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A Conjecture on the Origin of Dark Energy |
| GAO Shan |
| Institute of Electronics, Chinese Academy of Sciences, Beijing 100080 |
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| Cite this article: |
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GAO Shan 2005 Chin. Phys. Lett. 22 783-784 |
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Abstract A conjecture on the origin of the dark energy in our universe is proposed. The analysis indicates that the dark energy may originate from the quantum fluctuations of space--time limited in our universe. Applying both the uncertainty principle and the holographic principle, the author finds that the density of such quantum fluctuation energy is ρ V = 3c4 /32GLH 2, where LH is the size of the event horizon of our universe and G is the gravitational constant. Using this dark energy model which contains no adjustable parameters, we obtain the current fraction ΩΛ≡ ρV/ρc π/4 and the corresponding equation of state w(z) approximate - 1 + (1 - π /4)z with ρc being the critical energy density. These theoretical results are perfectly consistent with the recent cosmological observations. The striking coincidence implies that the quantum fluctuation energy of space--time may be the only source of dark energy. In addition, the analysis shows that the vacuum fluctuation energy does exist, but it comes from space--time rather than matter. This may have some deep implications for discrete space--time and quantum gravity.
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| Keywords:
98.80.Bp
98.80.Cq
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Published: 01 March 2005
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| PACS: |
98.80.Bp
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(Origin and formation of the Universe)
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98.80.Cq
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(Particle-theory and field-theory models of the early Universe (including cosmic pancakes, cosmic strings, chaotic phenomena, inflationary universe, etc.))
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