All Questions
Tagged with dark-energy energy
24
questions
3
votes
1
answer
503
views
Does energy exist on its own? [closed]
So to my understanding as a layman is that energy transfers from one material to another (I guess that's why there's potential and kinetic energy), for example photons to solar panels. Now my question ...
- 149
0
votes
1
answer
112
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Extracting energy from dark energy using springs
So would it be possible to in theory use really giant springs to extract energy from dark energy? So let's say this spring is located outside the local group where dark energy overcomes gravity. So we ...
- 1,544
2
votes
1
answer
73
views
Is it possible in theory to use dark energy to do work?
Discounting the sheer size of the machine you'd need (millions of light years) and the lightspeed delay in operating it. Just the bare question: if dark energy accelerates expansion, is there any ...
- 1,143
0
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0
answers
57
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What is the exact ratio of dark energy to mass?
I need to know the exact ratio between mass and dark energy (total dark energy in the universe / total mass in the universe). I could only find it to 2 decimal points (0.68). I need this to make this ...
1
vote
1
answer
184
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Is it a fact that vacuum energy exists?
I have always read that vacuum energy and zero point energy are established facts of physics supported by various observations of their effects both indirectly and even directly. But I have also read ...
- 2,472
-3
votes
1
answer
153
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Why do some scientists believe that the zero point radiation of the vacuum is incredibly powerful?
I've been doing some research and i read about zero point energy. I've heard that a couple cubic cm of it can boil the earth's oceans. how does this work if the energy is only 2.7 kelvin? and what are ...
user320481
9
votes
4
answers
3k
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Why was more dark energy created during the creation of the Universe than normal energy?
I would like to know if there is an agreed upon explanation within the field of physics as to why more dark energy than normal energy was created during the creation of the Universe.
More is unknown ...
- 478
2
votes
2
answers
168
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Is dark energy (like) normal energy?
I know that the term 'dark' is used because a) dark matter does not interact with light b) we know so little about them. Dark matter I guess could be just an unexplained type of particle we don't know ...
- 2,650
0
votes
1
answer
42
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Infinities of Mass, Energy, & Velocity
My layman's understanding is that photons are particles having 0 mass, which is why they are capable of moving at c (lightspeed). Does our current model of particle physics postulate the existence of ...
2
votes
2
answers
3k
views
Negative energy density
There are some universe models where $\Lambda < 0$. In this case, the energy density of the dark-energy becomes negative. At this point, does it make sense to talk about "negative dark energy ...
- 3,122
1
vote
1
answer
596
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The dimension of potential and kinetic energy of scalar field in Friedmann equation
From the Friedmann equation
$$
H^2=\frac{8\pi G}{3}\rho_m - \frac{kc^2}{a^2} + \frac{\Lambda c^2}{3}.
$$
The dimension of Hubble parameter $H$ is $\frac{1}{\text{time}}$ or $\frac{1}{[T]}$. Therefore, ...
0
votes
1
answer
218
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A layman's question concerning vacuum genesis
I would like to preface this by saying that my knowledge of physics is limited, so I apologize in advance if I confuse any terms.
I recently learned about vacuum genesis and zero-energy hypotheses. ...
- 205
3
votes
4
answers
3k
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Does empty space have energy?
My physics friend suggested that "the answer to why matter exists in the universe" is because all massive particles are just the fabric of space excited into little packets. To illustrate, imagine a ...
- 1,183
10
votes
2
answers
924
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The Redshift of the CMB vs. Dark Energy
The cosmic microwave background (CMB) radiation comprises about 98% of all electromagnetic radiation in the universe. And, from the creation of the CMB to today that electromagnetic radiation has red ...
- 161
-1
votes
1
answer
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Can we in the far future have an energy source made from vacuum energy, antimatter, dark energy, Higgs boson? [closed]
Can we in the far future have an energy source made from vacuum energy, antimatter, dark energy, Higgs boson and all kind of these like stuffs?
- 353