巴罗熵与QCD鬼机制结合的晚期宇宙加速模型
A Combined Barrow Entropy and QCD Ghost Mechanism for Late-Time Cosmic Acceleration
AI总结：
该研究提出一种结合巴罗熵修正和QCD鬼机制的暗能量模型，通过构建广义holographic形式的暗能量密度，实现从物质主导时期到晚期加速阶段的平滑过渡，并验证了其热力学可行性和稳定性。
摘要：
我们研究了一个基于巴罗熵修正和QCD鬼机制共同作用的统一暗能量场景，称为BH--QCDGDE模型。暗能量密度以广义 holographic 形式构建，结合了巴罗变形的熵修正和低能QCD真空效应。在空间平坦的Friedmann-Lema\^ıtre-Robertson-Walker背景中分析宇宙动力学。该模型从减速物质主导时期平滑过渡到晚期加速阶段，不跨越 phantom 分界线，表明了可行的背景演化。通过重构有效暗能量部分的等效标量场描述，显示其具有类似quintessence的行为。通过测试事件视界处的广义第二定律检验热力学可行性，发现其在整个参数空间内均被满足。通过研究平方声速的速度分析模型的经典稳定性，揭示了模型参数在塑造稳定宇宙学制度中的作用。总体而言，BH--QCDGDE框架提供了晚期宇宙加速的一致且物理上可行的描述。
英文摘要：
We investigate a unified dark-energy scenario based on the combined effects of Barrow entropy corrections and the QCD ghost mechanism, referred to as the BH--QCDGDE model. The dark-energy density is constructed in a generalized holographic form that incorporates both Barrow-deformed entropy corrections and low-energy QCD vacuum effects within a single framework. The cosmological dynamics are analyzed in a spatially flat Friedmann--Lema\^ıtre--Robertson--Walker background. The model exhibits a smooth transition from a decelerated matter-dominated era to a late-time accelerated phase without crossing the phantom divide, indicating a viable background evolution. An equivalent scalar-field description of the effective dark-energy sector is reconstructed and shown to admit a quintessence-like behavior. The thermodynamic viability is examined by testing the generalized second law at the apparent horizon, which is found to be satisfied throughout the parameter space. The classical stability of the model is further investigated through the squared speed of sound, revealing the role of model parameters in shaping stable cosmological regimes. Overall, the BH--QCDGDE framework provides a consistent and physically viable description of late-time cosmic acceleration.
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