Most recent answer: 05/03/2018
- Heather Brutosky (age 43)
Helena MT USA
The missing piece is that the inflation is supposed to be driven by some vacuum field being temporarily stuck in un unstable high-energy state. If you've ever seen a bottle of supercooled water (https://van.physics.illinois.edu/qa/listing.php?id=1618), cold enough that it should be ice, that's an example of such an unstable state. It takes some sort of local accident to trigger the formation of the lower-energy state (ice, for the water case), a non-inflating universe in the cosmic case).
But why doesn't the whole universe leave the rapidly inflating state once the new state gets triggered somewhere? The inflation is so fast that it beats the formation of the new type of space. The old inflating one is growing faster than the rate at which it's losing parts to the new states, for example states like the type we live in. This feature is quite unlike the behavior of supercooled water!
(published on 05/03/2018)