Constraining modified theory of gravity with galaxy bispectrum
Cosmology and Nongalactic Astrophysics
2017-12-20 v1
Abstract
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.
Cite
@article{arxiv.1709.03243,
title = {Constraining modified theory of gravity with galaxy bispectrum},
author = {Daisuke Yamauchi and Shuichiro Yokoyama and Hiroyuki Tashiro},
journal= {arXiv preprint arXiv:1709.03243},
year = {2017}
}
Comments
15 pages, 2 figures