Are redshift-space distortions actually a probe of growth of structure?

PASJ: Publications of the Astronomical Society of Japan

Suyama, Teruaki¹  Yokoyama, Shuichiro²  Yamauchi, Daisuke³  Kimura, Rampei³  Yamaguchi, Masahide³ 

[1] Department of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan;Faculty of Engineering, Kanagawa University, Kanagawa-ku, Yokohama-shi, Kanagawa 221-8686, Japan;Waseda Institute for Advanced Study, Waseda University, 1-6-1 Nishi-Waseda, Shinjuku, Tokyo 169-8050, Japan

关键词: cosmology: observations;    cosmology: theory;    (cosmology:) dark matter;    (cosmology:) dark energy;    (cosmology:) large-scale structure of universe;   

DOI  :  10.1093/pasj/psy083

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

Although multiple cosmological observations indicate the existence of dark matter and dark energy, cosmological tests of interactions between them have not yet been established. We point out that, in the presence of a coupling between dark matter and dark energy, a peculiar velocity of total matter field is determined not only by a logarithmic time-derivative of its density perturbation but also by density perturbations for both dark matter and baryonic matter, leading to a large modification of the physical interpretation of observed data obtained by measurements of redshift-space distortions. We reformulate a galaxy two-point correlation function in the redshift space based on the modified continuity and Euler equations. We conclude from the resultant formula that redshift space distortions provide us information on the coupling between dark matter and the scalar field by combining weak lensing measurements.

【 授权许可】

CC BY