The NANOGrav 15 yr Data Set: Looking for Signs of Discreteness in the
Gravitational-wave Background
The NANOGrav 15 yr Data Set: Looking for Signs of Discreteness in the
Gravitational-wave Background
The cosmic merger history of supermassive black hole binaries (SMBHBs) is expected to produce a low-frequency gravitational wave background (GWB). Here we investigate how signs of the discrete nature of this GWB can manifest in pulsar timing arrays through excursions from, and breaks in, the expected $f_{\mathrm{GW}}^{-2/3}$ power-law of the …