Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 336, Issue 3, Pages 1007-1010Publisher
OXFORD UNIV PRESS
DOI: 10.1046/j.1365-8711.2002.05855.x
Keywords
early Universe
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Direct observations provide constraints on the first two derivatives of the inflaton potential in slow-roll models. We discuss how present-day observations, combined with the flow equations in slow-roll parameter space, provide a non-trivial constraint on the third derivative of the inflaton potential. We find a lower bound on the third derivative of the inflaton potential V'''/V > -0.2. We also show that unless the third derivative of the inflaton potential is unreasonably large, then one predicts the tensor-to-scalar ratio, r, to be bounded from below r > 3 x 10(-6).
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