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arXiv 2607.16395astro-ph.COgr-qc

滚动伽利略子:为可行暗能量演化编织强度

Rolling Galileons: Evolving Braiding Strength for Viable Dark Energy

  • Institute of Cosmology and Gravitation, University of Portsmouth(朴茨茅斯大学宇宙学与引力研究所)
  • Max-Planck-Institut für Astronomie(马克斯·普朗克天文学研究所)

机构由 AI 辅助整理,请以论文原文为准。

James Hallam, Krishna Naidoo, Sergi Sirera, Tessa Baker

AI总结:

受暗能量动态性观测迹象启发,引入滚动伽利略引力,其耦合系数可变产生演化编织强度。推导满足三个现象学要求的条件,贝叶斯分析表明最小模型能满足要求并拟合膨胀历史数据。

AI中文摘要:

受暗能量可能是动态的这一日益增多的观测迹象的推动,我们引入了滚动伽利略引力:立方伽利略子的一种最小破移对称性扩展,其中耦合系数允许变化,从而产生不断演化的编织强度。完整的理论空间在场重定义下是封闭的,由两个函数表征。我们推导了满足三个现象学要求的解析条件:i)晚期的幻像穿越状态方程,ii)正的积分萨克斯 - 沃尔夫特征,以及iii)宇宙空洞中屏蔽标量力不存在病态。我们表明,相对于动能部分,不断增加的编织强度共同满足了这些条件。对最小滚动伽利略子模型的贝叶斯分析发现,它们可以满足可行性要求i) - iii),同时对膨胀历史数据提供可接受的拟合。

英文摘要:

Motivated by growing observational indications that dark energy may be dynamical, we introduce Rolling Galileon gravity: a minimal shift-symmetry-breaking extension of the cubic Galileon in which the coupling coefficients are allowed to vary, giving rise to an evolving braiding strength. The full theory space, shown to be closed under field redefinitions, is characterised by two functions. We derive analytical conditions to satisfy three phenomenological requirements: i) a phantom-crossing equation of state at late times, ii) a positive integrated Sachs-Wolfe signature, and iii) absence of pathologies in the screened scalar force in cosmic voids. We show that these conditions are collectively satisfied by an increasing braiding strength relative to the kinetic sector. A Bayesian analysis of minimal Rolling Galileon models finds that they can satisfy the viability requirements i)-iii) whilst providing an acceptable fit to expansion-history data.

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