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arXiv 1306.4662astro-ph.COgr-qchep-th
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拐点精华

Inflection Point Quintessence

Hui-Yiing Chang, Robert J. Scherrer

摘要:

我们研究的模型中,宇宙的加速膨胀是由一个标量场滚动附近的拐点的潜力。对于最简单的这种模型,其中势的形式为V(λ)= V_0 + V_3(λ-λ_0)^[3],标量场要么在后期向λ = λ_0演化,产生渐近的德西特展开,要么通过拐点过渡,产生一个瞬时的加速期。我们确定的参数范围,产生这两种可能性,也映射出的区域在参数空间中的状态方程的标量场是接近-1的所有时间到目前为止,模仿\LambdaCDM。我们表明,后者可以是一致的永恒或瞬态加速度。更复杂的拐点模型也进行了研究。

英文摘要:

We examine models in which the accelerated expansion of the universe is driven by a scalar field rolling near an inflection point in the potential. For the simplest such models, in which the potential is of the form V(ϕ) = V_0 + V_3 (ϕ-ϕ_0)^3, the scalar field can either evolve toward ϕ= ϕ_0 at late times, yielding an asymptotic de Sitter expansion, or it can transition through the inflection point, producing a transient period of acceleration. We determine the parameter ranges which produce each of these two possibilities and also map out the region in parameter space for which the equation of state of the scalar field is close to -1 at all times up to the present, mimicking \LambdaCDM. We show that the latter can be consistent with either eternal or transient acceleration. More complicated inflection point models are also investigated.

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