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
N1 - Publisher Copyright:
© 2015 American Physical Society.
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
SN - 1550-7998
VL - 92
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 12
M1 - 123528
ER -