具有近乎平坦电位的融化精华
Thawing quintessence with a nearly flat potential
摘要：
具有几乎平坦的电势的解冻精髓模型提供了产生状态方程参数w的自然机制，该状态方程参数w在今天接近-1。我们在势满足慢滚条件：[（1/V）（dV/dphi）]^2 << 1和（1/V）（d^2 V/dphi ^2）<< 1的情况下考察了这种模型的行为，并在物质和标量场都对密度有贡献的情况下推导出类似的慢滚近似。我们表明，在这个极限，所有这样的模型收敛到一个唯一的关系1+w，Ω_phi，和初始值（1/V）（dV/dphi）。我们推导出这个关系式，并用它来确定w（a）的相应表达式，它只取决于w和Ω_phi的当前值。对于各种电位，我们对w（a）的极限表达式通常精确到δ w < 0.005（对于w<-0.9）。对于红移z < 1，w（a）可以用Chevallier-Polarski-Linder参数化很好地拟合，其中w（a）是a的线性函数。
英文摘要：
The thawing quintessence model with a nearly flat potential provides a natural mechanism to produce an equation of state parameter, w, close to -1 today. We examine the behavior of such models for the case in which the potential satisfies the slow roll conditions: [(1/V)(dV/dphi)]^2 << 1 and (1/V)(d^2 V/dphi^2) << 1, and we derive the analog of the slow-roll approximation for the case in which both matter and a scalar field contribute to the density. We show that in this limit, all such models converge to a unique relation between 1+w, Omega_phi, and the initial value of (1/V)(dV/dphi). We derive this relation, and use it to determine the corresponding expression for w(a), which depends only on the present-day values for w and Omega_phi. For a variety of potentials, our limiting expression for w(a) is typically accurate to within delta w < 0.005 for w<-0.9. For redshift z < 1, w(a) is well-fit by the Chevallier-Polarski-Linder parametrization, in which w(a) is a linear function of a.
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