New agegraphic dark energy as a rolling tachyon

• Published in: Chinese physics B Vol. 19; no. 1; pp. 600 - 605
• Main Author: 崔晶磊 张莉 张敬飞 张鑫
• Format: Journal Article
• Language: English
• Published: IOP Publishing 2010
• Subjects: Tachyon; 广义相对论; 暗能量; 标量场; 能量模型; 超光速粒子
• ISSN: 1674-1056; 2058-3834
• DOI: 10.1088/1674-1056/19/1/019802

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.