Dark energy substitute

In summary, the conversation discusses the acceleration of the universe's expansion and the usual explanation of dark energy. However, the speaker proposes a different equation of state for matter which can also drive the acceleration without the need for dark energy. This model predicts a final constant energy density, potentially smaller than dark energy, but is not distinguishable from the standard model. The speaker also mentions the possibility of other substitutes for dark energy.
  • #1

wolram

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mic oscillations.
[45] arXiv:1111.0520 [pdf, ps, other]
One explanation for the acceleration of the universe's expansion
Dong-Biao Kang
Comments: 5 pages, 2 figures, 1 tables
Subjects: Cosmology and Extragalactic Astrophysics (astro-ph.CO)

We have observed the acceleration of the expansion of the universe. To explain this phenomenon, we usually introduce the dark energy (DE) which has a negative pressure or we need to modify the Einstein's equation to produce a term which is equivalent to the dark energy. Are there other possibilities? Combining our previous works of statistical mechanics of self-gravitating system with the derivation of van der waals equation, we propose a different matter's equation of state (EoS) in this paper. Then we find that if the matter's density is low enough, its pressure can be negative, which means that it is the matter that drives the expansion's acceleration. So here we will not need to add the DE to the universe. Our results also predict that the universe finally tends to be dominated by an approximate constant energy density, but its value can be smaller than DE. The data of Supernova can not differentiate our model from the standard model, but they may indicate some deviations from LCDM
 
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  • #2
How many more substitutes for dark energy do you know of? is there a (leading) one.
 

1. What is "dark energy substitute"?

"Dark energy substitute" refers to a theoretical concept that attempts to explain the observed acceleration of the expansion of the universe without relying on the existence of dark energy.

2. How does "dark energy substitute" differ from dark energy?

"Dark energy substitute" differs from dark energy in that it is a hypothetical substitute for dark energy that could potentially explain the acceleration of the expansion of the universe without the need for a mysterious, unknown force.

3. What evidence supports the existence of "dark energy substitute"?

Currently, there is no direct evidence for the existence of "dark energy substitute". However, some theories, such as modified gravity theories, propose alternative explanations for the observed acceleration of the expansion of the universe.

4. How would the discovery of "dark energy substitute" impact our understanding of the universe?

If "dark energy substitute" were to be discovered and proven, it would significantly impact our understanding of the universe and potentially revolutionize our current understanding of the laws of physics. It could also open up new avenues of research and potentially lead to new technologies.

5. Is there ongoing research on "dark energy substitute"?

Yes, there is ongoing research on "dark energy substitute" as scientists continue to explore different theories and models that could potentially explain the observed acceleration of the expansion of the universe without the need for dark energy.

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