The discussion explores the possibility of stars and planets being composed entirely of dark matter (DM), including considerations of how such celestial bodies could be detected and the physical principles governing their formation.
Participants generally disagree on the feasibility of dark matter forming stars or planets, with multiple competing views regarding the physical properties of dark matter and its ability to collapse into larger celestial bodies.
The discussion highlights limitations in understanding the energy dynamics of dark matter and its interactions, particularly regarding its inability to lose energy and the implications for celestial formation.
How much energy does it need to get rid of in order to collapse to one of these celestial bodies?Orodruin said:No. Dark matter has no way of getting rid of enough energy to collapse that far.
The problem is that DM cannot lose energy. For instance, think two masses (baryonic) that are colliding with each other. If they make an inelastic collision then they will lose some energy which means that kinetic energy of the particles transforms into heat or etc. Now, they are moving as one piece.However if DM is made from particles, according to the observations, they cannot lose their energy via heat. This implies that they cannot combine with each other to create bigger objects. Because this process needs an energy transformation from kinetic energy to heat, which DM particles are not capable of.MathematicalPhysicist said:How much energy does it need to get rid of in order to collapse to one of these celestial bodies?
Contrary to your signature, DM don't connect... :-)Arman777 said:However if DM is made from particles, according to the observations, they cannot their energy via heat. This implies that they cannot combine with each other to create bigger objects. Because this process needs an energy transformation from kinetic energy to heat, which DM particles are not capable of.