A simple solution to the monopole problem: SU(5) GUT with symmetry breaking into special subgroup
This paper proposes an alternative to cosmological inflation for solving the magnetic monopole problem within SU(5) Grand Unified Theories (GUTs). It suggests that a specific symmetry-breaking sequence, involving a tensor scalar field, realizes the Langacker–Pi mechanism. This process connects monopoles and antimonopoles via cosmic strings for annihilation and restores the Standard Model gauge group, potentially creating a detectable stochastic gravitational wave background.