Decoherence in an Interacting Quantum Field Theory: Thermal Case

Understand

We study the decoherence of a renormalised quantum field theoretical system.

• We consider our novel correlator approach to decoherence where entropy is generated by neglecting observationally inaccessible correlators.
• Using out-of-equilibrium field theory techniques at finite temperatures, we show that the Gaussian von Neumann entropy for a pure quantum state asymptotes to the interacting thermal entropy.
• The decoherence rate can be well described by the single particle decay rate in our model.