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- W2009395009 abstract "We investigate the coupling to matter in ghost-free massive (bi-)gravity. When species in the matter sector couple covariantly to only one metric, we show that at one--loop these couplings do not spoil the special structure of the graviton potential. When the same species couples directly to both metrics we show that a ghost is present at the classical level and that loops destroy the special structure of the potential at an unacceptably low scale. We then propose a new `composite' effective metric built out of both metrics. When matter fields couple covariantly to this effective metric, the would be Boulware--Deser ghost is absent in different representative limits. At one--loop such couplings do not detune the special structure of the potential. We conjecture that matter can couple covariantly to that effective metric in all generality without introducing any Boulware--Deser ghost below a cut-off scale parametrically larger than the strong coupling scale. We also discuss alternative couplings to matter where the kinetic and potential terms of the matter field couple to different metrics. In both cases we discuss preliminary implications for cosmology." @default.
- W2009395009 created "2016-06-24" @default.
- W2009395009 creator A5003098893 @default.
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- W2009395009 date "2015-01-14" @default.
- W2009395009 modified "2023-09-26" @default.
- W2009395009 title "On couplings to matter in massive (bi-)gravity" @default.
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- W2009395009 doi "https://doi.org/10.1088/0264-9381/32/3/035022" @default.
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