经典α吸引子模型更新版
Quintessential α-attractors, updated
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中文总结 AI 辅助
本文更新经典α吸引子模型，使其单一场可描述暴胀与演化暗能量，适配暗辐射约束与ACT偏好的高ns值，还研究了适配DESI DR2的幻影假象型模型。
中文摘要 AI 辅助
单场暴胀与演化暗能量的经典α吸引子模型构建于约十年前。近期研究指出，其中部分模型可能因引力波的暗辐射约束及ACT所偏好的较高标量谱指数ns而不受青睐。本文提出一类更新后的经典α吸引子模型，其单一场同时描述暴胀与演化暗能量，能产生较高的ns值，且存在与暗辐射对ΔNeff的约束相符的重加热场景。依据宇宙学常数Λ的取值，这些模型可在Λ>0的ΛCDM模型（未来德西特宇宙）、Λ=0的动力学暗能量模型（未来闵可夫斯基宇宙）及Λ<0的动力学暗能量模型（未来宇宙坍缩）之间插值。本文还研究了基于具有双曲几何的轴子-暴胀子复标量场的经典α吸引子模型，其描述与DESI DR2兼容的“幻影假象”型暴胀与暗能量。
英文摘要
Quintessential $α$-attractor models of single-field inflation and evolving dark energy were constructed about a decade ago. Recently, it was pointed out that some of them might be disfavored due to dark-radiation constraints on gravitational waves and the higher values of $n_s$ favored by ACT. Here we present a class of updated quintessential $α$-attractor models in which a single field describes both inflation and evolving dark energy, yields higher values of $n_s$, and admits reheating scenarios consistent with the dark-radiation bound on $ΔN_{\rm eff}$. Depending on the value of the cosmological constant $Λ$, these models interpolate between $Λ$CDM with $Λ> 0$ (future dS universe), dynamical dark energy with $Λ= 0$ (future Minkowski universe), and dynamical dark energy with $Λ< 0$ (future cosmological collapse). We also study quintessential $α$-attractor models based on an axion-inflaton complex scalar field with hyperbolic geometry, which describe inflation and dark energy of a ``phantom illusion'' type compatible with DESI DR2.
