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When dark matter is called collisionless, does it only mean that they do not collide and scatter, or does it also mean that there is no other significant non-contact interaction?
Collisionless dark matter is a type of dark matter that does not interact with other particles through the electromagnetic force. This means that it does not emit or absorb light, making it invisible to telescopes and other instruments used to study the universe.
Collisionless dark matter is different from other types of dark matter because it does not experience any collisions or interactions with other particles. This allows it to form large, diffuse structures in the universe, such as halos around galaxies.
The main evidence for the existence of collisionless dark matter comes from observations of the rotation curves of galaxies and the gravitational lensing of light from distant objects. Both of these phenomena suggest the presence of a large amount of invisible mass that cannot be explained by ordinary matter.
Collisionless dark matter plays a crucial role in the formation and evolution of large-scale structures in the universe, such as galaxies and galaxy clusters. Its gravitational pull helps to bring together ordinary matter and form these structures over time.
Yes, there are several experiments and studies being conducted to better understand collisionless dark matter. These include particle physics experiments, such as the Large Hadron Collider, as well as astronomical surveys and simulations. These efforts aim to detect and study the properties of collisionless dark matter in order to gain a better understanding of its role in the universe.