'Spectral siren' method suggests mergers between massive and compact cosmic objects could help understand how the universe has evolved.
. Dark energy makes up about 68% of the matter and energy content of the universe, and scientists want to determine when this mysterious force began to rule over matter and why this switch occurred.
, the Italian observatory Virgo and Japan's Kamioka Gravitational Wave Detector , can measure these faint gravitational wave signals. The new spectral siren method suggests that gravitational wave signals may encode other information as well. Specifically, as these ripples in spacetime travel across tremendous distances and over long timescales to reach Earth, the properties of their signals are changed by the expansion of the universe.
"So we measure the masses of the nearby black holes and understand their features, and then we look further away and see how much those further ones appear to have shifted," Jose María Ezquiaga, co-author and an astrophysicist also at the University of Chicago, said in the statement."And this gives you a measure of the expansion of the universe.", detecting these ripples from more distant black hole mergers lets scientists look back in time.
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