I am trying to model an open system interaction without making strong assumptions on coupling strength or temperature. In general i understand that open systems are modeled by a Lindbladian, but as far as i know the Lindbladian approximation holds only if we have Marcov, Born and Circular Wave approximation. Since I want to cover a broad range of temperatures and coupling strengths how should i model the bath? Any suggestions on how to proceed?
More specificly a colleague suggested using the coupled harmonic oscillator formalism has the advantage of not making any assumptions apart from being modelable by harmonic oscillators and being analytical solvable! Anyone has recommendations where i can read up how this is done or an opinion if this approach is valid?