Amateur Cosmologist: Two Puzzles
Most versions of the Lambda-CDM (cosmological constant plus cold dark matter) predict that dark matter concentration should peak strongly in the centers of galaxy clusters - forming a so-called cusp. Puzzle #1: Actual distributions seem to be cuspless and rounded. Why so?
The hot intra-cluster gas that makes up most of their normal matter mass radiates due to ion collisions (mean free path - l light year). Densities are near the centers so collisions are more frequent, more energy is radiated, and the gas cools faster. This should result in so-called cooling flows as hotter outer gas moves in to take the place of the now cooler gas, some of which should form neutral atoms and ultimately, stars. Puzzle #2: Such flows appear absent. Why?
Your amateur cosmologer has his crackpot idea of the year.
Dark matter is presumed to be composed more or less equally of darkons and anti-darkons, which, on those odd occasions on which they interact, annihilate. If the annihilation cross section is higher than expected, could that smooth out cusps? Could the energy released reheat central baryonic gas?