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We consider a recently proposed scenario for the generation of primordialcosmological perturbations, the so called Cosmological Slingshot scenario. Wefirstly obtain a general expression for the Slingshot primordial power spectrumwhich extends previous results by including a blue pre-bounce residualcontribution at large scales. Starting from this expression we numericallycompute the CMB temperature and polarization power spectra arising from theSlingshot scenario and show that they excellently match the standard WMAP3-years best-fit results. In particular, if the residual blue spectrum is farabove the largest WMAP observed scale, the Slingshot primordial spectrum fitsthe data well by only fixing its amplitude and spectral index at the pivotscale k_p=10^{-3}h x Mpc^{-1}. We finally show that all possible distinctiveSlingshot signatures in the CMB power spectra are confined to very lowmultipoles and thus very hard to detect due to large cosmic variance dominatederror bars at these scales.

Matching WMAP 3-yrs results with the Cosmological Slingshot Primordial Spectrum