2 ms·
Actually dark matter clumps, e.g. so called dark matter halo of a galaxy[1]. It is seen from rotational curves of galaxies and can be also checked with with str
by nuccy 8y ago
Actually dark matter clumps, e.g. so called dark matter halo of a galaxy[1]. It is seen from rotational curves of galaxies and can be also checked with with strong and weak lensing effects [2].
[1] https://en.wikipedia.org/wiki/Dark_matter_halo https://en.wikipedia.org/wiki/Dark_matter_halo
[2] https://en.wikipedia.org/wiki/Gravitational_lens https://en.wikipedia.org/wiki/Gravitational_lens
- jessriedel 8y agoNo, dark matter will form halos even if it's interactions are solely gravitational. "Clumping" refers to much stronger concentrations from non-gravitational interactions.
- nuccy 8y agoYes, it is correct that clumping can be solely gravitational effect, though so far we have pretty vague idea about the density in those clumps and halos, which are mostly derived from N-body simulation, which are obviously model dependent, e.g. NFW profile [1]. If dark matter interacts with itself one can expect deviations from purely gravitational description due to dark matter analogues of pressure, temperature, viscosity, etc. [1] https://en.wikipedia.org/wiki/Navarro%E2%80%93Frenk%E2%80%93White_profile https://en.wikipedia.org/wiki/Navarro%E2%80%93Frenk%E2%80%93...