Short Distance Physics and Initial State Effects on the CMB Power Spectrum

Abstract

We investigate a modification in the action of inflaton due to noncommutativity leads to a nonstandard initial vacuum and oscillatory corrections in the initial power spectrum. We show that the presence of these oscillations causes a drop in the WMAP ${\chi }^2$ about $\Delta {\chi }^2\sim 8.5$. As a bonus, from the parameter estimation done in this work, we show that the noncommutative parameters can be precisely bound to $10^{16}$ GeV or $10^4$ GeV depending on the inflation scale.

29 pages, 5 figures, v2

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• Oscillations in the inflaton potential: Complete numerical treatment and comparison with the recent and forthcoming CMB datasets
• On the scalar consistency relation away from slow roll
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• Numerical evaluation of the three-point scalar-tensor cross-correlations and the tensor bi-spectrum
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• The scalar-scalar-tensor inflationary three-point function in the axion monodromy model