Does the entropy of the universe as a whole change?

In summary, the conversation discusses the concept of the universe and whether it can change or break into pieces. It also delves into the idea of entropy and whether it can change in the universe. The concept of gravity and its role in counteracting entropy is also explored. The conversation also touches on the idea of the universe as a whole and how it is difficult to apply thermodynamic principles to it. The concept of the strong anthropic principle is mentioned, which suggests that the universe is observed in a way that is compatible with the observer's existence. Finally, the discussion concludes by acknowledging the complexity of discussing the universe as a whole due to the different perspectives and causal contacts of individuals within it.
  • #1
friend
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Does the universe as a whole ever change from being the universe as a whole? Does it ever break into pieces and cease being the universe?

And if anything (like the universe) never changed its state, wouldn't that mean its entropy never changed? Are there any constant thermodynamic properties that can be assigned to the universe as a whole?
 
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  • #2
No. Why would you expect the universe to "break into pieces". Besides "universe" means "everything there is, so the pieces would STILL be the universe (but it's still a non-starter).
 
  • #3
I'm thinking of how the universe may be getting bigger at the same time gravity is drawing things together. Wouldn't gravity have a tendency to counteract the entropy of expansion?
 
  • #4
friend said:
I'm thinking of how the universe may be getting bigger at the same time gravity is drawing things together. Wouldn't gravity have a tendency to counteract the entropy of expansion?
I have no idea what you mean. Dark Energy (whatever it is) has made it so that no only is the universe expanding, the rate of expansion is accelerating. Gravity was overcome some 5 billion years ago. Your late.
 
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  • #5
Or, as I understand it, wave functions are unitary and conserve information. So if we were to write a wave function for the entire universe, what else besides the universe would the universe interact with to collapse the entire universe? If nothing, then the information content of the universe would remain constant, right?
 
  • #6
The wave function of the entire universe need not collapse all. The portion of the universe which is in causal contact with you collapses via interacting with you, hence, you observe a universe that is comparable with your existence. This is called the "strong anthropic principal". It is by no means a widely agreed upon principal but it is something you might be interested in learning about.

Entropy of the universe is always increasing.

Thermodynamic principals are a bit hard to apply to the universe as a whole. If you define the universe as everything that is in causal contact then the universe consists of everything within a certain radius of a chosen object. Your universe and my universe are different because each of us is at the center of a slightly different sphere. Discussing the universe as a whole cannot be done without reference to the things within it, such as a high red-shift galaxy for example. But if we discus a high red-shift galaxy we have to acknowledge that, being in the center of a different sphere, it is in causal contact with things that we are not, and not in causal contact with things that we are.
 

1. What is entropy and how does it relate to the universe?

Entropy is a measure of the disorder or randomness in a system. It is often used to describe the state of the universe as a whole, as it is constantly changing and becoming more disordered over time.

2. Does the entropy of the universe increase or decrease over time?

The second law of thermodynamics states that the total entropy of a closed system, such as the universe, will always increase over time. This means that the universe as a whole is becoming more disordered and chaotic.

3. Can the entropy of the universe ever decrease?

In theory, it is possible for the entropy of a small portion of the universe to decrease, but this would always result in a larger increase in entropy elsewhere. Overall, the entropy of the universe will continue to increase.

4. What factors contribute to the change in entropy of the universe?

The main factor that contributes to the increase in entropy of the universe is the expansion of the universe. As the universe expands, more space and matter become available for particles and energy to disperse and become more disordered.

5. Will the entropy of the universe ever reach a maximum and stop increasing?

It is currently believed that the entropy of the universe will continue to increase until it reaches a maximum value, known as the "heat death" of the universe. At this point, all matter and energy will have reached maximum entropy and the universe will be in a state of equilibrium, with no further changes possible.

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