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- Non-slow-roll dynamics in α-attractorsPublication . Kumar, K. Sravan; Marto, João; Moniz, Paulo; Das, SuratnaIn this paper we consider the α−attractor model and study inflation under a non-slow-roll dynamics. More precisely, we follow the approach recently proposed by Gong and Sasaki [1] by means of assuming N=N(phi). Within this framework we obtain a family of functions describing the local shape of the potential during inflation. We study a specific model and find an inflationary scenario predicting an attractor at ns≈0.967 and r≈5.5×10^(−4). We further show that considering a non-slow-roll dynamics, the α−attractor model can be broaden to a wider class of models that remain compatible with value of r<0.1. We further explore the model parameter space with respect to large and small field inflation and conclude that the inflaton dynamics is connected to the α− parameter, which is also related to the Kähler manifold curvature in the supergravity (SUGRA) embedding of this model. We also comment on the stabilization of the inflaton's trajectory.
- Gravitational waves in α-attractorsPublication . Kumar, K. Sravan; Marto, João; Moniz, Paulo; Das, SuratnaWe study inflation in the alpha-attractor model under a non-slow-roll dynamics with an ansatz proposed by Gong & Sasaki of assuming N=N(phi). Under this approach, we construct a class of local shapes of inflaton potential that are different from the T-models. We find this type of inflationary scenario predicts an attractor at n_s~0.967 and r~0.00055. In our approach, the non-slow-roll inflaton dynamics are related to the $\alpha-$parameter which is the curvature of Kähler geometry in the SUGRA embedding of this model.