Kinetically modified non-minimal inflation with exponential frame function

• Main Author: C. Pallis
• Format: Article
• Language: English
• Published: SpringerOpen 2017-09-01
• Series: European Physical Journal C: Particles and Fields
• Online Access: http://link.springer.com/article/10.1140/epjc/s10052-017-5165-2

Abstract We consider supersymmetric (SUSY) and non-SUSY models of chaotic inflation based on the $$\phi ^n$$ ϕ n potential with $$n=2$$ n = 2 or 4. We show that the coexistence of an exponential non-minimal coupling to gravity $$f_\mathcal{R}=\mathrm{e}^{c_\mathcal{R}\phi ^{p}}$$ f R = e c R ϕ p with a kinetic mixing of the form $$f_{\mathrm{K}}=c_{\mathrm{K}}f_\mathcal{R}^m$$ f K = c K f R m can accommodate inflationary observables favored by the Planck and Bicep2/Keck Array results for $$p=1$$ p = 1 and 2, $$1\le m\le 15$$ 1 ≤ m ≤ 15 and $$2.6\times 10^{-3}\le r_{\mathcal {R}\mathrm{K}}=c_\mathcal{R}/c_{\mathrm{K}}^{p/2}\le 1,$$ 2.6 × 10 - 3 ≤ r R K = c R / c K p / 2 ≤ 1 , where the upper limit is not imposed for $$p=1$$ p = 1 . Inflation is of hilltop type and it can be attained for subplanckian inflaton values with the corresponding effective theories retaining the perturbative unitarity up to the Planck scale. The supergravity embedding of these models is achieved employing two chiral gauge singlet supefields, a monomial superpotential and several (semi)logarithmic or semi-polynomial Kähler potentials.