Work

Redshift-space distortion from dynamical dark energy with time-dependent Lagrangian perturbation theory

Year: 2018

Type: article

Abstract: We apply the Lagrangian perturbation theory with time-dependent growth functions at second and third order of perturbation with the aim to model the effect of dynamical dark energy on redshift-space distortions. Our fiducial galaxy redshift surveys are modeled after the upcoming SKA and DESI redshift surveys. We include PLANCK CMB priors and the 20% uncertainty on the linear bias parameter, incorporating the unknown instrumentation noise. After the marginalizing, our results show that the constraints on the density parameter could potentially get better than $\ensuremath{\sim}1%$, while the constraints on ${w}_{0}$ and ${w}_{\mathrm{a}}$ could be better than $\ensuremath{\sim}5%$ and $\ensuremath{\sim}60%$, respectively, consistent with works done before. However, the inclusion of time-dependent growth functions would alter the nonlinear power spectrum by as much as $\ensuremath{\sim}10%$. The inclusion of the time-dependent growth functions become crucial as the precision gets better.

Source: Physical review. D/Physical review. D.

DOI: 10.1103/physrevd.98.083534

Authors: Chakkrit Kaeonikhom, Teeraparb Chantavat

Institutions: Chiang Mai Rajabhat University, Thailand Center of Excellence in Physics, Ministry of Education, Naresuan University

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funder: Thailand Research Fund

Award: G6427121570