Phys. Rev. D 76, 124016 (2007) [7 pages]Remarks on the matter-graviton couplingReceived 15 August 2007; published 17 December 2007 We point out a generic inconsistency of the coupling of ordinary gravity as described by general relativity with matter invariant only under unimodular diffeomorphisms, and some previously studied exceptions are pointed out. The most general Lagrangian invariant under unimodular diffeomorphism up to dimension-five operators is determined, and consistency with existing observations is studied in some cases. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.76.124016
DOI:
10.1103/PhysRevD.76.124016
PACS:
04.50.+h, 04.80.Cc
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