Dynamical diffeomorphisms

被引：5

作者：

Ferrero, Renata ^{[1
]}

Percacci, Roberto ^{[2
,3
]}

机构：

[1] Johannes Gutenberg Univ Mainz, Inst Phys THEP, Staudingerweg 7, D-55128 Mainz, Germany

[2] Scuola Int Super Studi Avanzati, Via Bonomea 265, I-34136 Trieste, Italy

[3] INFN, Sez Trieste, Trieste, Italy

来源：

CLASSICAL AND QUANTUM GRAVITY | 2021年 / 38卷 / 11期

关键词：

diffeomorphism invariance; nonlinear sigma model; massive gravity; effective cosmological constant; quantum gravity; dynamical coordinates; relational observables; COMPLETE OBSERVABLES; FIELD-THEORY; QUANTUM; SPACE;

D O I：

10.1088/1361-6382/abf627

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We construct a general effective dynamics for diffeomorphisms of spacetime, in a fixed external metric. Though related to familiar models of scalar fields as coordinates, our models have subtly different properties, both at kinematical and dynamical level. The energy-momentum (EM) tensor consists of two independently conserved parts. The background solution is the identity diffeomorphism and the EM tensor of this solution gives rise to an effective cosmological constant.

引用

页数：25

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