In our garden, we have a little pool to enjoy our 2 children. It is 3 meters in diameter and contains some 4 m³ of water.
For cleaning-convenience every evening I go walking some 5 or 10 rounds in the pool all in the same direction, to set up a relatively fast rotating current in the pool. As a result, all of the remaining dirt (leaves, insects and seeds) are gathered together in the middle of the pool, where they can be easily removed.
So the analogy to galaxies is as follows:
- The pool represents the galaxy.
- The water represents the space-time? (or all we cannot see in a galaxy? Or the galaxy as a whole?)
- The dirt represents barionic matter which is forced to be dense in the center of the galaxy, hence building the super massive black hole.
It is clear that it is perhaps no good idea trying to map a 3m standup pool to a 100000 lightyear galaxy, but the observation seems to be worth a thought (and I do not think that I am the first one searching for analogies in that direction).
The question now is, could this be a valid analogy to the process of building supermassive black holes as a result of rotation?