Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2010-01-25
Phys.Rev.D81:084057,2010
Physics
High Energy Physics
High Energy Physics - Theory
11 pages
Scientific paper
10.1103/PhysRevD.81.084057
Scale invariant (transverse) gravitational theories are introduced. They are invariant under pure metric rescalings (i.e. the matter fields are inert under those). This symmetry forbids the presence of a cosmological constant. Those theories are not invariant under the full set of diffeomorphisms, but only with respect to those locally characterized by the fact that their generator is transverse $\pd_\a \xi^\a=0$.
Alvarez Enrique
Vidal Roberto
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