Sean Carroll on Why Does Time Exist at All?

In summary, Sean Carroll's TedTalk last month explored the idea of whether the big bang was truly the beginning. He also raised the question of whether this concept could be explained by the simple multiverse theory. As a well-informed enthusiast, the speaker believes that in order to avoid speculations, scientists should first gather more evidence and get closer to the Big Bang before drawing conclusions about its nature. They also express interest in hearing thoughts from experts in relevant fields, particularly @PeterDonis.
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Greg Bernhardt
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Interesting TedTalk from Sean Carroll last month.



At the end he asks the question of whether the big bang was really the beginning. Is this simple multiverse talk? Thoughts?
 
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It's a nice talk. Now, as a somewhat informed enthusiast, I just think that in order to avoid speculations, scientists of the relevant fields, must first get closer to the Big Bang - orders of subdivisions of sec, than we are today. Only this way, they can conclude if it is the event we believe it is today and consequently search for something before that (or not?). I can't think of any other safe way, to reach a conclusion. But I'd like to see thoughts of the great expert people here in relevant fields (especially by @PeterDonis).
 

1. How does Sean Carroll define time?

Sean Carroll defines time as the progression of events from the past to the present to the future.

2. What is the purpose of Carroll's book "From Eternity to Here"?

The purpose of Carroll's book is to explore the concept of time and its relationship to the universe, as well as to provide a deeper understanding of why time exists.

3. Why is the question of why time exists important in physics?

The question of why time exists is important in physics because it helps us understand the fundamental nature of the universe and how it functions. It also allows us to make predictions and explanations about the behavior of matter and energy.

4. How does Carroll explain the arrow of time?

Carroll explains the arrow of time as the directionality of the universe's expansion, as well as the tendency for entropy (disorder) to increase over time. This allows us to distinguish between the past, present, and future.

5. Is Carroll's view on the existence of time widely accepted in the scientific community?

While Carroll's view on the existence of time is widely debated, his theories are supported by many scientists in the physics community. However, there are also alternative theories and interpretations of time that are still being explored and studied.

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