"Dynamical interactions" refers to the way in which different things affect and interact with each other in a dynamic or changing way. It involves the exchange or influence of ideas, forces, or actions between multiple elements of a system, often resulting in a complex and evolving relationship.
Full definition
Recent advances in observational technique allow the detection of the extremely faint structure around galaxies, such as loops or debris that are likely made by
dynamical interactions with satellite galaxies..
In their study, Rasio, Rodriguez and colleagues describe in detail
the dynamical interaction processes that could form a merging binary black hole system.
This is in contrast to the prediction of the theory that the low binary frequency in the cluster is caused by the disruption of binaries due to
dynamical interactions.
Some researchers assume that a close system evolves into a wide system over millions of years due to
dynamical interactions, but others guess that turbulence in a gas cloud fragments the cloud into smaller ones and stars are formed in each small cloud.