How can dark energy comprise 74% of the Universe?

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SUMMARY

Dark energy comprises 74% of the total mass-energy content of the universe, while dark matter accounts for an additional 20%, leaving only 6% for baryonic (ordinary) matter. Cosmologists calculate the average energy density of the universe based on observable data, assuming that the non-observable universe behaves similarly. This assumption is supported by Occam's Razor and the principle of mediocrity, which posits that the universe is homogeneous and isotropic on large scales. The discussion highlights the philosophical implications of these assumptions, particularly regarding the nature of physical laws beyond the observable universe.

PREREQUISITES
  • Understanding of the Lambda Cold Dark Matter (ΛCDM) model
  • Familiarity with the concepts of dark energy and dark matter
  • Knowledge of average energy density calculations in cosmology
  • Basic grasp of Occam's Razor and the principle of mediocrity
NEXT STEPS
  • Research the Lambda Cold Dark Matter (ΛCDM) model in detail
  • Explore the implications of the principle of mediocrity in cosmology
  • Study the methods for calculating average energy density in the universe
  • Investigate the nature and properties of dark energy and its role in cosmic expansion
USEFUL FOR

Astronomers, cosmologists, physics students, and anyone interested in understanding the composition and behavior of the universe.

  • #31
Ok I give up. @PeterDonis why say this

PeterDonis said:
The Hubble sphere is not the boundary of "how far we can see" and is not the same as our observable universe.

You now say this

PeterDonis said:
Nobody said you did. You are misunderstanding what we said is the problem.
I explicitly did not equate them at the same time. For the last time I said the expanding Hubble sphere will mean we can see further (than the currently observable Universe) in the future.

Regards. Andrew
 
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  • #32
andrew s 1905 said:
...we can see further (than the currently observable Universe) in the future.
Are you trying to say simply that, in the future, the OU will be larger, allowing us to see farther?
 
  • #33
andrew s 1905 said:
I said the expanding Hubble sphere will mean we can see further (than the currently observable Universe) in the future.

And that is wrong. I explained why in post #30. That is the only statement of yours that I or anyone else is saying is wrong.

If you had just said "we can see further than the currently observable Universe in the future", that would have been fine. But you said more than that.
 
  • #34
DaveC426913 said:
Are you trying to say simply that, in the future, the OU will be larger, allowing us to see farther?
Yes.
But how far we can see is related to...
I agree you can argue they have the same underlying cause.

I have learned my lesson.

Regards Andrew
 
  • #35
PeterDonis said:
And that is wrong. I explained why in post #30. That is the only statement of yours that I or anyone else is saying is wrong.

If you had just said "we can see further than the currently observable Universe in the future", that would have been fine. But you said more than that.
But they are related contrary to your statement. Light has to cross the Hubble sphere to reach us. See section 3.3 https://www.google.com/url?sa=t&sou...FjABegQIBRAF&usg=AOvVaw0gAqrLMM4grSnGgMqhElQs

Regards Andrew
 
  • #36
andrew s 1905 said:
Light has to cross the Hubble sphere to reach us.

That doesn't mean "they are related", or that the reason the observable universe will be larger in the future is that the Hubble sphere will.

In any case, this subthread is off topic, so please do not post further in it.
 

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