All Questions
Tagged with dark-energy forces
11
questions
12
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1
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1k
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Is there a distance from a gravitational source where the influence of gravity and dark energy are balanced out?
While gravity is a force that attracts
objects with mass, dark energy (or, alternatively, the accelerated expansion of the universe) is not.
However, I have found numerous articles, forums, questions ...
- 2,472
1
vote
2
answers
175
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How does the strength of dark energy compare to the strength of the other forces?
I have read this question:
http://hyperphysics.phy-astr.gsu.edu/hbase/Forces/funfor.html
So , in a nutshell, it is the fitting of data with a specific standard model that organizes the particle ...
- 29k
4
votes
4
answers
462
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With how many Newtons of force is the universe expanding?
The universe is expanding at an accelerating rate. They key word here is "accelerating". Meaning that there is an equivalent "force" (in Newtons) that would cause that same ...
- 1,090
1
vote
1
answer
61
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Why is the energy density of the dark energy component~magnitude as the density of matter now, when the two evolved in different time periods?
WMAP determined that the universe is flat, from which it follows that the mean energy density in the universe is equal to the critical density (within a 0.5% margin of error). This is equivalent to a ...
user318515
0
votes
3
answers
72
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What is the pressure that dark energy exerts on stars and planets while increasing the distance between them?
What is the pressure that dark energy exerts on stars and planets while increasing the distance between them? I can understand that the pressure should be at a volume scales lower than molecules ...
- 1,815
0
votes
1
answer
102
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If gravitational potential energy is negative, why does not it produce any repelling force? [closed]
The gravitational potential energy is usually considered negative. There is even zero-energy universe theory.
If so, why it does not produce any repelling force? Or does it in form of cosmological ...
- 11.2k
2
votes
2
answers
120
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If Casimir vacuum has negative energy, why it is attractive, and not repulsive?
I heard that negative energy should be repulsive. Why Casimir vacuum is attractive then?
Can we explain it by saying Casimir vacuum is electromagnetically attractive but gravitationally repulsive?
- 11.2k
0
votes
1
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81
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What do the terms attractive and repulsive gravity mean in Einstein's GR?
What does the jargon repulsive gravity mean in Einstein's GR or even attractive gravity in the same framework? The notions of attractive and/or repulsive only makes sense, or at least we are ...
- 11.7k
2
votes
2
answers
428
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Shouldn't dark energy be considered a fifth fundamental force?
As everyone knows from the Standard Model, there are 4 fundamental forces that describe the Universe. But isn't the dark energy, the force that makes the universe expand, different from them?
Maybe ...
2
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4
answers
1k
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Does dark energy work like gravity, but the opposite way?
If a body has more mass gravity will exert a greater force on it.
Does that apply also to dark energy? In other words, if a body has more mass, will it be affected more by dark energy? (that is, will ...
- 145
1
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1
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Gravity force and dark energy [duplicate]
If gravity is a fundamental force which bends spacetime and dark energy is energy which stretches spacetime, what is the difference between the terms force and energy?
- 301