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

References in corpus (10)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Effective Field Theory for Inflation
• A Model Of Inflationary Cosmology Without Singularity
• Unifying inflation and dark matter with neutrino masses
• Back Reaction of Cosmological Perturbations and the Cosmological Constant Problem
• Probing Noncommutativity with Inflationary Gravitational Waves
• Signatures of trans-Planckian dispersion in inflationary spectra
• Damped Corrections to Inflationary Spectra from a Fluctuating Cutoff
• Trans-Planckian signals from the breaking of local Lorentz invariance
• Effective Field Theory of a Locally Noncommutative Space-Time and Extra Dimensions