http://arxiv.org/abs/1907.09897
Type Ia supernovae (SNe Ia) are among preeminent distance ladders for precision cosmology due to their intrinsic brightness, which allows them to be observable at high redshifts. Their usefulness as unbiased estimators of cosmological distances crucially depends on accurate understanding of their intrinsic brightness. This knowledge is based on calibrating their distances with Cepheids. Gravitational waves from compact binary coalescences, being standard sirens, can be used to validate distances to SNe Ia, when both occur in the same galaxy or galaxy cluster. The current measurement of distances by the advanced LIGO and Virgo detector network suffers from large statistical errors ($\sim 50\%$). However, we find that using a third generation gravitational-wave detector network, standard sirens will allow us to measure distances with an accuracy of $\sim 0.1\%$-$3\%$ for sources within $\le300$ Mpc. These are much smaller than the dominant systematic error of $\sim 5\%$ due to radial peculiar velocity of host galaxies. Therefore, gravitational-wave observations could soon add a new cosmic distance ladder for an independent calibration of distances to SNe Ia.
A. Gupta, D. Fox, B. Sathyaprakash, et. al.
Wed, 24 Jul 19
49/60
Comments: 13 pages, 11 figures
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