Cosmic superstrings revisited in light of NANOGrav 15-year data

We analyze cosmic superstring models in light of NANOGrav 15-year pulsar timing data. A good fit is found for a string tension Gμ~10^-12--10^-11 and a string intercommutation probability p~10^-3--10^-1. Extrapolation to higher frequencies assuming standard big bang cosmology is compatible at the 68% CL with the current LIGO/Virgo/KAGRA upper limit on a stochastic gravitational wave background in the 10 to 100 Hz range. The superstring interpretation of the NANOGrav data would be robustly testable by future experiments even in modified cosmological scenarios.