Black Holes 'Weigh' the Expansion Rate of the Universe ⚡ экспресс
Original: "Mind the peak: improving cosmological constraints from GWTC-4.0 spectral sirens using semiparametric mass models"
Three characteristic masses of merging black holes allowed a more precise measurement of the universe's expansion rate.
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Black holes don't fall into the cosmic web by chance: they have favorite sizes — 10, 18, and 33 solar masses. From these 'notes,' we can hear how fast the universe is expanding, and even make out dark energy.
🎯 The lightest peak — 10 solar masses — is born from the collapse of an ordinary star. Black holes of 33 solar masses were considered a rarity, but now they are found more and more often, and they indeed set a powerful note in the symphony of mergers.
v = H_0 d
The speed at which a galaxy recedes (v) is related to its distance (d) through the universe's expansion rate (H₀). It was precisely this that was refined using black holes.