Non-minimal quintessence with nearly flat potential
Non-minimal quintessence with nearly flat potential
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DOI：
10.1088/1475-7516/2009/09/027
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发表时间：
2009-01
影响因子：
6.4
通讯作者：
Anjan A. Sen;Gaveshna Gupta;Sudipta Das
中科院分区：
文献类型：
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作者：
Anjan A. Sen;Gaveshna Gupta;Sudipta Das
我们考虑Brans-Dicke型非最小耦合标量场作为暗能量的候选者。在共形变换的爱因斯坦坐标系中，我们的模型是一个耦合的精粹模型。在这样的模型中，我们考虑标量场的势满足慢滚条件：[（1/V）（dV/d）]2 << 1和（1/V）（d2 V/d2）<< 1。对于这样的潜力，我们表明，标量场的状态方程可以描述的一个普遍的行为，提供标量场卷只在平坦的部分的潜力，其中慢卷条件得到满足。我们的工作推广了Scherrer和Sen [7]关于最小耦合标量场的工作。我们还研究了超新星和BAO观测数据对模型参数的观测约束。
We consider Brans-Dicke type nonminimally coupled scalar field as a candidate for dark energy. In the conformally transformed Einstein's frame, our model is a coupled quintessence model. In such models, we consider potentials for the scalar field which satisfy the slow-roll conditions: [(1/V)(dV/d)]2 << 1 and (1/V)(d2V/d2) << 1. For such potentials, we show that the equation of state for the scalar field can be described by a universal behaviour, provided the scalar field rolls only in the flat part of the potentials where the slow-roll conditions are satisfied. Our work generalizes the previous work by Scherrer and Sen [7] for minimally coupled scalar field case. We have also studied the observational constraints on the model parameters considering the Supernova and BAO observational data.