I'm told that the cosmological event horizon produces a temperature at every point of space similar to how a black hole event horizon produces a radiation near its surface. If there exists a temperature, then there must be particles to produce that temperature. They must be baryons since normal matter could feel that temperature. So the question is how much entra matter is produced by the cosmic event horizon? I imagine it must be very small, but since it occupies all of otherwise empty space, its contribution might be considerable. Any thoughts?