Hybrid α-attractor models Kallosh:2022ggf can have significantly greater values of ns and smaller r, while preserving the relation r≅3α(1−ns)2
Nearby in the stack
, which is valid for exponential T- and E-models at large values of the inflaton field. Here we study single-field
α
-attractors with features inspired by hybrid models: one can uplift the potential, and one can also have a waterfall regime that leads to a premature termination of inflation near the critical point
φc
. This allows one to increase the effective number of e-foldings
Nc
in formulas like
ns≃1−Nc2
,
r≃Nc212α
. By changing the waterfall's steepness and location, one can continuously move the predictions along the curves with
r≅3α(1−ns)2
as
ns
increases and
r
decreases. We also study the effect of waterfall insertions and uplift on
ns
in quintessential
α
-attractors that describe inflation and dynamical dark energy.
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