期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 908, 期 1, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/2041-8213/abdab0
关键词
Gravitational waves; Cosmological parameters; Neutron stars
资金
- Black Hole Initiative at Harvard University, through the John Templeton Foundation
- Gordon and Betty Moore Foundation
- NASA through the NASA Hubble Fellowship - Space Telescope Science Institute [HST-HF2-51452.001-A, HST-HF2-51404.001-A]
- NASA [NAS 5-26555, NNX17AK43G]
- NSF [AST-2002577]
The combination of gravitational-wave data with redshift measurements can constrain cosmological parameters. The future era of GW observatories such as A+, Voyager, and Cosmic Explorer will bring prospects for multimessenger cosmology, with different detectors offering varying levels of precision and effects at different stages.
The most promising variation of the standard siren technique combines gravitational-wave (GW) data for binary neutron star (BNS) mergers with redshift measurements enabled by their electromagnetic (EM) counterparts, to constrain cosmological parameters such as H-0, omega(m), and w(0). Here we evaluate the near- and long-term prospects of multimessenger cosmology in the era of future GW observatories: Advanced LIGO Plus (A+, 2025), Voyager-like detectors (2030s), and Cosmic Explorer-like detectors (2035 and beyond). We show that the BNS horizon distance of 700 Mpc for A+ is well matched to the sensitivity of the Vera C. Rubin Observatory (VRO) for kilonova detections. We find that one year of joint A+ and VRO observations will constrain the value of H-0 to percent-level precision, given a small investment of VRO time dedicated to target-of-opportunity GW follow-up. In the Voyager era, the BNS-kilonova observations begin to constrain omega(m) with an investment of a few percent of VRO time. With the larger BNS horizon distance in the Cosmic Explorer era, on-axis short gamma-ray bursts (SGRBs) and their afterglows (though accompanying only some of the GW-detected mergers) supplant kilonovae as the most promising counterparts for redshift identification. We show that five years of joint observations with Cosmic Explorer-like facilities and a next-generation gamma-ray satellite with localization capabilities similar to that presently possible with Swift could constrain both omega(m) and w(0) to 15%-20%. We therefore advocate for a robust target-of-opportunity (ToO) program with VRO, and a wide-field gamma-ray satellite with improved sensitivity in the 2030s, to enable standard siren cosmology with next-generation gravitational-wave facilities.
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