卢西亚诺-萨里达基斯全息暗能量的观测约束
Observational constraints on Luciano-Saridakis holographic dark energy
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中文总结 AI 辅助
本研究通过多种观测数据约束广义熵衍生的扩展全息暗能量模型，发现其对数据拟合良好，接近ΛCDM，且简化单贡献版本描述数据与完整版本基本等价，该模型是标准宇宙学的可行扩展。
中文摘要 AI 辅助
全息暗能量（HDE）模型为将引力热力学与宇宙晚期加速膨胀联系起来提供了自然框架。本研究探讨了由近期提出的广义熵衍生的扩展HDE场景的观测可行性。对于有界系统，该熵呈现出带有两个独立面积贡献的广义全息标度，产生了包含标准HDE和ΛCDM作为极限情况的修正HDE密度。聚焦于哈勃视界红外截断，我们利用宇宙计时仪、Pantheon⁺+SH0ES Ia型超新星汇编、DESI DR2重子声学振荡以及压缩的Planck 2018 CMB位移参数对该模型进行约束。研究发现，该模型对组合数据集提供了极佳拟合，且存在可同时容纳Pantheon⁺+SH0ES和CMB约束的参数空间区域。优选解接近ΛCDM regime，尽管非标准熵贡献仍与当前观测兼容。我们进一步将包含两个独立面积贡献的模型完整实现与其简化的单贡献极限进行比较，发现两者对数据的描述基本等价，且略微偏好后者。我们的结果确立了广义熵HDE作为标准宇宙学场景的可行且具理论动机的扩展，并提供了对该宇宙学框架的首次观测评估。
英文摘要
Holographic dark energy (HDE) models provide a natural framework for linking gravitational thermodynamics to the late-time accelerated expansion of the Universe. In this work, we investigate the observational viability of an extended HDE scenario arising from a recently proposed generalized entropy. For bounded systems, this entropy exhibits a generalized holographic scaling with two independent area contributions, giving rise to a modified HDE density that encompasses both standard HDE and $Λ$CDM as limiting cases. Focusing on the Hubble-horizon infrared cutoff, we constrain the model using Cosmic Chronometers, the Pantheon$^+$+SH0ES Type Ia supernova compilation, DESI DR2 baryon acoustic oscillations, and compressed Planck 2018 CMB shift parameters. We find that the model provides an excellent fit to the combined dataset and admits regions of parameter space in which the Pantheon$^+$+SH0ES and CMB constraints can be simultaneously accommodated. The preferred solutions lie close to the $Λ$CDM regime, although non-standard entropic contributions remain compatible with current observations. We further compare the complete realization of the model, containing both independent area contributions, with its reduced single-contribution limit, finding that both provide essentially equivalent descriptions of the data, with a mild preference for the latter. Our results establish generalized entropic HDE as a viable and theoretically motivated extension of the standard cosmological scenario and provide the first observational assessment of this cosmological framework.
发表机构
- Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales（布宜诺斯艾利斯大学，理学院）
- CONICET - Universidad de Buenos Aires, Instituto de Física de Buenos Aires (IFIBA)（阿根廷国家科学研究委员会-布宜诺斯艾利斯大学，布宜诺斯艾利斯物理研究所）
- Universidad de Lleida（莱里达大学）
- National Observatory of Athens（雅典国家天文台）
- National Technical University of Athens（雅典国立技术大学）
- Universidad Católica del Norte（北天主教大学）
- University of Science and Technology of China（中国科学技术大学）
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