TY - JOUR

T1 - Implications of the scalar tilt for the tensor-to-scalar ratio

AU - Creminelli, Paolo

AU - Dubovsky, Sergei

AU - López Nacir, Diana

AU - Simonović, Marko

AU - Trevisan, Gabriele

AU - Villadoro, Giovanni

AU - Zaldarriaga, Matias

PY - 2015/12/23

Y1 - 2015/12/23

N2 - We investigate the possible implications of the measured value of the scalar tilt ns for the tensor-to-scalar ratio r in slow-roll, single-field inflationary models. The measured value of the tilt satisfies ns-1∼1/N∗, where N∗∼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.

AB - We investigate the possible implications of the measured value of the scalar tilt ns for the tensor-to-scalar ratio r in slow-roll, single-field inflationary models. The measured value of the tilt satisfies ns-1∼1/N∗, where N∗∼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.

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U2 - 10.1103/PhysRevD.92.123528

DO - 10.1103/PhysRevD.92.123528

M3 - Article

AN - SCOPUS:84953286216

VL - 92

JO - Physical Review D - Particles, Fields, Gravitation and Cosmology

JF - Physical Review D - Particles, Fields, Gravitation and Cosmology

SN - 1550-7998

IS - 12

M1 - 123528

ER -