Will Gravitational Wave Sirens Determine the Hubble Constant?

Abstract

Lack of knowledge about the background expansion history of the Universe from independent observations makes it problematic to obtain a precise and accurate estimation of the Hubble constant $H_0$ from gravitational wave standard sirens, even with electromagnetic counterpart redshifts. Simply fitting simultaneously for the matter density in a flat \lcdm\ model can reduce the precision on $H_0$ from 1\% to 5\%, while not knowing the actual background expansion model of the universe (e.g.\ form of dark energy) can introduce substantial bias in estimation of the Hubble constant. When the statistical precision is at the level of 1\% uncertainty on $H_0$, biases in non-\lcdm\ cosmologies that are consistent with current data could reach the 3$\sigma$ level. To avoid model-dependent biases, statistical techniques that are appropriately agnostic about model assumptions need to be employed.

7 pages, 7 figures

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Cited by in corpus (6)

• A statistical standard siren measurement of the Hubble constant from the LIGO/Virgo gravitational wave compact object merger GW190814 and Dark Energy Survey galaxies
• Probing gravity and growth of structure with gravitational waves and galaxies' peculiar velocity
• The Hubble constant tension with next-generation galaxy surveys
• Forecast constraints on Anisotropic Stress in Dark Energy using gravitational-waves
• Exploring the potentiality of standard sirens to probe cosmic opacity at high redshifts
• Detection of Unresolved Strongly Lensed Supernovae with 7-Dimensional Telescope