Magnetic monopoles and high frequency gravitational waves from quasistable strings

The spontaneous breaking of S O ( 10 ) via flipped S U ( 5 ) to the Standard Model yields a novel scenario in which the superheavy topologically stable grand unified theory (GUT) monopole carrying a single unit ( 2 π / e ) of Dirac magnetic charge emerges from the merger of a confined but topologically distinct monopole-antimonopole pair that are pulled together by a string. The S O ( 10 ) breaking via the subgroup S U ( 4 ) c × S U ( 2 ) L × S U ( 2 ) R , following a similar reasoning, produces a topologically stable monopole that carries two units ( 4 π / e ) of Dirac charge. We explore the cosmological consequences of this scenario by assuming that the monopoles and strings experience a limited number of inflationary e -foldings, before reentering the horizon and ultimately forming a network of quasistable strings bounded by monopole-antimonopole pairs. We identify regions of the parameter space that yield an observable number density of the GUT monopole from the collapse of the appropriate string segments. The gravitational waves emitted by these quasistable cosmic strings lie in the Hz to kHz range, which can be tested in a number of proposed and ongoing experiments.