For D=2n Starobinsky inflation, the shift in the spectral index and tensor-to-scalar ratio caused by an extra R^m term shrinks as the spacetime dimension increases, relaxing the constraints on that term's coefficient.
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Relaxation of hierarchy in higher-dimensional Starobinsky model
For D=2n Starobinsky inflation, the shift in the spectral index and tensor-to-scalar ratio caused by an extra R^m term shrinks as the spacetime dimension increases, relaxing the constraints on that term's coefficient.