2017/09/11 by Daisuke Yamauchi, Shuichiro Yokoyama, Hiroyuki Tashiro · 1 citation
Mathematics · Physics and Astronomy · #Anisotropy #Bispectrum #Black Holes and Theoretical Physics #Classical mechanics #Computer science #Cosmic microwave background #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #Gravitation #Index (typography) #Mathematics #Non-Gaussianity #Nonlinear system #Physics #Quantum mechanics #Scalar (mathematics) #Spectral density #Statistical physics #Statistics #TRACE (psycholinguistics) #Tensor (intrinsic definition) #Theoretical physics #Trispectrum #astro-ph.CO
paper · pdf · doi:10.1103/physrevd.96.123516
published as Phys. Rev. D 96, 123516 (2017) · 15 pages, 2 figures
arxiv created 2017/09/11 · openalex created_date 2017/09/25 · openalex publication_date 2017/12/14 · arxiv updated 2017/12/20 · openalex updated_date 2026/08/05
We explore the use of the 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 nonlinear growth of structure. We forecast future constraints on the second-order index as well as the equation-of-state parameter and the growth index.