Improved Action Functionals in Non-Perturbative Quantum Gravity
摘要
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.
引用
@article{arxiv.hep-th/0511188,
title = {Improved Action Functionals in Non-Perturbative Quantum Gravity},
author = {Alfio Bonanno and Giampiero Esposito and Claudio Rubano},
journal= {arXiv preprint arXiv:hep-th/0511188},
year = {2009}
}
备注
Latex file. Record without file already exists on SLAC-SPIRES, and hence that record and the one for the present arxiv submission should become one record only