CMB Anisotropy Computations Using Hydra Gas Code

From FFP6 to FFP11, we presented the advances in our Cosmic Microwave Background (CMB) anisotropy computations using N-body Hydra Codes. For such computations, codes without baryons were used: First sequential versions and afterwards parallel ones. With both of them we computed the weak lensing and the Rees-Sciama contributions to the CMB angular power spectrum. Using our numerical techniques, we reported a lensing effect higher than that estimated in previous papers (for very small angular scales). Our CMB computations require less interpolations and approximations than other approaches. This could explain part of our excess of power in lensing computations. Our higher time and angular resolutions could also contribute to this excess. Here, recent advances on previous computations are presented. Computations with baryons have been started. These calculations allow us to compute the Sunyaev-Zel’dovich contribution to the CMB angular power spectrum. We are also trying to compute the three effects—weak lensing, Rees-Sciama and Sunyaev-Zel’dovich—at the same time, with the essential aim of seeing how their power spectra couple among them.