GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS |
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New agegraphic dark energy as a rolling tachyon |
Cui Jing-Lei(崔晶磊),Zhang Li(张莉), Zhang Jing-Fei(张敬飞), and Zhang Xin(张鑫) |
Department of Physics, College of Sciences, Northeastern University, Shenyang 110004, China |
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Abstract Combining the general relativity and the uncertainty relation in quantum mechanics, the energy density of quantum fluctuations of space-time can be viewed as dark energy. The so-called agegraphic dark energy model is just based on this viewpoint, in which the age of the universe is introduced as the length measure. Recently, the new agegraphic dark energy model was proposed, where the dynamical dark energy is measured by the conformal age of the universe. On the other hand, scalar-field dark energy models like tachyons are often regarded as an effective description of some underlying theory of dark energy. In this paper, we show that the new agegraphic dark energy can be described completely by a tachyon scalar-field. We thus reconstruct the potential and the dynamics of the tachyon scalar-field, according to the evolution of the new agegraphic dark energy.
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Received: 09 April 2009
Revised: 05 May 2009
Accepted manuscript online:
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PACS:
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95.36.+x
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(Dark energy)
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04.20.Gz
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(Spacetime topology, causal structure, spinor structure)
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14.80.-j
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(Other particles (including hypothetical))
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95.30.Cq
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(Elementary particle processes)
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95.30.Sf
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(Relativity and gravitation)
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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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Fund: Project supported by the National
Natural Science Foundation of China (Grant No. 10705041). |
Cite this article:
Cui Jing-Lei(崔晶磊),Zhang Li(张莉), Zhang Jing-Fei(张敬飞), and Zhang Xin(张鑫) New agegraphic dark energy as a rolling tachyon 2010 Chin. Phys. B 19 019802
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