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      Low reheating temperatures in monomial and binomial inflationary potentials

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          Abstract

          We investigate the allowed range of reheating temperature values in light of the Planck 2015 results and the recent joint analysis of Cosmic Microwave Background (CMB) data from the BICEP2/Keck Array and Planck experiments, using monomial and binomial inflationary potentials. While the well studied \(\phi^2\) inflationary potential is no longer favored by current CMB data, as well as \(\phi^p\) with \(p>2\), a \(\phi^1\) potential and canonical reheating (\(w_{re}=0\)) provide a good fit to the CMB measurements. In this last case, we find that the Planck 2015 \(68\%\) confidence limit upper bound on the spectral index, \(n_s\), implies an upper bound on the reheating temperature of \(T_{re}\lesssim 6\times 10^{10}\,{\rm GeV}\), and excludes instantaneous reheating. The low reheating temperatures allowed by this model open the possiblity that dark matter could be produced during the reheating period instead of when the Universe is radiation dominated, which could lead to very different predictions for the relic density and momentum distribution of WIMPs, sterile neutrinos, and axions. We also study binomial inflationary potentials and show the effects of a small departure from a \(\phi^1\) potential. We find that as a subdominant \(\phi^2\) term in the potential increases, first instantaneous reheating becomes allowed, and then the lowest possible reheating temperature of \(T_{re}=4\,{\rm MeV}\) is excluded by the Planck 2015 \(68\%\) confidence limit.

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          Coherent scalar-field oscillations in an expanding universe

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            Particle production in the new inflationary cosmology

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              Gravity Waves and Linear Inflation from Axion Monodromy

              Wrapped branes in string compactifications introduce a monodromy that extends the field range of individual closed-string axions to beyond the Planck scale. Furthermore, approximate shift symmetries of the system naturally control corrections to the axion potential. This suggests a general mechanism for chaotic inflation driven by monodromy-extended closed-string axions. We systematically analyze this possibility and show that the mechanism is compatible with moduli stabilization and can be realized in many types of compactifications, including warped Calabi-Yau manifolds and more general Ricci-curved spaces. In this broad class of models, the potential is linear in the canonical inflaton field, predicting a tensor to scalar ratio r=0.07 accessible to upcoming cosmic microwave background (CMB) observations.
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                Author and article information

                Journal
                14 April 2015
                2015-04-23
                Article
                1504.03768
                27281b77-0da7-47c3-b381-ed95ecc9fa4b

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

                History
                Custom metadata
                17 pages, 5 figures, v2: some references added and typos corrected
                hep-ph astro-ph.CO

                Cosmology & Extragalactic astrophysics,High energy & Particle physics
                Cosmology & Extragalactic astrophysics, High energy & Particle physics

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