http://arxiv.org/abs/1705.06380
While the accumulation of long wavelength modes during inflation wreaks havoc on the large scale structure of spacetime, the question of even observability of their presence by any local observer has lead to considerable confusion. Though it is commonly agreed that infrared effects are not visible to a single sub-horizon observer at late times, we argue that the question is less trivial for a \emph{patient observer} who has lived long enough to have a record of the state before the soft mode was created. Though classically there is no obstruction to measuring this effect locally, we give several indications that quantum mechanical uncertainties censor the effect, rendering the observation of long modes ultimately forbidden.
R. Ferreira, M. Sandora and M. Sloth
Fri, 19 May 17
20/62
Comments: 7 pages, awarded honorable mention in the 2017 Gravity Research Foundation Essays on Gravitation competition