DeSitter cosmological horizon stability?

In summary, the conversation discusses the possibility of the universe reaching a DeSitter spacetime where there would be a cosmological horizon that would radiate similar to a black hole. However, there is uncertainty about whether this horizon would eventually evaporate due to the cosmological constant diluting. The validity of this speculation is also questioned, as it cannot be tested by experiments currently or in the foreseeable future. There is also a discussion about whether the radiation from the horizon would eventually be reabsorbed, but the model in question does not seem to suggest this. Overall, the conversation presents a speculative model with uncertainties about its validity and implications for the stability of the cosmological horizon.
  • #1
Suekdccia
259
24
TL;DR Summary
DeSitter cosmological horizon stability?
If the universe keeps expanding at an accelerated rate (given by the cosmological constant) then the universe would approach a DeSitter spacetime where there would be a cosmological horizon that would radiate just as the event horizon of a black hole radiates Hawking radiation

I thought that once this state is reached, the universe would stay like that, but I recently discovered that this horizon could evaporate just like a black hole and the cosmological constant would dilute (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6560872).

Is this true? Even if that happened and the expansion would stop being accelerated by a cosmological constanr, what would happen then after?
 
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  • #2
Suekdccia said:
Is this true?
It's a speculative model which we have no way of testing by experiment now or in the foreseeable future.
 
  • #3
PeterDonis said:
It's a speculative model which we have no way of testing by experiment now or in the foreseeable future.
Even if this model was right and the horizon tends to evaporate, wouldn't the radiation eventually be reabsorbed by the cosmological horizon (balancing the process and keeping the horizon stable after all)?
 
  • #4
Suekdccia said:
Even if this model was right and the horizon tends to evaporate, wouldn't the radiation eventually be reabsorbed by the cosmological horizon (balancing the process and keeping the horizon stable after all)?
The model in the paper does not appear to be saying that (it appears to be saying that the ultimate limit of the process is flat spacetime), but I'm not sure how valid the model in the paper is. As I said, it's speculative, and many speculative models turn out to have inconsistencies in them that aren't obvious at first glance.
 

1. What is the DeSitter cosmological horizon stability?

The DeSitter cosmological horizon stability refers to the stability of the cosmological horizon in a DeSitter universe. In cosmology, a DeSitter universe is a model of the universe that is characterized by a constant positive curvature and a positive cosmological constant. The cosmological horizon is the boundary between the observable universe and the unobservable universe. The stability of this horizon is important in understanding the evolution and fate of the universe.

2. Why is the stability of the DeSitter cosmological horizon important?

The stability of the DeSitter cosmological horizon is important because it affects the overall stability and evolution of the universe. If the horizon is unstable, it could lead to significant changes in the universe's expansion rate and potentially alter the fate of the universe. Additionally, understanding the stability of the horizon can provide insights into the underlying physics and dynamics of the universe.

3. How is the stability of the DeSitter cosmological horizon determined?

The stability of the DeSitter cosmological horizon is determined by analyzing the behavior of matter and energy near the horizon. This can be done through mathematical models and simulations, as well as observations of the universe. The stability is also influenced by the cosmological constant, which is a fundamental parameter in cosmology.

4. What are the potential consequences of an unstable DeSitter cosmological horizon?

If the DeSitter cosmological horizon is found to be unstable, it could have significant consequences for our understanding of the universe. It could lead to changes in the expansion rate of the universe, alter the behavior of matter and energy, and potentially affect the overall fate of the universe. It could also challenge current theories and models of cosmology.

5. What recent advancements have been made in studying the stability of the DeSitter cosmological horizon?

In recent years, there have been several advancements in studying the stability of the DeSitter cosmological horizon. These include improved mathematical models and simulations, as well as observations from telescopes and other instruments. Additionally, there have been efforts to incorporate the effects of dark energy and other unknown factors into the study of the horizon's stability.

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