Entropy of horizons and particles

In summary, the cosmological event horizon holds an entropy associated with its surface, which places a constraint on the entropy inside that surface. As the universe accelerates and the cosmological event horizon shrinks, the entropy constraint inside also decreases. This decrease in cosmological entropy could potentially lead to the emergence of life. However, it is uncertain if the entropy inside the event horizon could ever be greater than that of the surface, and if the universe's expansion could lead to the formation of particles as a way to reduce entropy. The relationship between entropy, particles, and the creation of structures is still not fully understood and the question of whether entropy travels faster than light remains unanswered. Further research is needed to determine the average entropy density of the universe and
  • #1
1,313
0
It seems that the cosmological event horizon has an entropy associated with its surface and which constrains the entropy inside that surface calculated in the same way as the entropy of a BH horizon. And recently we discovered that the universe is accelerating so that the cosmological event horizon is getting smaller. With a shrinking cosmological event horizon comes a decrease in the entropy constraint inside the smaller volume. I wonder if this decrease in cosmological entropy might have an effect to force complexity to arise. Could this be responsible for the creation of life, etc.

To that end, I wonder could the entropy inside the volume of the cos. event horizon ever be more than that calculated for the surface of the cosmological event horizon? Then a shrinkage of the cosmological event horizon would force the material inside to assume a form which decreases entropy (life?) But it may be that the cosmological event horizon could alway be so much more than what could ever exist inside it that there would be no force on matter states to lower entropy. Some believe that there is a certain amount of entropy associated with each particle, and some believe that space itself has a certain amount of entropy. So, in order to resolve these questions, I imagine that the expansion of the universe accelerates so much that the cosmological event horizon approaches to zero. How would the empty space inside respond?.

If there were no particles inside this shrinking cosmological event horizon, and space itself had no entropy, then there would be zero entropy inside. I suppose that the cosmological event horizon could shrink to zero in this state without having any effects. But I hear, however, that curved space may have some entropy associated with it. Then the universe could not expand any faster than it uncurls. Is it possible for the universe then to expand fast enough so the that a shrinking cosmological event horizon could entrap the entropy of some uncurling space? What would be the result, would that be to create particles as a store of information as an entropy reducing process? It does seem that shrinking event horizons to create particles in the case of black holes. I wonder if this is not the process that created the original particles during inflation when space expanded very fast and particles appeared on the scene. If particles have structure, then isn't structure a type of signal that contains information? I hear some string theorist say that strings do contain information as part of their structure. Can we then calculate the entropy of particles without knowing what their exact nature is? What are the smallest particles given off as the smallest black hole evaporates to nothing? And what is the entropy calculated for this smallest black hole?

OK, suppose now that particles have entropy, what is the minimum cosmological horizon that can exist given the density of the universe before any further shrinkage will start to cause material to congeal and form additional structures. Is this the same as gravity? Some think gravity itself has entropy associated with it. I think not since then an increasing cosmological horizon would be anti-gravity, which we don't see when the universe was decelerating.

One of the questions that has to be answered along these lines is whether entropy is something that travels faster than light. If the cosmological event horizon shrinks a given amount, does this have immediate effects, or does that information take time to work its way throughout the system? I understand entropy to be an equation describing the whole state of a system no matter how its particles are distributed and no matter how they are moving. So then any change in an entropy constraint must have immediate effects throughout the system. It seems curious that the universe started accelerating about the same time that life appeared on earth. Is that a coincidence? Or is this the creation principle?
 
Last edited:
Physics news on Phys.org
  • #2
Entropy, horizons, particles, and life.

Mike2 said:
If particles have structure, then isn't structure a type of signal that contains information? I hear some string theorist say that strings do contain information as part of their structure. Can we then calculate the entropy of particles without knowing what their exact nature is? What are the smallest particles given off as the smallest black hole evaporates to nothing? And what is the entropy calculated for this smallest black hole?
I suppose we can consider a particle with mass, m, to be a black hole of mass, m, find the surface area of a black hole of mass, m, and calculate the entropy of that size of a black hole, right? That would be the information content of that particle, right? But the faster a particle travels the more mass it has, and the more information/entropy it has. So is information/entropy a relative thing?

