TY  - JOUR
AU  - Boubekeur, L.
AU  - Giusarma, E.
AU  - Mena, O.
AU  - Ramirez, H.
PY  - 2015
DA  - 2015//
TI  - Phenomenological approaches of inflation and their equivalence
T2  - Phys. Rev. D
JO  - Physical Review D
SP  - 083006
EP  - 8pp
VL  - 91
IS  - 8
PB  - Amer Physical Soc
AB  - In this work, we analyze two possible alternative and model-independent approaches to describe the inflationary period. The first one assumes a general equation of state during inflation due to Mukhanov, while the second one is based on the slow-roll hierarchy suggested by Hoffman and Turner. We find that, remarkably, the two approaches are equivalent from the observational viewpoint, as they single out the same areas in the parameter space, and agree with the inflationary attractors where successful inflation occurs. Rephrased in terms of the familiar picture of a slowly rolling, canonically normalized scalar field, the resulting inflaton excursions in these two approaches are almost identical. Furthermore, once the Galactic dust polarization data from Planck are included in the numerical fits, inflaton excursions can safely take sub-Planckian values.
SN  - 1550-7998
UR  - http://arxiv.org/abs/1411.7237
UR  - https://doi.org/10.1103/PhysRevD.91.083006
DO  - 10.1103/PhysRevD.91.083006
LA  - English
N1  - WOS:000353138800002
ID  - Boubekeur_etal2015
ER  -