We investigate the possible implications of the measured value of the scalar tilt n(s) for the tensor-to-scalar ratio r in slow-roll, single-field inflationary models. The measured value of the tilt satisfies n(s) - 1 similar to 1/N-*, where N-* similar to 60 is the number of e-folds for observationally relevant scales. If this is not a coincidence and the scaling holds for different values of N, it strongly suggests that either r is as big as 10(-1) (a possibility in tension with the recent data), or smaller than 10(-2) and exponentially dependent on ns. A large region of the (ns,r) plane is not compatible with this scaling.
Implications of the scalar tilt for the tensor-to-scalar ratio / Creminelli, Paolo; Dubovsky, Sergei; Nacir, Diana Lopez; Simonovic, Marko; Trevisan, Gabriele; Villadoro, Giovanni; Zaldarriaga, Matias. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - STAMPA. - 92:(2015), pp. 123528-123532. [10.1103/PhysRevD.92.123528]
Implications of the scalar tilt for the tensor-to-scalar ratio
Simonovic, Marko;
2015
Abstract
We investigate the possible implications of the measured value of the scalar tilt n(s) for the tensor-to-scalar ratio r in slow-roll, single-field inflationary models. The measured value of the tilt satisfies n(s) - 1 similar to 1/N-*, where N-* similar to 60 is the number of e-folds for observationally relevant scales. If this is not a coincidence and the scaling holds for different values of N, it strongly suggests that either r is as big as 10(-1) (a possibility in tension with the recent data), or smaller than 10(-2) and exponentially dependent on ns. A large region of the (ns,r) plane is not compatible with this scaling.File | Dimensione | Formato | |
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