In the early universe,why were inhomogeneities in the distribution of normal matter much smaller than the inhomogeneities in the dark matter?
A) Radiation pressure affected normal matter but not dark matter.
B) Magnetic fields smoothed the distribution of charged particles in the normal matter but not in dark matter.
C) Dark matter particles were more massive and cooled off before normal matter,thus dark matter fluctuations had a longer time over which to grow.
D) Dark matter was ten times more massive than normal matter.

Question

Quizplus · Accepted Answer

Radiation pressure from photons affected normal matter, smoothing out its distribution, while dark matter, which does not interact with electromagnetic forces, was unaffected by radiation pressure and could clump more easily.

In the Early Universe,why Were Inhomogeneities in the Distribution of Normal