https://doi.org/10.1140/epjc/s10052-024-13333-0
Regular Article - Theoretical Physics
On the consistency of rapid-turn inflation
Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, 1784, Sofia, Bulgaria
Received:
5
June
2024
Accepted:
4
September
2024
Published online:
18
September
2024
Recent studies, in the context of consistency conditions for rapid-turn and third order slow-roll inflation in two-field models, raised the question whether this regime can be sustained for more than a few e-folds of expansion. We answer this question in the affirmative by showing that the consistency conditions themselves ensure the longevity of the rapid-turn regime. Furthermore, we prove this for the most general definition of rapid turning (i.e., with a turning rate that is large compared to the slow-roll parameters, but not necessarily large compared to unity), using in the process a generalized consistency condition. We also show that a special class of rapid-turn models, including angular inflation, satisfy a large-(compared to 1)-turn-rate condition even for non-large turning rates.
© The Author(s) 2024
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