Consistency of Relevant Cosmological Deformations on all Scales
arXiv:1104.2534 · doi:10.1088/1475-7516/2011/09/024
Abstract
Using cosmological perturbation theory we show that the most relevant defor- mation of gravity is consistent at the linear level. In particular, we prove the absence of uni- tarity violating negative norm states in the weak coupling regime from sub- to super-Hubble scales. This demonstrates that the recently proposed classical self-protection mechanism of deformed gravity extends to the entire kinematical domain.
22 pages, 4 figures
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