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Consistency relation for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>R</mml:mi><mml:mi>p</mml:mi></mml:msup></mml:math>inflation
We consider ${R}^{p}$ inflation with $p\ensuremath{\approx}2$, allowing small deviation from ${R}^{2}$ inflation. Using the inflaton potential in the Einstein frame, we construct a consistency relation between the scalar spectral index, the tensor-to-scalar ratio, as well as the running of the scalar spectral index, which will be useful to constrain a …