Improved Action Functionals in Non-Perturbative Quantum Gravity

Details Improved Action Functionals in Non-Perturbative Quantum Gravity Improved Action Functionals in Non-Perturbative Quantum Gravity

2005-11-18

arxiv.org/abs/hep-th/0511188v1

Int.J.Mod.Phys. A20 (2005) 2358-2363

Physics

High Energy Physics

High Energy Physics - Theory

Latex file. Record without file already exists on SLAC-SPIRES, and hence that record and the one for the present arxiv submiss

Scientific paper

10.1142/S0217751X05024626

Models of gravity with variable G and Lambda have acquired greater relevance after the recent evidence in favour of the Einstein theory being non-perturbatively renormalizable in the Weinberg sense. The present paper builds a modified Arnowitt-Deser-Misner (ADM) action functional for such models which leads to a power-law growth of the scale factor for pure gravity and for a massless phi**4 theory in a Universe with Robertson-Walker symmetry, in agreement with the recently developed fixed-point cosmology. Interestingly, the renormalization-group flow at the fixed point is found to be compatible with a Lagrangian description of the running quantities G and Lambda.

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