Potentially great article over at
LA Times- unfortunately the interviewer is an idiot and seemingly can't understand responses lucidly enough to dig deeper into the topic.
Here are some excerpts:
The most obvious fact about the history of the universe is the growth of entropy from the early times to the late times.
The fact that you can turn eggs into omelets but not vice versa is a thing we know from our kitchens.
You don't need to spend millions of dollars on telescopes to discover it.
Can you give me a simple explanation of entropy?
One way of explaining entropy is to say it's the number of ways you can rearrange the constituents of a system so that you don't notice the change macroscopically.
If you mix milk into a cup of coffee, the more mixing that occurs, the more disordered the milk molecules become and the more entropy builds.
If all the milk was somehow separated from the coffee, that would be low entropy.
Did the author really not realize the omelet was a "simple explanation of entropy"?
Another:
Are you saying that our universe came from some other universe?
Right. It came from a bigger space-time that we don't observe. Our universe came from a tiny little bit of a larger high-entropy space.
I'm not saying this is true; I'm saying this is an idea worth thinking about.
You're saying that in some universes there could be a person like you drinking coffee, but out of a blue cup rather than a red one.
I don't think that's what he's saying at all.
Here's the most original and interesting idea that Dr. Carrol brings up in my opinion:
Our experience of time depends upon the growth of entropy. You can't imagine a person looking around and saying, "Time is flowing in the wrong direction," because your sense of time is due to entropy increasing. . . . This feeling that we're moving through time has to do with the fact that as we live, we feed on entropy. . . . Time exists without entropy, but entropy is what gives time its special character.
Entropy gives time its appearance of forward motion?
Yeah, its directionality. The distinction between past and future. If you're floating in outer space, in a spacesuit, there would be no difference between one direction and another. However, nowhere in the universe would you confuse yesterday and tomorrow. That's all because of entropy, and that's the arrow of time.
Unfortunately the author is not able to carry the topic any deeper. Scientific American fortunately goes into more
detail. If anyone would like to discuss these ideas further, leave a comment.