Dark Matter
Table of Contents
1. Self-Interacting Dark Matter
- SIDM
Hypothesis that dark matter interact with itself, in addition to gravity.
2. MOdified Newtonian Dynamics
- MOND
Hypothesis that the gravity changes its strength based on length scale.
3. Bullet Cluster
It is two colliding clusters of galaxies, where the distribution mass obtained based on the gravitational lensing is outpacing the movement of the intergalactic gas which are colliding in the interface of the collision and stagnating behind.
It is known that the majority of the mass comes from the gas. But, the mass distribution aligns with the distribution of galaxies which did not interact with each other much. This suggest the existence of non-interacting matter.