Detecting Cosmic Gravitational-wave Background from Super-heavy Cosmic
  Strings with LISA
  Although cosmic string scenario for galaxy formation is disfavored by CMB
data, it is of great interest in the generation of cosmic gravitational-wave
background. This research aims to develop an algorithm to extract cosmic
gravitational-wave background produced by cosmic strings from the LISA data
stream, and apply the algorithm to the simulated data stream containing the
background produced by cosmic strings with various strength to study the
detection threshold for this source. For 1-yr observation, It is found that the
detection threshold of G{\mu} is 3.12 \times 10^-16 in the standard scenario.
In the case that p and {\epsilon} are adjustable, the detectable region in
parameter space is defined by (G{\mu})^2/3 {\epsilon}^-1/3 / p> 4.6 \times
10-11.
