多场暗能量中的宇宙学微扰与聚集机制
Cosmological perturbations and clustering mechanisms in multifield dark energy
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中文总结 AI 辅助
研究具有弯曲场空间几何的双场暗能量的宇宙学特征，通过数值求解方程评估有效单场描述有效性，考察三种暗能量聚集机制及其在物质功率谱等上的印记，确立多场暗能量为可检验的Quintessence扩展。
中文摘要 AI 辅助
我们研究具有弯曲场空间几何的双场暗能量的宇宙学特征。通过数值求解背景和线性微扰方程来评估有效单场描述的有效性。考察三种不同的暗能量聚集机制：有效声速抑制、重模式的动力学激发以及场空间曲率引起的快子不稳定性，并探究它们在物质功率谱和宇宙微波背景各向异性上可能的印记。我们的分析确立了多场暗能量是一种丰富且可检验的 Quintessence 扩展，其可观测的聚集特征与当前和未来的宇宙学勘测相关。
英文摘要
We investigate the cosmological signatures of two-field dark energy with curved field-space geometry. We numerically solve the background and linear perturbation equations and assess the validity of the effective single-field description. We examine three distinct dark-energy clustering mechanisms: effective sound-speed suppression, dynamical excitation of the heavy mode, and tachyonic instabilities induced by field-space curvature, and explore their possible imprints on the matter power spectrum and cosmic microwave background anisotropies. Our analysis establishes multifield dark energy as a rich and testable extension of quintessence, with observable clustering signatures relevant to current and future cosmological surveys.
