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The recent observations by pulsar timing array (PTA) experiments suggest theexistence of stochastic gravitational wave background in the nano-Hz range. Itcan be a hint for the new physics and cosmic string is one of the promisingcandidate. In this paper, we study the implication of the PTA result for cosmicstrings and dark photon dark matter produced by the decay of cosmic stringloops. It can simultaneously explain the PTA result and present dark matterabundance for the dark photon mass m~10^{-6}--10^{-4}eV. Implications for thegravitational wave detection with multi-frequency bands are also discussed.

Nanohertz gravitational waves from cosmic strings and dark photon dark matter