新Agegraphic快子暗能量模型再探讨

Revisit of New Agegraphic Tachyon Dark Energy Model

摘要: 新agegraphic暗能量模型是依据量子力学的不确定性关系和广义相对论中的引力效应提出的。作为暗能量的候选者之一，动力学标量场被认为是暗能量基本理论的有效描述。本文把新agegraphic暗能量和标量场对应起来，构造具有新agegraphic暗能量性质的标量场模型，并利用观测数据来确定该标量场的拉氏量具体形式。本文考虑由暗能量、物质和辐射组成的平坦宇宙，通过标量场之一的快子场和新agegraphic暗能量的对应构造一个新agegraphic快子暗能量模型。参考最新拟合的模型参数n、哈勃常数h和，得到新agegraphic快子暗能量模型标量场势能和快子场的演化。

Abstract: New agegraphic dark energy model is proposed based on the gravitational effect in general relativity together with the uncertainty relation of quantum mechanics. As one among candidates for dark energy, dynamical scalar field model can be viewed as an effective description of the underlying theory of dark energy. We reconstruct a scalar field to describe the cosmological evolution of the new agegraphic dark energy through the correspondence relationship be-tween new agegraphic dark energy and scalar field like tachyon field. In this paper, we reconstruct new agegraphic tachyon dark energy model, in a flat universe with dark energy, matter and radiation. Subsequently, we obtain the dy-namical evolution of the tachyon potential V and the tachyon scalar field z by the best-fit parameters: model parameter n, the Hubble parameter h and constrained by the latest observational data.