Matching WMAP 3-year results with the cosmological Slingshot primordial spectrum |
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Authors: | Cristiano Germani and Michele Liguori |
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Institution: | (1) SISSA and INFN, via Beirut 4, 34014 Trieste, Italy;(2) D.A.M.T.P., Centre for Mathematical Sciences, University of Cambridge, Wilberforce Road, Cambridge, CB3 0WA, England |
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Abstract: | We consider a recently proposed scenario for the generation of primordial cosmological perturbations, the so called Cosmological
Slingshot scenario. We first obtain a general expression for the Slingshot primordial power spectrum which extends previous
results by including a blue pre-bounce residual contribution at large scales. Starting from this expression we numerically
compute the CMB temperature and polarization power spectra arising from the Slingshot scenario and show that they excellently
match the standard WMAP 3-year best-fit results. In particular, if the residual blue spectrum is far above the largest WMAP
observed scale, the Slingshot primordial spectrum fits the data well by only fixing its amplitude and spectral index at the
pivot scale k
p = 10−3
h Mpc−1. We finally show that all possible distinctive Slingshot signatures in the CMB power spectra are confined to very low multipoles
and thus very hard to detect due to large cosmic variance dominated error bars at these scales. |
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Keywords: | String cosmology CMP |
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