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.
Unification of polynomial and exponential cosmological attractors
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abstract
We introduce a family of simple $\alpha$-attractor models that can interpolate between exponential and polynomial cosmological attractors. By varying the interpolation parameter $\mu$ in these models, one can scan a wide range of values of the spectral index $n_{s}$ matching any combination of CMB and DESI data.
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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.