The Effect of Decoherence on Inflation

There was no observer to make the first measurement, or no macroscopic object for something to interact with and cause decoherence. If this sounds a little fuzzy, then that's fine. It is fuzzy. You can do all of that right there near the Big Bang. There's just an environment and you can do it. But it's not quite as easy as it is in the laboratory laboratory. In the early universe, that's not so straightforward. That's why I have to write papers about it rather than just quickly calculating it and getting on with your life.