PhD student Sarah Ferraiuolo presented a new study on how the stochastic gravitational-wave background can improve the measures of the Hubble parameter.

The individual gravitationa-wave (GW) sources that we see in our detectors are just the tip of the iceberg. Below them, thousands of silent GW sources compose the stochastic GW background (SGWB). In this paper, we demonstrate that the SGWB can be exploited, along with resolved sources,  to measure cosmological expansion parameters.  Its inclusion can help us to constrain cosmological models where the Universe is very old.

Please, feel free to read our paper and reach out to us for any question or suggestion.

Figure: Hubble parameter reconstructed from only resolved GW sources (pink) and with the stochastic GW background (blue).