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arxiv: 1403.5922 · v2 · pith:MT6EMSYDnew · submitted 2014-03-24 · 🌌 astro-ph.CO · hep-ph· hep-th

The Knotted Sky II: Does BICEP2 require a nontrivial primordial power spectrum?

classification 🌌 astro-ph.CO hep-phhep-th
keywords spectrumbicep2evidenceprimordialbrokencutoffindexinflationary
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An inflationary gravitational wave background consistent with BICEP2 is difficult to reconcile with a simple power-law spectrum of primordial scalar perturbations. Tensor modes contribute to the temperature anisotropies at multipoles with $l\lesssim 100$, and this effect --- together with a prior on the form of the scalar perturbations --- was the source of previous bounds on the tensor-to-scalar ratio. We compute Bayesian evidence for combined fits to BICEP2 and Planck for three nontrivial primordial spectra: a) a running spectral index, b) a cutoff at fixed wavenumber, and c) a spectrum described by a linear spline with a single internal knot. We find no evidence for a cutoff, weak evidence for a running index, and significant evidence for a "broken" spectrum. Taken at face-value, the BICEP2 results require two new inflationary parameters in order to describe both the broken scale invariance in the perturbation spectrum and the observed tensor-to-scalar ratio. Alternatively, this tension may be resolved by additional data and more detailed analyses.

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  1. Planck 2018 results. X. Constraints on inflation

    astro-ph.CO 2018-07 accept novelty 4.0

    Updated Planck CMB measurements give ns = 0.9649 ± 0.0042, r < 0.056, confirm flatness at 0.4 percent, and show no evidence for scale-dependent features or non-slow-roll dynamics in the inflaton potential.