The current understanding of dark matter does not suggest that it would be the cause of the contraction of our universe in the far future. In fact, dark matter is primarily considered as a form of matter that interacts through gravity and helps in the formation and stability of cosmic structures like galaxies, galaxy clusters, and superclusters.
The idea of the universe's expansion and potential future contraction is related to the concept of the cosmological model and the composition of the universe's energy density. The standard cosmological model, supported by various observational evidence, including the cosmic microwave background radiation and the observed redshift of distant galaxies, suggests that the universe is currently undergoing an accelerated expansion driven by a mysterious form of energy called dark energy.
Dark energy, unlike dark matter, does not cluster like matter but instead permeates space uniformly. It is postulated to possess negative pressure, which causes the accelerated expansion. If dark energy remains constant or increases over time, it could lead to a scenario where the expansion continues indefinitely, potentially resulting in the universe's "heat death."
Conversely, a contraction of the universe, often referred to as the "Big Crunch," would require certain conditions, such as a significant deviation from the observed behavior of dark energy. While it is difficult to predict the precise fate of the universe, current observational data and theoretical models suggest that the expansion driven by dark energy will likely continue or even accelerate, rather than leading to a contraction caused by dark matter.
However, it's important to note that our understanding of dark energy and the fate of the universe is an active area of research, and new discoveries or revised models could provide different insights in the future.