AffiliationUniversity of Arizona, Department of Physics, Applied Math Program
University of Arizona, Department of Astronomy
MetadataShow full item record
PublisherSPRINGER BERLIN HEIDELBERG
CitationMelia, F. Eur. Phys. J. C (2019) 79: 455. https://doi.org/10.1140/epjc/s10052-019-6963-5
JournalEUROPEAN PHYSICAL JOURNAL C
Rights© The Author(s) 2019; Open Access: this article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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AbstractThe recently measured cutoff, kmin=4.34±0.50/rcmb (with rcmb the comoving distance to the last scattering surface), in the fluctuation spectrum of the cosmic microwave background, appears to disfavor slow-roll inflation and the associated transition of modes across the horizon. We show in this Letter that kmin instead corresponds to the first mode emerging out of the Planck domain into the semi-classical universe. The required scalar-field potential is exponential, though not inflationary, and satisfies the zero active mass condition, ρϕ+3pϕ=0. Quite revealingly, the observed amplitude of the temperature anisotropies requires the quantum fluctuations in ϕ to have classicalized at ∼3.5×1015 GeV, consistent with the energy scale in grand unified theories. Such scalar-field potentials are often associated with Kaluza–Klein cosmologies, string theory and even supergravity.
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