Rotation curves of galaxies seem to require more mass than observed - the conventional solution is the introduction of Dark Matter.
Reading some articles on this topic (in particular a recent philosophical investigation of cosmology) showed a remarkable relation between the apparent missing mass of galaxies and the acceleration at that position of the galaxy (Fig 2 in the article):
The x-axis is the acceleration, and the y-axis stands for the apparent mass-discrepancy. The data-points stem from many different galaxies and positions within those galaxies As it is known, the further out [=smaller acceleration] one looks, the larger the apparent requirement for dark matter.
Discovery of this particular plot go back to a paper in 1990 by Sanders. Unfortunatly I was not able to find any theoretical explanation from the standard-model of cosmology ΛCDM. Why would dark matter behave exactly like that - as far as I understand, predictable from visibile matter?
Concretely, my two questions:
- How can this phenomenon be described with ΛCDM?
- Is it related to a recent article on rotational velocities in PRL, which finds also very simple empirical laws on galaxy rotations without the need of dark matter?