For non-minimally coupled Palatini R^2 inflation with a runaway potential, the predicted primordial gravitational wave spectrum has two flat plateaus connected by a kination boost, and it becomes more observable as the coupling order decreases.
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Observable Primordial Gravitational Waves from Non-minimally Coupled $R^2$ Palatini Modified Gravity
For non-minimally coupled Palatini R^2 inflation with a runaway potential, the predicted primordial gravitational wave spectrum has two flat plateaus connected by a kination boost, and it becomes more observable as the coupling order decreases.