Constraining modified theories of gravity with the galaxy bispectrum
Constraining modified theories of gravity with the galaxy bispectrum
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DOI：
10.1103/physrevd.96.123516
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发表时间：
2017-09
影响因子：
5
通讯作者：
Daisuke Yamauchi;Shuichiro Yokoyama;H. Tashiro
中科院分区：
文献类型：
--
作者：
Daisuke Yamauchi;Shuichiro Yokoyama;H. Tashiro
我们探索使用由非线性引力演化引起的星系双谱作为可能的探针来测试具有二阶运动方程的一般标量张量理论。我们发现，领先的二阶内核的时间依赖性近似地由一个参数（二阶指数）来表征，该参数有望追踪宇宙的高阶增长历史。我们表明，我们的新参数可以显着携带有关结构非线性增长的新信息。我们预测了二阶指数以及状态方程参数和增长指数的未来约束。
We explore the use of galaxy bispectrum induced by the nonlinear gravitational evolution as a possible probe to test general scalar-tensor theories with second-order equations of motion. We find that time dependence of the leading second-order kernel is approximately characterized by one parameter, the second-order index, which is expected to trace the higher-order growth history of the Universe. We show that our new parameter can significantly carry new information about the non-linear growth of structure. We forecast future constraints on the second-order index as well as the equation-of-state parameter and the growth index.