TY - JOUR
T1 - Quantum corrections to scalar field dynamics in a slow-roll space-time
AU - Herranen, Matti Henrikki
AU - Markkanen, Tommi
AU - Tranberg, Anders
N1 - e-Print: arXiv:1311.5532
PY - 2014/5/7
Y1 - 2014/5/7
N2 - We consider the dynamics of a quantum scalar field in the background of a slow-roll inflating Universe. We compute the one-loop quantum corrections to the field and Friedmann equation of motion, in both a 1PI and a 2PI expansion, to leading order in slow-roll. Generalizing the works of [1-4], we then solve these equations to compute the effect on the primordial power spectrum, for the case of a self-interacting inflaton and a self-interacting spectator field. We find that for the inflaton the corrections are negligible due to the smallness of the coupling constant despite the large IR enhancement of the loop contributions. For a curvaton scenario, on the other hand, we find tension in using the 1PI loop corrections, which may indicate that the quantum corrections could be non-perturbatively large in this case, thus requiring resummation.
AB - We consider the dynamics of a quantum scalar field in the background of a slow-roll inflating Universe. We compute the one-loop quantum corrections to the field and Friedmann equation of motion, in both a 1PI and a 2PI expansion, to leading order in slow-roll. Generalizing the works of [1-4], we then solve these equations to compute the effect on the primordial power spectrum, for the case of a self-interacting inflaton and a self-interacting spectator field. We find that for the inflaton the corrections are negligible due to the smallness of the coupling constant despite the large IR enhancement of the loop contributions. For a curvaton scenario, on the other hand, we find tension in using the 1PI loop corrections, which may indicate that the quantum corrections could be non-perturbatively large in this case, thus requiring resummation.
U2 - 10.1007/JHEP05(2014)026
DO - 10.1007/JHEP05(2014)026
M3 - Journal article
SN - 1126-6708
VL - 2014
JO - Journal of High Energy Physics (Online)
JF - Journal of High Energy Physics (Online)
IS - 5
M1 - 026
ER -