arXiv:0711.4263·v2·Astrophysics
On the Physical Significance of Infra-red Corrections to Inflationary Observables
N. Bartolo (1 and 2) · S. Matarrese (1 and 2) · M. Pietroni (2) · A. Riotto (2 and 3) · D. Seery (4) ((1) Physics Dept. Padova, Italy; (2) INFN, Padova, Italy; (3) CERN, Switzerland; (4) Centre for Theoretical Cosmology, Cambridge, UK)
Abstract
Inflationary observables, like the power spectrum, computed at one- and higher-order loop level seem to be plagued by large infra-red corrections. In this short note, we point out that these large infra-red corrections appear only in quantities which are not directly observable. This is in agreement with general expectations concerning infra-red effects.
Comments: 11 pages; LateX file; 5 figures. Some coefficients in Eq.(A6) corrected; References added