The CDM transfer function and power spectrum The presentday power spectrum of CDM perturbations can be w ritten as where is a normalization constant is the spectral index of primordial perturbati

In the days before fast com puter programs for calculating the transfer function a popu lar approximation to was the BBKS Bardeen Bond Kaiser and Szalay formula ln1 0 171 171 1 0 284 1 18 0 399 0 490 where kk eq and eq 0 073 m0 Mpc a Plot

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