The results are used to compute both the CMB anisotropy and the linear power spectrum of matter fluctuations. A high degree of accuracy is sought in the treatment of the relevant physics and the numerical integrations. The overhead from communication is insignificant, since the computation necessary to evolve a given k mode to the present is much larger than that required for the initial and final message passing.
Blue regions are cooler, and red regions hotter.
The photon brightness temperature perturbation . The maxima and minima of the Doppler peaks correspond to compression and rarefaction at the time of recombination. A typical run took 20 hours on 64 nodes of the IBM SP2. Up to 10,000 moments l and 5000 points in k were computed. We believe this is the most accurate treatment to date of both the physics and the numerical integration.