In the current understanding of dark matter dynamics, it is believed that large galaxies can indeed acquire dark matter from smaller galaxies through a process known as "galactic cannibalism" or "galactic mergers." During these mergers, smaller galaxies can be absorbed by larger galaxies, and their dark matter content can become part of the larger galaxy's dark matter halo.
Dark matter is a hypothetical form of matter that does not interact with light or other electromagnetic radiation, making it difficult to observe directly. Its presence is inferred through its gravitational effects on visible matter and the large-scale structure of the universe. According to the prevailing theory, dark matter halos surround galaxies, providing the gravitational scaffolding that helps galaxies form and hold their structures together.
When a small galaxy comes close to a larger galaxy, the gravitational interaction between the two can cause tidal forces that stretch and distort the smaller galaxy. These tidal forces can strip away stars and gas from the smaller galaxy, and in some cases, part of its dark matter can also be stripped and absorbed by the larger galaxy.
Galactic mergers and interactions are relatively common in the universe, and they play a significant role in shaping the structures we observe. Through these interactions, large galaxies can grow by incorporating the dark matter, stars, and gas from smaller galaxies.
However, it is important to note that the exact mechanisms of dark matter transfer during galactic mergers are still an active area of research and the subject of ongoing investigation. The precise details of dark matter behavior and its interactions with visible matter are complex and continue to be studied by astronomers and physicists.