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arXiv 0901.0918astro-ph.COgr-qc
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引力增长框架的扩展

Extending the Gravitational Growth Framework

Eric V. Linder

摘要:

引力增长指数形式主义提供了一种独立于模型的方法,通过测试暗能量物理学来寻找与广义相对论的偏差,而不是它对宇宙膨胀历史的影响。在这里,我们扩展的方法,以纳入一个早期的时间参数g_star,除了在描述大尺度结构的增长指数。我们说明了它的效用模型与修改后的重力在高红移,早期加速,或早期暗能量。未来的数据将有能力同时约束暗能量状态方程、生长指数γ和g_star,而不会降低状态方程的确定性。

英文摘要:

The gravitational growth index formalism provides a model independent way to look for deviations from general relativity by testing dark energy physics distinct from its effects on the cosmic expansion history. Here we extend the approach to incorporate an early time parameter g_star in addition to the growth index in describing the growth of large scale structure. We illustrate its utility for models with modified gravity at high redshift, early acceleration, or early dark energy. Future data will have the capability to constrain the dark energy equation of state, the growth index gamma, and g_star simultaneously, with no degradation in the equation of state determination.

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