Nanogravus: Pulsar Timing Arrays and Gravitational Waves

This chapter explores the utilization of pulsar timing arrays by nanogravus to detect gravitational waves, comparing their function to LIGO and highlighting their ability to detect small deviations induced by gravitational waves across galactic scales. It delves into the recent announcement by NanoGRAV regarding evidence for a gravitational wave background, discussing the challenges in isolating individual signals from supermassive black hole mergers due to the multitude of sources and slow evolution at low frequencies.