发表机构
Observatório Nacional; Instituto de Física, Universidade Federal da Bahia; PPGCosmo, Universidade Federal do Espírito Santo（国家天文台; 巴伊亚联邦大学物理研究所; 圣埃斯皮里图联邦大学宇宙学研究生项目）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
针对标准宇宙学模型可能不完整的问题，本文研究具有一般线性耦合的相互作用Λ模型，该模型允许暗能量密度从负变正，实现反德西特到德西特相变，并用超新星、BAO和CMB数据约束，为动态暗能量提供新见解。
AI 中文摘要
近期的宇宙学结果，包括持续的 $H_0$ 张力和动力学暗能量的迹象，提出了标准 $\Lambda$-冷暗物质（$\Lambda$CDM）模型可能不完整的可能性。与此同时，基于沼泽地猜想（swampland conjectures）的理论发展表明，在弦理论中实现稳定的德西特（de Sitter）真空是具有挑战性的。受这些观测和理论考虑的启发，我们研究了一个相互作用的 $\Lambda$ 情景，其特征是暗区中的一般线性耦合。在背景层面上，该模型自然地允许暗能量密度从负值演化为正值，从而开启了从反德西特（anti-de Sitter）样相到当前观测推断出的德西特样相转变的可能性。我们推导了解析背景解和扰动方程，讨论了参数空间中物理上可接受的区域，并用DES-Dovekie Ia型超新星、DESI BAO和CMB数据约束该模型。我们的分析表明，存在一个参数空间允许暗能量密度改变符号，同时保持正的暗物质密度，这激发了进一步研究相互作用驱动的反德西特到德西特转变。
英文摘要
Recent cosmological results, including the persistent $H_0$ tension and indications of dynamical dark energy, have raised the possibility that the standard $Λ$-Cold Dark Matter ($Λ$CDM) model may be incomplete. At the same time, theoretical developments based on swampland conjectures indicate that the realization of a stable de Sitter vacuum within string theory is challenging. Motivated by these observational and theoretical considerations, we investigate an interacting $Λ$ scenario characterized by a general linear coupling in the dark sector. At the background level, this model naturally allows the dark energy density to evolve from negative to positive values, opening the possibility of a transition from an anti-de Sitter-like phase to the de Sitter-like phase inferred by current observations. We derive the analytic background solutions and perturbation equations, discuss the physically acceptable region of parameter space, and constrain the model with DES-Dovekie type Ia supernovae, DESI BAO and CMB data. Our analysis suggests a parameter space allowing the dark energy density to change sign while maintaining positive dark matter density, motivating further investigation of an interaction-driven anti-de Sitter to de Sitter transition.
Comments9 pages, 4 figures, 2 tables, LaTex
