arXiv 2603.154222026-03astro-ph.COgr-qc

当单参数暗能量使中微子再次成为物理粒子

When One-Parameter Dark Energy Makes Neutrinos Physical Again

Liaoning Normal University（辽宁师范大学）；University of Sheffield（谢菲尔德大学）；University of California, Berkeley（加州大学伯克利分校）；Presidency University（总统大学）；Durban University of Technology（德班理工大学）

Weiqiang Yang, Eleonora Di Valentino, Eric V. Linder, Sibo Zhang, Supriya Pan

备注：: Approximately 12 pages including references, 7 tables and 4 figures; version published in Phys. Rev. D
发表信息：: Phys.Rev.D 114 (2026) 6, 063515
DOI：: 10.1103/41tc-5ffp

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AI总结：

研究通过单参数暗能量模型恢复中微子质量正值，发现某些模型足以满足数据需求，表明数据指向特定物理特性而非广义退化。

摘要：

当前数据在ΛCDM宇宙学中暗示中微子质量总和为负值。转向w0waCDM模型可使中微子质量后验恢复为正值，而常数方程状态暗能量模型wCDM无法实现。本文研究了多种单参数暗能量方程状态（DE EoS），每种模型具有特定物理性质，以确定是否需要双参数DE EoS来使中微子质量为正。结论是某些单参数DE EoS足以满足需求，表明数据指向特定物理特性而非广义退化。所需特性为高红移时的虚粒子暗能量，于低红移时穿越w=-1。

英文摘要：

A puzzling implication of current data interpreted in the $Λ$-Cold Dark Matter cosmology is the preference for a negative sum of neutrino masses. Moving to $w_0w_a$CDM brings an appreciable fraction of the neutrino mass posterior back to positive values, while the constant equation-of-state dark energy case $w$CDM does not. We investigate a variety of one-parameter dynamical dark energy equations of state (DE EoS) whose redshift evolution is controlled by a single free parameter, each representing distinct physical properties, to understand whether a two-parameter DE EoS is required to bring the neutrino mass into the positive region. The conclusion is that certain one-parameter DE EoS can suffice, implying that the data are pointing toward physical characteristics rather than a broad degeneracy. This behavior effectively lowers the dark energy density at high redshift, allowing the sum of neutrino masses to shift toward the physical region. The required characteristics are identified as phantom dark energy at high redshift, crossing $w=-1$ at lower redshift.

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