The IGC ApJL “Dark sirens to resolve the Hubble-Lemaître tension” was highlighted in AAS Nova.

Besides tests of GR, Gravitational Wave (GW) observations of compact binary mergers also play a unique role for cosmology: They facilitate the measurement of the Hubble constant through a luminosity distance estimate in combination with an independent, electromagnetic redshift measurement from the GW source’s host galaxy. In the light of the tension between the electromagnetic measurements of the Hubble constant from the early and late universe, the GW-assisted method has gained even more importance. While other studies have investigated methods to resolve the Hubble-Lemaître tension with binary neutron stars, IGC researchers Ssohrab Borhanian, Arnab Dhani, Anuradha Gupta, K.G. Arun and B.S. Sathyaprakash demonstrated that there is an observable population of golden dark sirens that could facilitate this resolution in the next five years without direct electromagnetic counterparts or statistical methods. Instead, improved waveform models using higher spherical harmonic modes and planned upgrades to GW detectors will compound together to localize these golden events with high-precision—in distance and on the sky—to uniquely determine their host galaxies in the local universe and consequently measure the Hubble constant to the required precision.”