Waterfall steps in single-field alpha-attractor potentials increase the effective number of e-folds, raising ns toward 1 and lowering r along the curve r = 3 alpha (1 - ns)^2.
Linde,Axions in inflationary cosmology,Phys
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Waterfall-modulated $\alpha$-attractors
Waterfall steps in single-field alpha-attractor potentials increase the effective number of e-folds, raising ns toward 1 and lowering r along the curve r = 3 alpha (1 - ns)^2.