaks at l ∼ 100− 300, where it gives ∆T/T ∼ 10 − 10 for a wide range of models. This is at least an order of magnitude below the COBE normalized primary contribution. RS fluctuations could be a dominant source of anisotropies only on subarcminute scales (l ≈ 5000) and are below the present day observational sensitivities on all angular scales. Subject headings: cosmic microwave background—cosmology: large scale structure
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