In this two-field completion, trajectories connected to the Starobinsky solution keep entropy modes suppressed so that curvature and tensor perturbations remain effectively single-field Starobinsky-like.
Ketov and Alexei A
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Robustness of Starobinsky inflation in a minimal two-field scalar-tensor completion
In this two-field completion, trajectories connected to the Starobinsky solution keep entropy modes suppressed so that curvature and tensor perturbations remain effectively single-field Starobinsky-like.