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arXiv 1104.0415astro-ph.CO
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重力试验测量设计

Designing Surveys for Tests of Gravity

Bhuvnesh Jain

摘要:

修正后的引力理论可能会为解释宇宙加速提供暗能量的替代方案。我们认为,为测试暗能量而开发的观测计划需要扩大,以捕捉天体物理尺度上的引力新测试。引力理论的几个不同特征存在于线性区域之外,特别是由于在像银河系这样的晕内运行的屏蔽机制,以确保太阳系中的引力测试得到满足。这开辟了几十年的长度尺度和新的星系类别在低红移,可以利用调查。虽然引力模型的理论工作还处于早期阶段,但我们已经可以确定宇宙学调查可以用来测试引力的新机制。这些措施包括:1.一个小尺度的组成部分,重点是内部和附近的星系和星团晕。2.低红移星系的光谱,特别是比银河系小的星系,在从空洞到星系团的环境中。3.一个结合透镜和动力学信息的程序,分别来自成像和光谱调查,对同一个(或统计上相同的)星系样本。

英文摘要:

Modified gravity theories may provide an alternative to dark energy to explain cosmic acceleration. We argue that the observational program developed to test dark energy needs to be augmented to capture new tests of gravity on astrophysical scales. Several distinct signatures of gravity theories exist outside the linear regime, especially owing to the screening mechanism that operates inside halos like the Milky Way to ensure that gravity tests in the solar system are satisfied. This opens up several decades in length scale and new classes of galaxies at low-redshift that can be exploited by surveys. While theoretical work on models of gravity is in the early stages, we can already identify new regimes which cosmological surveys could target to test gravity. These include: 1. A small scale component that focuses on the interior and vicinity of galaxy and cluster halos. 2. Spectroscopy of low redshift galaxies, especially galaxies smaller than the Milky Way, in environments that range from voids to clusters. 3. A program of combining lensing and dynamical information, from imaging and spectroscopic surveys respectively, on the same (or statistically identical) sample of galaxies.

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