A comment on the matter-graviton coupling

Details A comment on the matter-graviton coupling A comment on the matter-graviton coupling

2007-07-28

arxiv.org/abs/0707.4221v5

Phys.Rev.D76:124016,2007

Physics

High Energy Physics

High Energy Physics - Theory

17 pages, 4 figures. References added

Scientific paper

10.1103/PhysRevD.76.124016

We point out a generic inconsistency of the coupling of ordinary gravity as described by general relativity with matter invariant under the subgroup of unimodular diffeomorphisms (TDiffs), and some previously studied exceptions are pointed out. The most general Lagrangian invariant under TDiff up to dimension five operators is determined, and restrictions on parameters coming from existing observations are studied in some cases.

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