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Consistency of Relevant Cosmological Deformations on all Scales

By Felix Berkhahn, Dennis D. Dietrich and Stefan Hofmann


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.Comment: 22 pages, 4 figure

Topics: High Energy Physics - Theory, Astrophysics - Cosmology and Nongalactic Astrophysics, General Relativity and Quantum Cosmology
Year: 2011
DOI identifier: 10.1088/1475-7516/2011/09/024
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