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As a test of the standard inflationary cosmology, which generically predicts a nearly scale-invariant spectrum of primordial curvature fluctuations, we perform a Markov-Chain Monte-Carlo analysis to search for possible modulations in the power spectrum and determine its shape together with the cosmological parameters using cosmic microwave background radiation data. By incorporating various three-parameter features on the simple power-law spectrum, we find an oscillatory modulation localized around the comoving wave number k0. 009 Mpc^-1 at 99. 995% confidence level which improves the log-likelihood as much as -2lnL₄₅₅^2=-22. This feature can be detected even if we use only the cross correlation between the temperature and the E-mode polarization anisotropies.
Ichiki et al. (Thu,) studied this question.