期刊
PHYSICS LETTERS B
卷 702, 期 1, 页码 90-93出版社
ELSEVIER
DOI: 10.1016/j.physletb.2011.06.056
关键词
Massive gravity
资金
- Swedish Research Council (VR) through the Oskar Klein Centre
The auxiliary extra-dimension model was proposed in order to provide a geometrical interpretation to modifications of general relativity, in particular to non-linear massive gravity. In this context, the theory was shown to be ghost free to third order in perturbations, in the decoupling limit. In this work, we exactly solve the equation of motion in the extra dimension, to obtain a purely 4-dimensional theory. Using this solution, it is shown that the ghost appears at the fourth order and beyond. We explore potential modifications to address the ghost issue and find that their consistent implementation requires going beyond the present framework. (C) 2011 Elsevier B.V. All rights reserved.
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