Dark energy as space-time curvature induced by quantum vacuum fluctuations

被引:11
作者
Santos, Emilio [1 ]
机构
[1] Univ Cantabria, Dept Fis, E-39005 Santander, Spain
关键词
Dark energy; Vacuum fluctuations; Quantum gravity;
D O I
10.1007/s10509-010-0557-x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
It is shown that quantum vacuum fluctuations give rise to a curvature of space-time equivalent to a cosmological constant, that is a homogeneous energy density rho and pressure p fulfilling -p=rho > 0. The fact that the fluctuations produce curvature, even if the vacuum expectation of the energy vanishes, is a consequence of the non-linear character of the Einstein equation. A calculation is made, involving plausible hypotheses within quantized gravity, which establishes a relation between the two-point correlation of the vacuum fluctuations and the space-time curvature. Arguments are given which suggest that the density rho might be of order the "dark energy" density currently assumed to explain the observed accelerated expansion of the universe.
引用
收藏
页码:423 / 435
页数:13
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