Forecast constraints on anisotropic stress in dark energy using gravitational waves. Issue 1 (2nd July 2020)

• Record Type: Journal Article
• Authors: Yang, Weiqiang; Pan, Supriya; Mota, David F; Du, Minghui
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 497:Issue 1(2020)
• Page Start: 879
• Page End: 893
• Publication Date: 2020-07-02
• Subjects: cosmological parameters -- dark energy -- dark matter -- large-scale structure of Universe; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/staa1859
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: It is always interesting to investigate how well can a future experiment perform with respect to others (present or future ones). Cosmology is really an exciting field where a lot of puzzles are still unknown. In this paper, we consider a generalized dark energy (DE) scenario where anisotropic stress is present. We constrain this generalized cosmic scenario with an aim to investigate how gravitational waves standard sirens (GWSS) may constrain the anisotropic stress, which, according to the standard cosmological probes, remains unconstrained. In order to do this, we generate the luminosity distance measurements from $\mathcal {O} (10^3)$ mock GW events that match the expected sensitivity of the Einstein Telescope. Our analyses report that, first of all, GWSS can give better constraints on various cosmological parameters compared to the usual cosmological probes, but the viscous sound speed appearing due to the DE anisotropic stress is totally unconstrained even after the inclusion of GWSS.