Questions tagged [dark-energy]
Questions regarding the as-yet-unknown energy permeating the universe that is responsible for its expansion.
6
questions with no upvoted or accepted answers
2
votes
0answers
55 views
Definition of space - to cope with “space expansion”
I've searched quite a lot but found no satisfying definition, so please:
How do we actually define space when talking of "space expansion"? Isn't it just a metric, a dimension we measure, instead of ...
2
votes
1answer
123 views
The energy density of DM (to be fluid,state parameter=-2)increases with time. Does it violate the concept of accelerating universe?
We know that dark energy with value of state parameter $\omega<-1$ is called phantom dark energy model. In this model if we assume dark energy to be a fluid with value of state parameter $\omega=-2$...
2
votes
1answer
106 views
Can eternal inflation and gravity explain dark energy?
First of all, I have absolutely no background in astronomy and physics. I just watch a lot of "i-hope-scientific" youtube channels talking about physics and astrophysics and I can kind of follow the ...
1
vote
0answers
46 views
Formula to Compute sigma8 for correction in non-linear regime
I try to explain my issue on this forum since it seems to be appropriate.
I need to apply a correction on $\sigma_{8}$ between linear and non-linear regime to keep it fixed (I make change the values ...
1
vote
0answers
53 views
How are constraints on dark energy improved the most?
Today we have various data available from independent probes to constrain dark energy, i.e. its equation of state $w$. These include Type 1a supernovae, BAO, CMB, large-scale galaxy surveys, etc. Are ...
-3
votes
1answer
112 views
In what form was dark energy stored 6 billion years ago?
Bearing in mind the provisions of the 1st Law of Thermodynamics, which decrees that energy can neither be created nor destroyed, all the energy in the Universe must have been there at the time of the ...
