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- W4252590906 abstract "The model of natural inflation is examined in light of recent 3-year data from the Wilkinson Microwave Anisotropy Probe and shown to provide a good fit. The inflaton potential is naturally flat due to shift symmetries, and in the simplest version takes the form $V(ensuremath{phi})={ensuremath{Lambda}}^{4}[1ifmmodepmelsetextpmfi{}mathrm{cos}(Nensuremath{phi}/f)]$. The model agrees with WMAP3 measurements as long as $f>0.7{m}_{mathrm{Pl}}$ (where ${m}_{mathrm{Pl}}=1.22ifmmodetimeselsetexttimesfi{}{10}^{19}text{ }text{ }mathrm{GeV}$) and $ensuremath{Lambda}ensuremath{sim}{m}_{mathrm{GUT}}$. The running of the scalar spectral index is shown to be small---an order of magnitude below the sensitivity of WMAP3. The location of the field in the potential when perturbations on observable scales are produced is examined; for $f>5{m}_{mathrm{Pl}}$, the relevant part of the potential is indistinguishable from a quadratic, yet has the advantage that the required flatness is well-motivated. Depending on the value of $f$, the model falls into the large field ($fensuremath{ge}1.5{m}_{mathrm{Pl}}$) or small field ($f<1.5{m}_{mathrm{Pl}}$) classification scheme that has been applied to inflation models. Natural inflation provides a good fit to WMAP3 data." @default.
- W4252590906 created "2022-05-12" @default.
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- W4252590906 date "2006-12-13" @default.
- W4252590906 modified "2023-10-16" @default.
- W4252590906 title "Natural inflation: Status after WMAP 3-year data" @default.
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- W4252590906 doi "https://doi.org/10.1103/physrevd.74.123511" @default.
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