Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2010-06-29
Astrophys.Space Sci.332:423-435,2011
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
Accepted in Astrophysics and Space Science
Scientific paper
10.1007/s10509-010-0557-x
It is shown that quantum vacuum fluctuations give rise to a curvature of space-time of the order appropriate to explain the observed accelerated expansion of the universe. The fact that the fluctuations produce curvature, even if the expectation of the vacuum 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.
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