The (pseudo)issue of the conformal frame revisited

Details The (pseudo)issue of the conformal frame revisited The (pseudo)issue of the conformal frame revisited

2006-12-12

arxiv.org/abs/gr-qc/0612075v1

Phys.Rev.D75:023501,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

29 pages, latex, to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.75.023501

The issue of the equivalence between Jordan and Einstein conformal frames in scalar-tensor gravity is revisited, with emphasis on implementing running units in the latter. The lack of affine parametrization for timelike worldlines and the cosmological constant problem in the Einstein frame are clarified, and a paradox in the literature about cosmological singularities appearing only in one frame is solved. While, classically, the two conformal frames are physically equivalent, they seem to be inequivalent at the quantum level.

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