Assessing the viability of successful reconstruction of the dynamics of dark energy using varying fundamental couplings
Assessing the viability of successful reconstruction of the dynamics of dark energy using varying fundamental couplings
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DOI：
10.1016/j.physletb.2012.09.062
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发表时间：
2011-12
影响因子：
4.4
通讯作者：
P. Avelino;L. Losano;R. Menezes;J. Oliveira
中科院分区：
文献类型：
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作者：
P. Avelino;L. Losano;R. Menezes;J. Oliveira
我们评估的可行性，成功重建的暗能量状态方程的演变，使用不同的基本耦合，如精细结构常数或质子-电子质量比。我们发现，暗能量状态方程参数随宇宙时间的演化可能与基本耦合的任意变化有关。在信中研究了具有相同（不同）背景演化和不同（相同）基本耦合随时间变化的模型的各种示例。虽然我们证明，对于一个广泛的家庭的模型，它是可以重新定义的标量场，以这样一种方式，它的动态是一个标准的quintessence标量场，在一般情况下，这种重新定义导致崩溃的标量场和基本耦合的变化之间的线性关系。这意味着线性耦合的假设不足以保证暗能量动力学的成功重建，因此需要对暗能量的标量场进行额外的模型相关假设。
We assess the viability of successful reconstruction of the evolution of the dark energy equation of state using varying fundamental couplings, such as the fine structure constant or the proton-to-electron mass ratio. We show that the same evolution of the dark energy equation of state parameter with cosmic time may be associated with arbitrary variations of the fundamental couplings. Various examples of models with the same (different) background evolution and different (the same) time variation of fundamental couplings are studied in the Letter. Although we demonstrate that, for a broad family of models, it is possible to redefine the scalar field in such a way that its dynamics is that of a standard quintessence scalar field, in general such redefinition leads to the breakdown of the linear relation between the scalar field and the variation of fundamental couplings. This implies that the assumption of a linear coupling is not sufficient to guarantee a successful reconstruction of the dark energy dynamics and consequently additional model dependent assumptions about the scalar field responsible for the dark energy need to be made.