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Abstract
An Adaptative-Particle-Particle-Particle-Mesh code (HYDRA) plus a ray-tracing procedure was used in [1] to perform an exhaustive analysis of the weak lensing anisotropy. Other nonlinear Cosmic Microwave Background anisotropies, such as the Rees-Sciamaand the Sunyaev-Zel.dovicheffects are also being studied by using the same tools. Here we present some advances in our study of these nonlinear anisotropies. The primary advance is due to the use of better simulations with greater particle densities and appropriate softening, although other parameters have also been adjusted to get better estimates. Thus, we improve on a previous paper [2] where the Rees-Sciamaeffect was studied with Particle-Mesh simulations. We focus particular attention on the resolution improvement and its consequences.
Highlights
For almost a decade, our research team has been working on the computation of Cosmic Microwave Background (CMB) anisotropies using N-body numerical codes
For similar boxes and resolution, the RS and weak lensing (WL) CMB anisotropy estimations with baryons give almost the same results as those obtained without baryons [9]
We have focused our attention on the resolution of our codes for CMB anisotropy estimations
Summary
Our research team has been working on the computation of Cosmic Microwave Background (CMB) anisotropies using N-body numerical codes (in references [1] to [10], the reader may find a detailed description of the work we have done). We first used the sequential AP3M code HYDRA [7] in dark matter only mode and computed RS and WL CMB anisotropies. Afterwards, a Hydra AP3M parallel code was used to do the same estimates with more resolution and greater boxes [1].
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