Particle production and dissipation caused by the Kaluza-Klein tower

Understand

Two-step dissipation is studied in supersymmetric models in which the field in motion couples to bulk fields in the higher dimensional space.

• Since the Kaluza-Klein tower of the intermediate field changes its mass-spectrum during the evolution, there could be back-reaction from the tower.
• Then the system may eventually cause significant dissipation of the kinetic energy if the tower is coupled to light fields in the thermal bath.
• To see what happens in the higher dimensional theory, we consider three models for the scenario, which are carefully prepared.