Normally we expect an expanding gas will cool, but if the rate of expansion were accelerating then the temperature of the gas might be steady or even increasing.
If the observable universe is expanding at an increasing rate, is the temperature of the universe is decreasing, steady or increasing? Perhaps the universe began cold, and what happened was a big warming, instead of a big bang. However, a big bang is a possible future scenario, so CERN tells us what might be, instead of what was. harry
