Questions tagged [dark-energy]
Questions regarding the as-yet-unknown energy permeating the universe that is responsible for its expansion.
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The origins of Dark Matter/Dark Energy
Layman here with an affinity for astronomy, space and everything associated with it. I'm a big fan of the space oriented programs on the Discovery and Science channels and I was watching an episode ...
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109 views
What was the process of calculating how much darkmatter/matter/dark energy the observable universe consists of and how did it come at this conclusion
In 2015 the Planck satellite consortium released an analysis of data collected by the Planck satellite that showed this percentage break down of the universe’s mass/energy.
Ordinary matter: 4.9%
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113 views
How can space expand in accelerating speed when dark energy is constant?
I came to know that dark energy is constant.As mentioned in the Friedmann equations
How can a constant energy cause an ...
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2answers
362 views
Does gravity repel when dark energy is involved?
So I am currently reading the book We have no idea by Jorge Cham and Daniel Whiteson.
In one of their chapters they talk about how gravity is a force that only attracts and doesn't repel, most of the ...
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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 ...
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0answers
54 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 ...
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1answer
140 views
What's the relation between Einstein's Gravitational Theory and Dark Matter?
I was reading an elementary book on dark matter (in fact, a historical perspective) and there were mentioned how the scientific community react to the idea of dark matter proposed as a solution to ...
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2answers
185 views
Would dark energy save the earth for a while as the sun heats up?
Would the expansion of space (e.g. dark energy) move the earth further away from the sun over time, possibly saving us for perhaps a few billion years as the sun heats up?
Scientists now tend to ...
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2answers
108 views
How do you measure something that has already left the observable universe?
They say that the observable universe is only 5% of the entire equation. The rest of it consists of dark matter and energy. I believe that they are trying to find a way to see something that cannot be ...
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1answer
114 views
Are there Dark Stars
In the visible universe, we have a lot of matter to energy conversion going on in stars. Is there an equivalent structure that is converting dark matter to dark energy?
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1answer
1k views
If the Universe is infinite, would heat death be impossible?
If the Universe is infinite, one would imagine that if we kept moving through space, we'd constantly find newer and newer galaxies and objects forever. This would imply that there is an infinite ...
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1answer
451 views
could dark energy be a force coming from the hyperspace outside the universe?
It seems to me that the expansion of the universe is only being looked at one way. a repelling force, basically being the opposite of gravity. After pondering this for many nights, I began to wonder ...
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1answer
267 views
How strong is the gravitational stretch we experience from the edge of the universe?
How much gravitational effect do we experience (e.g. maybe -.00001 G or smaller) from the edge of the visible universe? By edge of the visible universe, I am talking about the region of the cosmic ...
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1answer
253 views
Is nucleosynthesis responsible for the expansion of the universe?
Is it just a coincidence that the two major expansionary periods occur close to periods of nucleosynthesis?
Big Bang nucleosynthesis occurred very close to the inflationary period.
Supernova and ...
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1answer
341 views
TIME TRAVEL-Can it be really done? [closed]
Is it posssible for us to time travel?
Is light essential factor or the dark matter and dark energy?
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1answer
1k views
Can virtual particles be the source of dark matter and dark energy? [closed]
I had this question for a long time. But otherwise the question basically sums the whole thing up.
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144 views
Could dark matter be “inside-out” reality?
Where we are, and in the conventional galaxies etc. that we see, there is a whole lot of relatively uniform space but in isolated places within that space, there are pockets of concentrated "mass" ...
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1answer
134 views
What is dark energy made of? [duplicate]
What are the fundamental constituents of Dark Energy?
Can we quantize dark energy in the first place, if it is a kind of Energy?
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3answers
292 views
Can “dark matter” be the additional mass from the speed of the Galactic Cluster?
Considering that the Earth orbits the Sun at 100 000 km/h and that the Sun orbits the Milky Way at almost 1 000 000 km/h, could it be possible that the galactic cluster orbits some super cluster at ...
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1answer
148 views
What are dark matter and dark energy? [closed]
I've recently read about dark matter and dark energy. But unfortunately, there were not enough answers for me. The article I read was more of a hypothesis than a real answer. So I'm asking for all the ...
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Could blackholes warping space-time create dark energy?
I think the effects of blackholes on the surrounding space is localised to a small area around the blackhole but I wondered if the largest blackholes at the centre of massive clusters could be a ...
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1answer
115 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 ...
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2answers
350 views
Are they talking about the observable universe or the unobservable universe? [closed]
When people say that 95% of the universe is dark matter and dark energy, are they talking about it being in the observable universe or the unobservable universe?
Because surely all matter in the ...
