Natural Inflation: status after WMAP 3-year data

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dc.creatorSavage, Christopher
dc.creatorFreese, Katherine
dc.creatorKinney, William H.
dc.date2006-09-15
dc.date2006-11-16
dc.date.accessioned2026-07-07T10:25:26Z
dc.date.available2026-07-07T10:25:26Z
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.description9 pages, 8 figures. v2: Added references and minor revisions. Submitted to PRD
dc.identifierhttps://arxiv.org/abs/hep-ph/0609144
dc.identifierhttp://arxiv.org/abs/hep-ph/0609144
dc.identifierPhys.Rev.D74:123511,2006
dc.identifierdoi:10.1103/PhysRevD.74.123511
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/176542
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectAstrophysics
dc.titleNatural Inflation: status after WMAP 3-year data
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