Absorption and stationary times for the $Λ$-Wright-Fisher process

Abstract: We derive stationary and fixation times for the multi-type $\Lambda$-Wright-Fisher process with and without the classic linear drift that models mutations. Our method relies on a grand coupling of the process realized through the so-called lookdown-construction. A well-known process embedded in this construction is the fixation line. We generalise the process to our setup and make use of the associated explosion times to obtain a representation of the fixation and stationary times in terms of the waiting time in a coupon collector problem.