Nanohertz gravitational waves from cosmic strings and dark photon dark matter
Naoya Kitajima, Kazunori Nakayama
Abstract
The recent observations by pulsar timing array (PTA) experiments suggest the existence of stochastic gravitational wave background in the nano-Hz range. It can be a hint for the new physics and cosmic string is one of the promising candidates. In this paper, we study the implication of the PTA result for cosmic strings and dark photon dark matter produced by the decay of cosmic string loops. It can simultaneously explain the PTA result and present dark matter abundance for the dark photon mass m∼10−7–10−5eV. Implications for the gravitational wave detection with multi-frequency bands are also discussed.
Topics & Concepts
PhysicsCosmic stringDark matterGravitational waveScalar field dark matterHot dark matterAstrophysicsCOSMIC cancer databaseDark fluidPhotonString (physics)AstronomyDark energyCosmologyTheoretical physicsQuantum mechanicsPulsars and Gravitational Waves ResearchCosmology and Gravitation TheoriesCold Atom Physics and Bose-Einstein Condensates