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We study future observational constraints on cosmic string parameters fromvarious types of next-generation experiments: direct detection of gravitationalwaves (GWs), pulsar timing array, and the cosmic microwave background (CMB). Weconsider both GW burst and stochastic GW background searches by ground- andspace-based interferometers as well as GW background detection in pulsar timingexperiments. We also consider cosmic string contributions to the CMBtemperature and polarization anisotropies. These different types ofobservations offer independent probes of cosmic strings and may enable us toinvestigate cosmic string properties if the signature is detected. In thispaper, we evaluate the power of future experiments to constrain cosmic stringparameters, such as the string tension Gmu, the initial loop size alpha, andthe reconnection probability p, by performing Fisher information matrixcalculations. We find that combining the information from the different typesof observations breaks parameter degeneracies and provides more stringentconstraints on the parameters. We also find future space-borne interferometersindependently provide a highly precise determination of the parameters.

Forecast constraints on cosmic strings from future CMB, pulsar timing and gravitational wave direct detection experiments