Improved action functionals in non-perturbative quantum gravity

被引：2

作者：

Bonanno, A

Esposito, G

Rubano, C

机构：

[1] Observ Astrofis, I-95123 Catania, Italy

[2] Ist Nazl Fis Nucl, Sez Catania, I-95129 Catania, Italy

[3] Complesso Univ Monte S Angelo, Ist Nazl Fis Nucl, Sez Napoli, I-80126 Naples, Italy

[4] Complesso Univ Monte S Angelo, Univ Naples Federico II, Dipartimento Sci Fisiche, I-80126 Naples, Italy

来源：

INTERNATIONAL JOURNAL OF MODERN PHYSICS A | 2005年 / 20卷 / 11期

关键词：

renormalization group; quantum gravity;

D O I：

10.1142/S0217751X05024626

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

Models of gravity with variable G and A 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

页码：2358 / 2363

页数：6