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Inflationary paradigm in trouble after Planck2013

Author(s): Ijjas, Anna; Steinhardt, Paul J; Loeb, Abraham

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Abstract: Recent results from the Planck satellite combined with earlier observations from WMAP, ACT, SPT and other experiments eliminate a wide spectrum of more complex inflationary models and favor models with a single scalar field, as reported by the Planck Collaboration. More important, though, is that all the simplest inflaton models are disfavored statistically relative to those with plateau-like potentials. We discuss how a restriction to plateau-like models has three independent serious drawbacks: it exacerbates both the initial conditions problem and the multiverse-unpredictability problem and it creates a new difficulty that we call the inflationary “unlikeliness problem.” Finally, we comment on problems reconciling inflation with a standard model Higgs, as suggested by recent LHC results. In sum, we find that recent experimental data disfavors all the best-motivated inflationary scenarios and introduces new, serious difficulties that cut to the core of the inflationary paradigm. Forthcoming searches for B-modes, non-Gaussianity and new particles should be decisive. (C) 2013 Elsevier B.V. All rights reserved.
Publication Date: 25-Jun-2013
Electronic Publication Date: 14-May-2013
Citation: Ijjas, Anna, Steinhardt, Paul J, Loeb, Abraham. (2013). Inflationary paradigm in trouble after Planck2013. PHYSICS LETTERS B, 723 (261 - 266. doi:10.1016/j.physletb.2013.05.023
DOI: doi:10.1016/j.physletb.2013.05.023
ISSN: 0370-2693
EISSN: 1873-2445
Pages: 261 - 266
Type of Material: Journal Article
Journal/Proceeding Title: PHYSICS LETTERS B
Version: Final published version. This is an open access article.

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