No, dark matter is not proof of the existence of two separate realities or a direct consequence of coherence and decoherence in quantum mechanics.
Dark matter is a hypothetical form of matter that does not interact with light or other electromagnetic radiation, making it invisible and difficult to detect directly. It was postulated to explain the observed gravitational effects in the universe that cannot be accounted for by the visible matter alone.
The idea of multiple realities or parallel universes is a topic within theoretical physics, particularly in the context of theories like the multiverse hypothesis or the many-worlds interpretation of quantum mechanics. However, the existence of dark matter is not directly related to these concepts.
Dark matter is currently a subject of active research in astrophysics and particle physics. While its precise nature is still unknown, there are several proposed theories and particles that could explain dark matter. These include weakly interacting massive particles (WIMPs), axions, and others. Experimental efforts are underway to detect and study dark matter, but so far, its direct detection has remained elusive.
In summary, dark matter is not evidence of two realities or a direct consequence of coherence and decoherence in quantum mechanics. It is a hypothetical form of matter that is postulated to explain certain gravitational effects in the universe, and its exact nature is still a subject of ongoing scientific investigation.