Forecast constraints on cosmic strings from future CMB, pulsar timing
  and gravitational wave direct detection experiments
  We study future observational constraints on cosmic string parameters from
various types of next-generation experiments: direct detection of gravitational
waves (GWs), pulsar timing array, and the cosmic microwave background (CMB). We
consider both GW burst and stochastic GW background searches by ground- and
space-based interferometers as well as GW background detection in pulsar timing
experiments. We also consider cosmic string contributions to the CMB
temperature and polarization anisotropies. These different types of
observations offer independent probes of cosmic strings and may enable us to
investigate cosmic string properties if the signature is detected. In this
paper, we evaluate the power of future experiments to constrain cosmic string
parameters, such as the string tension Gmu, the initial loop size alpha, and
the reconnection probability p, by performing Fisher information matrix
calculations. We find that combining the information from the different types
of observations breaks parameter degeneracies and provides more stringent
constraints on the parameters. We also find future space-borne interferometers
independently provide a highly precise determination of the parameters.
