Zero modes on cosmic string loops

Understand

We study the spectrum of fermionic modes on cosmic string loops.

• We find no fermionic zero modes nor massive bound states - this implies that vortons stabilized by fermionic currents do not exist.
• We have also studied kink-(anti)kink and vortex-(anti)vortex systems and find that all systems that have vanishing net topological charge do not support fermionic bound modes.