Author(s): David Wright, Kalista Wayt, Jeffrey S. Hazboun, Xavier Siemens, Rutger van Haasteren, Levi Schult, and Stephen R. Taylor In 2023, after more than two decades of searching, pulsar timing array (PTA) collaborations around the world announced evidence for a stochastic gravitational wave background. It was quickly followed by work from the International Pulsar Timing Array (IPTA), demonstrating that the results of regiona… [Phys. Rev. Lett. 137, 041402] Published Tue Jul 21, 2026