Distinguishing modified gravity models
Distinguishing modified gravity models
复制标题
区分修正的重力模型
DOI：
--
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
A. Davis
中科院分区：
文献类型：
--
作者：
P. Brax;A. Davis
在当地环境中进行筛选的修正重力模型出现在三种不同的伪装：变色龙，K-mouflage和Vainshtein机制。我们建议通过考虑低红移的宇宙学观测来寻找这几类模型之间的差异。特别是，我们分析的精细结构常数和质子电子质量比在这些情况下的红移依赖。当吸收线属于未屏蔽的空间区域，如矮星系时，变色龙会出现时间变化。对于K-莫夫拉和Vainshtein机制，标量场的宇宙学时间变化在非屏蔽和屏蔽环境中都没有被抑制，从而增强了常数的变化及其探测的前景。我们还考虑了遥远天体的红移随时间的变化，使用它们的光谱速度。我们发现K-mouflage和Vainshtein类型的模型具有非常不同的光谱速度作为红移的函数，并且它们与Λ-CDM模板的差异应该在未来ELT-HIRES观测的范围内。
Modified gravity models with screening in local environments appear in three different guises: chameleon, K-mouflage and Vainshtein mechanisms. We propose to look for differences between these classes of models by considering cosmological observations at low redshift. In particular, we analyse the redshift dependence of the fine structure constant and the proton to electron mass ratio in each of these scenarios. When the absorption lines belong to unscreened regions of space such as dwarf galaxies, a time variation would be present for chameleons. For both K-mouflage and Vainshtein mechanisms, the cosmological time variation of the scalar field is not suppressed in both unscreened and screened environments, therefore enhancing the variation of constants and their detection prospect. We also consider the time variation of the redshift of distant objects using their spectrocopic velocities. We find that models of the K-mouflage and Vainshtein types have very different spectroscopic velocities as a function of redshift and that their differences with the Λ-CDM template should be within reach of the future ELT-HIRES observations.
E-ELT 员工的社区科学案例
DOI：
10.48550/arxiv.1310.3163
发表时间：
2013
期刊：
arXiv e-prints
影响因子：
--
作者：
Maiolino R.
通讯作者：
Maiolino R.
影响因子：
5
作者：
Brax, Philippe;van de Bruck, Carsten;Shaw, Douglas
通讯作者：
Shaw, Douglas