期刊
PHYSICAL REVIEW D
卷 91, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.91.024029
关键词
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资金
- Chilean Government through the Centers of Excellence Base Financing Program of Conicyt
- Alexander von Humboldt Foundation
- Fondecyt [11130262]
Efforts to understand the origin of the cosmological constant. and its observed value have led to consider it as a dynamical field rather than as a universal constant. The possibility then arises that the universe, or regions of it, might be in a superposition of quantum states with different values of. so that its actual value would not be definite. There appears to be no argument to rule out this possibility for a generic spacetime dimension D. However, as proved herein, for D = 3 there exists a superselection rule that forbids such superpositions. The proof is based on the asymptotic symmetry algebra.
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