We put forward a pressure-parametric model to study the tiny deviation from cosmological constant(CC) behavior of the dark sector accelerating the expansion of the Universe. Data from cosmic microwave background (CMB) anisotropies, baryonic acoustic oscillations (BAO), Type Ia supernovae (SN Ia) observation are applied to constrict the model parameters. The constraint results show that such model suffers with [Formula: see text] tension as well. To realize this model more physically, we reconstruct it with the quintessence and phantom scalar fields, and find out that although the model predicts a quintessence-induced acceleration of the Universe at past and present, at some moment of the future, dark energy’s density have a disposition to increase.

中文翻译：

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一种新的压力参数宇宙学模型

我们提出了一个压力参数模型来研究暗区加速宇宙膨胀的宇宙常数（CC）行为的微小偏差。应用来自宇宙微波背景 (CMB) 各向异性、重子声学振荡 (BAO)、Ia 型超新星 (SN Ia) 观测的数据来限制模型参数。约束结果表明，这种模型也受到[公式：见文本]的紧张。为了更物理地实现这个模型，我们用精髓和幻象标量场对其进行重构，并发现尽管该模型预测了过去和现在的精髓引起的宇宙加速，但在未来的某个时刻，暗能量的密度已经增加的倾向。