On: Natural Inflation
نویسندگان
چکیده
We re-examine the original model of Natural inflation, in which the inflaton is a pseudo Nambu-Goldstone boson with potential of the form V (φ) = Λ[1 ± cos(φ/f)], in light of recent data. We find that the model is alive and well. Successful inflation as well as recent data from the Wilkinson Microwave Anisotropy probe require f > 0.6mPl (where mPl = 1.22 × 10 19 GeV) and Λ ∼ mGUT , scales which can be accommodated in particle physics models. The detectability of tensor modes from natural inflation in upcoming microwave background experiments is discussed. We find that natural inflation predicts a tensor/scalar ratio within reach of future observations. PACS numbers: 98.80 Bp, Cq
منابع مشابه
Modeling the Impact of Inflation Uncertainty on Food Sector Growth
Background: One of the most fundamental objectives of the macroeconomic policies is to realize the relationship between economic growth and inflation. According to some monetary policy advisors, inflation reflects erosion in consumer’s purchasing power. Inflation as an important economic variable, affect the economic growth and its impact on economic growth has been proposed in various theories...
متن کاملInstitutional Quality, Natural Resource Rent, and Shadow Economy
Natural resource rent affects countries’ economies through various channels. Revenues from the natural resources sales are expected to boost countries' economic growth, but the economic experience of recent decades reveals the numerous economic problems in these countries, the most important of which may be the increase in the shadow economy size. Moreover, the institutions specify the signific...
متن کاملSaving Natural Inflation
Slow-roll inflation requires the inflaton field to have an exceptionally flat potential, which combined with measurements of the scale of inflation demands some degree of finetuning. Alternatively, the flatness of the potential could be due to the inflaton’s origin as a pseudo-Goldstone boson, as in Natural Inflation. Alas, consistency with Planck data places the original proposal of Natural In...
متن کاملNatural Double Inflation in Supergravity
We propose a natural double inflation model in supergravity. In this model, chaotic inflation first takes place by virtue of the Nambu-Goldstone-like shift symmetry, which guarantees the absence of the exponential factor in the potential for the inflaton field. During chaotic inflation, an initial value of the second inflation (new inflation) is set. In this model, the initial value of new infl...
متن کاملPerspective on completing natural inflation
*Correspondence: Bumseok Kyae, Department of Physics, Pusan National University, Busan 609-735, South Korea e-mail: [email protected] We present a perspective on the inflation paths in 2−,3−, . . . ,N−flation models based on the ultraviolet completion in heterotic string theory, where a number of grand unification scale axions are used. The number of non-Abelian gauge groups for a natural infla...
متن کامل