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- W1979405665 abstract "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 $llesssim 100$, 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." @default.
- W1979405665 created "2016-06-24" @default.
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- W1979405665 date "2014-08-26" @default.
- W1979405665 modified "2023-10-16" @default.
- W1979405665 title "The Knotted Sky II: does BICEP2 require a nontrivial primordial power spectrum?" @default.
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- W1979405665 doi "https://doi.org/10.1088/1475-7516/2014/08/053" @default.
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