The next question would be: what is the average entropy/information density of the universe. To answer this we need to know how much information/entropy is contained galaxies. Matter is not evenly distributed throughout the universe but is clumped into galaxies. Perhaps the information content of a galaxies is proportional to the volume of the universe divided by the volume occupied by galaxies. What do you think?
 
  • #3



The concept of entropy is a fundamental concept in thermodynamics and cosmology, and it is often associated with the concept of disorder and randomness in a system. In the case of horizons and particles, the entropy associated with these structures is a measure of the information contained within them. The cosmological event horizon, which marks the boundary of the observable universe, has an entropy associated with its surface, just like a black hole horizon. As the universe accelerates and the cosmological event horizon shrinks, there is a decrease in the entropy constraint inside that volume. This raises questions about the relationship between entropy and the emergence of complexity, such as life.

Some theories suggest that there is a certain amount of entropy associated with each particle and with space itself. In the case of a shrinking cosmological event horizon, if there are no particles inside and space has no entropy, then there would be zero entropy inside. In this scenario, the shrinking of the horizon would not have any effects. However, if space does have some entropy associated with it, then the shrinking of the horizon could potentially trap this entropy and create particles as a way to reduce entropy. This could be a possible explanation for the creation of particles during inflation.

Furthermore, the idea that particles have structure and contain information is also relevant in this discussion. Some theories, such as string theory, suggest that strings contain information as part of their structure. This raises the question of whether we can calculate the entropy of particles without knowing their exact nature. Additionally, as the smallest black hole evaporates to nothing, what is the entropy calculated for this smallest black hole? These are complex questions that require further research and understanding.

Another important aspect to consider is the relationship between entropy and gravity. It is often debated whether gravity itself has entropy associated with it. Some argue that it does not, while others suggest that it does. If gravity does have entropy, then a shrinking cosmological event horizon would imply an anti-gravity effect, which is not observed when the universe was decelerating. This raises questions about the nature of gravity and its relationship with entropy.

One question that needs to be addressed is whether entropy is something that travels faster than light. If the cosmological event horizon shrinks, does this have immediate effects throughout the system, or does the information take time to propagate? According to the laws of thermodynamics, any change in entropy must have immediate effects throughout the system. This could potentially explain the coincidence of the universe starting to accelerate around
 

1. What is entropy of horizons and particles?

Entropy of horizons and particles is a measure of the disorder or randomness of a system. It can be thought of as the amount of energy that is unavailable to do useful work.

2. How is entropy related to horizons and particles?

Entropy is closely related to horizons and particles in the sense that it is a fundamental property of any system with horizons or particles. As the number of horizons and particles in a system increases, so does the entropy.

3. Can entropy of horizons and particles be reversed?

No, entropy of horizons and particles cannot be reversed. The Second Law of Thermodynamics states that the total entropy of a closed system always increases over time. While local decreases in entropy are possible, the overall trend is always towards an increase in entropy.

4. How does the entropy of horizons and particles affect the universe?

The entropy of horizons and particles plays a crucial role in shaping the universe. As the universe expands and cools, the number of horizons and particles increases, leading to a constant increase in entropy. This ultimately leads to the inevitable "heat death" of the universe, where all matter and energy is evenly distributed and no useful work can be done.

5. Is there a way to measure the entropy of horizons and particles?

Yes, there are various ways to measure the entropy of horizons and particles. One common method is through the use of statistical mechanics, which calculates the average entropy of a system based on the energy and number of particles present. Other methods include using thermodynamic principles and information theory.

Suggested for: Entropy of horizons and particles

Replies
3
Views
1K
Replies
16
Views
2K
Replies
4
Views
2K
Replies
1
Views
1K
Replies
21
Views
3K
Replies
12
Views
2K
Back
Top