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\subsection{Cold Dark Matter}  From here we move on to ‘cold’ DM which, unlike hot DM, moves slowly in comparison to the speed of light. It is thought to have been present in the early universe and is believed to have influenced the growth and evolution of galaxies.   \\ \\\\  While a cold DM particle is yet to be found, it likely has very specific properties, i.e. a lack of interaction with the electromagnetic force, yet interacts with the weak and gravitational forces, as astronomers have noticed that dark matter accumulates in galaxy clusters and has a gravitational influence on passing light.   \\ light (See X).   \\\\  In the cold DM theory, structure grows hierarchically, in what is known as the Bottom-Up scenario as a cold DM particle does not have an ultrarelativistic velocity and thus cannot smooth out fluctuations it passes, leading to clusters of matter forming at a smaller size and collapsing and combining to produce the larger structure as time passes.