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Revisiting the oscillations in the cosmic microwave background angular power spectra at ℓ ∼ 120 in the Planck 2015 data

Ichiki, Kiyotomo; Horiguchi, Koichiro; Yokoyama, Jun'ichi

While the observed nearly scale-invariant initial power spectrum is regarded as favorable evidence of the standard inflationary cosmology, precision observations of the cosmic microwave background anisotropies also suggest possible existence of nontrivial features such as those observed around multipoles ℓ∼120 by WMAP. Here, we examine the Planck …

Distinguishing between inflationary models from cosmic microwave background

Tsujikawa, Shinji

In this paper, inflationary cosmology is reviewed, paying particular attention to its observational signatures associated with large-scale density perturbations generated from quantum fluctuations. In the most general scalar-tensor theories with second-order equations of motion, we derive the scalar spectral index n_s, the tensor-to-scalar ratio r…