Ground State of the Universe and the Cosmological Constant. A Nonperturbative Analysis

被引：21

作者：

Husain, Viqar ^{[1
]}

Qureshi, Babar ^{[2
]}

机构：

[1] Univ New Brunswick, Dept Math & Stat, Fredericton, NB E3B 5A3, Canada

[2] LUMS Sch Sci & Engn, Dept Phys, Lahore, Pakistan

来源：

PHYSICAL REVIEW LETTERS | 2016年 / 116卷 / 06期

基金：

加拿大自然科学与工程研究理事会;

关键词：

Ground state - Cosmology - Gravitation;

D O I：

10.1103/PhysRevLett.116.061302

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The physical Hamiltonian of a gravity-matter system depends on the choice of time, with the vacuum naturally identified as its ground state. We study the expanding Universe with scalar field in the volume time gauge. We show that the vacuum energy density computed from the resulting Hamiltonian is a nonlinear function of the cosmological constant and time. This result provides a new perspective on the relation between time, the cosmological constant, and vacuum energy.

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