When the interaction with the environment is taken into account, the dynamics
is not unitary anymore and the equation of motion rarely has an analytic
solution. Therefore one often has to make approximations in order to
obtain analytical results. The two most common approximations are the Born
or weak coupling approximation, and the Markov approximation. The former
assumes that the system and the reservoir are not interacting very strongly,
while the latter one neglects the short time correlations between the system
and the reservoir.
No comments:
Post a Comment