Husain Viqar, Qureshi Babar
Department of Mathematics and Statistics, University of New Brunswick, Fredericton, New Brunswick, Canada E3B 5A3.
Department of Physics, LUMS School of Science and Engineering, Lahore, Pakistan.
Phys Rev Lett. 2016 Feb 12;116(6):061302. doi: 10.1103/PhysRevLett.116.061302.
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.
引力-物质系统的物理哈密顿量取决于时间的选择，真空自然地被视为其基态。我们在体积时间规范下研究具有标量场的膨胀宇宙。我们表明，由所得哈密顿量计算出的真空能量密度是宇宙学常数和时间的非线性函数。这一结果为时间、宇宙学常数和真空能量之间的关系提供了一个新的视角。
