Abstract
There is a widespread belief among inflationary cosmologists that a local observer cannot sense super-horizon gravitons. The argument goes that a local observer would subsume super-horizon gravitons into a redefinition of his coordinate system. We show that adopting this view for pure gravity on de Sitter background leads to time variation in the Hubble parameter measured by a local observer. It also leads to a violation of the gravitational field equation R = 4Λ because that equation is obeyed by the full metric, rather than the one which has been cleansed of super-horizon modes.
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Basu, S., Tsamis, N.C. & Woodard, R.P. Causality implies inflationary back-reaction. J. High Energ. Phys. 2017, 37 (2017). https://doi.org/10.1007/JHEP07(2017)037
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DOI: https://doi.org/10.1007/JHEP07(2017)037