Nonsingular cosmology from evolutionary quantum gravity

被引：8

作者：

Cianfrani, Francesco ^{[1
]}

Montani, Giovanni ^{[2
]}

Pittorino, Fabrizio ^{[3
]}

机构：

[1] Univ Wroclaw, Inst Theoret Phys, PL-50204 Wroclaw, Poland

[2] ENEA, Ctr Ric Frascati, Unita Tecn Fus, I-00044 Rome, Italy

[3] Univ Roma La Sapienza, I-00185 Rome, Italy

来源：

PHYSICAL REVIEW D | 2014年 / 90卷 / 10期

关键词：

TIME; SPACE;

D O I：

10.1103/PhysRevD.90.103503

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We provide a cosmological implementation of the evolutionary quantum gravity, describing an isotropic Universe, in the presence of a negative cosmological constant and a massive (preinflationary) scalar field. We demonstrate that the considered Universe has a nonsingular quantum behavior, associated to a primordial bounce, whose ground state has a high occupation number. Furthermore, in such a vacuum state, the super-Hamiltonian eigenvalue is negative, corresponding to a positive emerging dust energy density. The regularization of the model is performed via a polymer quantum approach to the Universe scale factor and the proper classical limit is then recovered, in agreement with a preinflationary state of the Universe. Since the dust energy density is redshifted by the Universe de Sitter phase and the cosmological constant does not enter the ground state eigenvalue, we get a late-time cosmology, compatible with the present observations, endowed with a turning point in the far future.

引用

页数：13