The weak nuclear force is one of the four fundamental forces of nature, along with gravity, electromagnetism, and the strong nuclear force. It is responsible for some forms of radioactive decay and plays a role in nuclear fusion reactions.
In the context of dark matter, the weak nuclear force is relevant because it is one of the few known ways that dark matter particles might interact with normal matter particles. While dark matter particles are not believed to interact through the electromagnetic force, they could potentially interact through the weak nuclear force if they have the right properties.
Several proposed candidates for dark matter particles, such as Weakly Interacting Massive Particles (WIMPs) and sterile neutrinos, are thought to interact through the weak nuclear force, although the precise nature of these interactions is still unknown.
The lack of magnetic polarity in dark matter does not preclude the possibility of weak nuclear interactions, since the weak nuclear force is a separate fundamental force that does not depend on magnetic properties.
Therefore, while dark matter is not known to have magnetic polarity, it could potentially interact with normal matter particles through the weak nuclear force, providing one possible way to detect or study this elusive form of matter.