Replenishment of the comet Oort Cloud during the outward migration of Uranus and Neptune

In the past, the formation process of the distant comet Oort Cloud was simulated assuming the ejecting giant planets in their current orbits and with their current masses. Today, it is however known that the planets formed in a tighter configuration and the comet cloud could be replenished, mostly, in the era of their radial migration. We simulate the Oort-Cloud formation during the planetary migration in course to see if the formation efficiency is larger than that for the stable planetary orbits. As well, we try to answer the question if the ratio of the Oort-Cloud and scattered-disk populations is larger in the case of migration in course to alleviate the problem of too a low ratio in the past simulations. The formation efficiency in the simulations with migrating planets appears to be larger than in that with the planets in stable orbits, but only for the first 100 Myr. Later, it practically disappears. The simulations with the migrating planets result in a higher ratio of the Oort-Cloud and scattered-disk populations. However, this enhancement is only moderate and cannot explain the problem of too a low ratio of both populations.