Natural Inflation: the status after WMAP 3-year data

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dc.creatorFreese, Katherine
dc.creatorKinney, William H.
dc.creatorSavage, Christopher
dc.date2008-02-02
dc.date.accessioned2026-07-07T11:14:09Z
dc.date.available2026-07-07T11:14:09Z
dc.descriptionThe 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 $V(ϕ) = Λ^4 [1 \pm \cos(Nϕ/f)]$. The model agrees with WMAP3 measurements as long as $f > 0.7 m_{Pl}$ (where $m_{Pl} = 1.22 \times 10^{19}$GeV) and $Λ\sim m_{GUT}$. 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 $f > 5 m_{Pl}$, 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 ($f \ge 1.5 m_{Pl}$) or small field ($f < 1.5 m_{Pl}$) classification scheme that has been applied to inflation models. Natural inflation provides a good fit to WMAP3 data.
dc.descriptionTo appear in the proceedings of From Quantum to Cosmos: Fundamental Physics Research in Space, Washington, D.C., 22-24 May 2006
dc.identifierhttps://arxiv.org/abs/0802.0227
dc.identifierhttp://arxiv.org/abs/0802.0227
dc.identifierInt.J.Mod.Phys.D16:2573-2585,2008
dc.identifierdoi:10.1142/S0218271807011371
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/191967
dc.subjectHigh Energy Physics - Phenomenology
dc.titleNatural Inflation: the status after WMAP 3-year data
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