中文

曲率调制耦合 quintessence 场景中结构生长的综合动力学与现象学分析

广义相对论与量子宇宙学 2025-10-28 v3 宇宙学与河外天体物理

摘要

我们研究了以 quintessence 框架描述的相互作用暗能量-暗物质模型, characterized by 耦合项 Q0=ακρmϕ˙[1βR/(6H2)]Q_0 = \alpha \kappa \rho_m \dot{\phi} \left[1 - \beta R/(6H^2) \right],其中标量场在指数势 V(ϕ)=V0eλκϕV(\phi) = V_0 e^{-\lambda \kappa \phi} 下演化,参数为 α\alpha, λ\lambdaβ\beta。我们将宇宙方程重构为一阶自治系统,using dimensionless variables, we perform phase space analysis to identify conditions for stable, non-phantom accelerating attractors. The Ricci scalar term, controlled by β\beta, significantly affects the stability of critical points, with attractors transitioning to repellers for higher values of β\beta. 我们还分析了线性标量扰动,关注物质密度对比 δm\delta_m 和增长指数 γ\gamma。此外,我们计算了减速参数和抖率参数、哈勃速率以及距离模数 μ(z)\mu(z),显示与观测数据良好一致。该模型通过标量场跟踪行为自然解决了宇宙常数问题。对于适度的参数值,物质扰动继续向未来生长,有效地捕获了背景和扰动动力学。这一框架因此提供了一个一致且具有观测可行性的相互作用暗能量方法。

关键词

引用

@article{arxiv.2507.09169,
  title  = {A comprehensive dynamical and phenomenological analysis of structure growth in curvature-modulated coupled quintessence scenario},
  author = {Anirban Chatterjee and Yungui Gong},
  journal= {arXiv preprint arXiv:2507.09169},
  year   = {2025}
}

备注

31 pages, 12 figures and 2 tables. Latest version has been accepted for publication in ` Physics of the Dark Universe'